Interface Control Document

CIXS/XSM DATA HANDLING ICD

Name Signature
Prepared by
C.J.Howe
Approved by
B J Maddison

DISTRIBUTION

Name
1.0
1-3-06
2
9-11-06
3
27-3-08
4
22-6-09
Iss/Rev
Date
Iss/Rev
Date
Iss/Rev
Date
Iss/Rev
Date
RAL Server x x x x
C. Howe x x x
B. Maddison x x
M. Grande x
B. Kellett x
K. H. Joy
I. A . Crawford x
P. Sreekumar x x x
B. Swinyard
S. Narendranath x
M. Annadurai x x
D. Drummond x x
C. Erd x x

CHANGE RECORD

Date Iss/Rev Section Comments
01/03/2006 1 All Created from S1-CIX-ICD-3002 issue 13.
29/09/2006 2 1 removed reference to EID-B
2.1.1 Packet ID confirmed.
2.1.4 Updated command list
2.2.3 Added s/w parameters
2.3 Updated figure
3.1.1 APID = 1006
3.2.1 Added Data types 10, 11 and 12, deleted types 3 and 7.
3.3.4 Deleted data type
3.3.5 XSM integration time now adjustable using a software parameter.
3.3.7.2 Corrected number of bytes
3.3.8 Deleted data type
3.3.11, 3.3.12, 3.3.13 Sections added for new data types
4
Table 4.2 updated
RESTING mode added
4.2 Data volumes added to the table
5 Data rate added
6 Mass memory figure added
27/03/2008 3 3.3.9, 3.3.10 Revised Aux and Means packet formats for C1XS. (COBS 3.7)
2.1.4.7 Added EMERGENCY_OFF telecommand
2.2 Updated parameter tables
3.3 Corrected HK packet details
22/06/2009 4 1 MSB defined
2.1, 2.1.2 Maximum number of bytes now 48
2.1.4.1 Patch and dump command updated
2.1.4.4 XSM on command added
2.1.4.5 Max event rate command deleted
2.1.4.7
EEP_Prot command description improved.
BB_Cal command deleted
Boot command details and description added
2.2.1 Note added, parameter values updated.
2.2.2 Note added.
2.2.3 Parameter values updated
2.2.5 Parameter values updated
2.2.6 Parameter values updated
3.3.1 Telemetry parameter descriptions updated
3.3.2 Note added
3.3.3 Corrected number of ADC channles used in each bin.
3.3.10 Added notes and table detailing conversion values from type 9 zero data to all other data formats
3.3.11 Changed title to single pixel data
3.3.13 Changed text to indicate that HRLCS mode uses sthe FPGA in single pixel mode.

CONTENTS

1. INTRODUCTION 1

2. COMMANDS 1

2.1 Command Definitions 1

2.1.1 Packet Header 1

2.1.2 Packet Command Data Field 1

2.1.3 Packet Error Control 1

2.1.4 Command Formats 3

2.2 Parameter Tables 20

2.2.1 Table 4 Burr-Brown ADC Parameters 20

2.2.2 Table 5 Detector FPGA Parameters 22

2.2.3 Table 6 Software Parameters 23

2.2.4 Table 7 Analogue HK limits 26

2.2.5 Table 8 noise rejection threshold addition factors 27

2.2.6 Table 9 event threshold addition factors 28

2.3 Command Mode Validity 29

2.4 Time-tagged Command Budget 30

3. TELEMETRY 31

3.1 Source Packet Header 31

3.1.1 Application IDs 31

3.2 Packet Data Field 31

3.2.1 Data Header 31

3.2.2 Data 32

3.2.3 Packet Error Control 32

3.3 Data Formats 33

3.3.1 Data Type 0: Housekeeping Data [APID=1006] 33

3.3.2 Data type 1: C1XS Time-Tagged Events [APID=1006] 41

3.3.3 Data type 2: C1XS Low Count Spectrum [APID=1006] 42

3.3.4 Data type 3: C1XS High Count Spectrum 42

3.3.5 Data types 4 : XSM Data [APID=1006] 42

3.3.6 Data type 5: Memory Dump Data [APID=1006] 43

3.3.7 Data type 6: C1XS Compressed LC Spectrum [APID=1006] 44

3.3.8 Data type 7: C1XS SCD Test 45

3.3.9 Data Type 8: Auxiliary Data [APID=1006] 45

3.3.10 Data Type 9: Auxiliary Data - Smoothed noise zero and thresholds [APID=1006] 48

3.3.11 Data Type 10: Time Tagged, single pixel data [APID=1006] 50

3.3.12 Data Type 11: Time Tagged, 3 pixel event data [APID=1006] 51

3.3.13 Data Type 12: High resolution Low Count Spectrum [APID=1006] 51

4. MISSION PHASE DATA RATES 53

4.1 Inactive modes 54

4.2 Lunar Observations 54

5. CAN WORD DATA RATE 54

6. EXPERIMENT SPACECRAFT RESOURCE REQUIREMENTS 54

1. INTRODUCTION

The C1XS/XSM command and telemetry data are described.

The data structures for the telemetry and on-board CAN BUS are defined. The different packet sizes and transmission periods which can arise for the different experiment modes/states are listed and cross-referenced with the mission phase.

NOTE: Throughout this document the MSB (most significant bit) is defined as bit 0.

2. COMMANDS

2.1 Command Definitions

A C1XS command packet has the following structure:

Packet
Header
[Sect 2.1.1]
Command Data Field [sect 2.1.2]

Command
Type
Qualifier Register address / Function Data
Further data as required
Max 48 bytes
Packet Error Control
CRC
[sect 2.1.3]
0..........5 6 7 8...9 10.......11 12.... 2 bytes

2.1.1 Packet Header

Length: 6 bytes

Format:

Packet ID Packet sequence control Packet length

Version number
3bits
Type
1 bit
Data Field header Flag
1 bit
Application
Process
11bits
Segmentation Flags
2 bits
Source Sequence Count
14bits
16bits
000 1 0 011 1110 1110 11 Variable Variable

The packet ID is 0x13EE.

2.1.2 Packet Command Data Field

Length: 6 bytes, or longer for patches and table loads.

See section 2.1.4

Command Byte Number Size in bytes Function
6 1 Command type
7 1 Qualifier
8-9 2 Register address / Function
10-11 2 Data
12... N = Maximum 48 further data if required

2.1.3 Packet Error Control

Byte Number Size in bytes Function
12+N,12+N+1 2 A CRC code will be used for error control.

2.1.3.1 CRC 'C' Routine

/*

crc.c - routine to perform CRC check on a block of data. The CRC is the one

commonly used in space systems and processed the most significant

bit first

Calling sequence: crc(buf,len,ocrc) where:

buf is the name of the array holding the data to check

len is the length of the data in 16 bit words

oldcrc is the running total if multiple calls are used

*/

crc(buf,len,oldcrc)

int buf[],len,oldcrc;

{

unsigned i,ax,bx,cx,dx;

bx=oldcrc;

for(i=0;i<len;i++) /* do for each word in buffer */

{

dx=buf[i]; /* fetch word from buffer */

cx=16; /* count of bits */

do{

ax=bx^dx;

dx<<= 1;

bx<<= 1;

if(ax>0x7fff)bx^= 4129;

}while(--cx>0);

}

return(bx);

}

2.1.4 Command Formats

2.1.4.1 System Diagnostics and repair

Name/
Database ID
Command
Type
(decimal)
Qualifier
Address
/Function
Data Further Data
Instrument
Mode
Validity
Description/
Verification
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
DUMMY
X001C
1
Fixed
00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Dummy command which only causes increment of command counter
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
PATCH
X100C 8bytes
X101C 16bytes
X102C 32bytes
X103C 38bytes
2
Page Number
0 - 15,
16 & 17
Patch Address Actual Patch Length Patch Data
Emergency Mode
STANDBY
OPERATING
Patch of processor RAM or EEPROM pages 0 to 15.
A value of 16 or 17 is used to patch the waveform generator memory in either FPGA 1 or 2.
Use fixed length command X100C.....X105C of appropriate size and fill with zeroes as required.
The on-board software 'actual patch length' only to determine how much data is to be loaded.
VERIFICATION:
DUMP from same location
DUMP
X003C
3
Page Number
0 - 15,
16, 17,
32 - 41,
64 - 73
Dump Address Dump Length Not used
Emergency Mode
STANDBY
OPERATING
Dump of
0-15: page of RTX RAM, PROM or EEPROM
16, 17 : WG memory
32-41: Dump RAM table
64-73: Dump EEPROM table
VERIFICATION:
Not applicable
GOTO
X004C
4
Page Number
0 - 15
Goto Address
Fixed
0000h
Not used Emergency Mode
Run on-board software from specified address
VERIFICATION:
Not applicable

2.1.4.2 Operating Mode selection

Name/
Database ID
Command
Type
(decimal)
Qualifier
Address/
Function
Data Further Data
Instrument
Mode Validity
Description/
Verification
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
EMODE
X005C
5
Fixed
00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Force transition to emergency mode
VERIFICATION:
Not applicable
OPERATING
X006C
6
Fixed
00h
Fixed
0000h
Fixed
0000h
Not used STANDBY
Go to Operating Mode
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bit 0-3 =
STANDBY
X007C
7
Fixed
00h
Fixed
0000h
Fixed
0000h
Not used OPERATING
Go to Standby Mode
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bit 0-3 =
DELETED
X008C

2.1.4.3 C1XS Science Data Processing Mode

Name/
Database ID
Command
Type
(decimal)
Qualifier
Address/
Function
Data Further Data
Instrument
Mode Validity
Description
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
SCI_SUBMODE
X009C
9 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Select C1XS Science Submode with
Fixed Time-Tagged Events
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bits 4-7 = 0000
9 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Select C1XS Science Submode with
Low Count Spectra
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bits 4-7 = 0001
9 02h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Submode not used
9 03h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Select C1XS Science Submode with
Autoformat
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bits 4-7 = 00011
9 04h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Select C1XS Science Submode with
Compressed low count spectra
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bits 4-7 = 0100
9 05h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Select C1XS Science Submode with
Time tagged, 3 pixel event data
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bits 4-7 = 0101
9 06h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Select C1XS Science Submode with
Time tagged summed pixel data
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bits 4-7 = 0110
9 07h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Select C1XS Science Submode with
High resolution low count spectra
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bits 4-7 = 0111
9 08h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Select C1XS Science Submode with
Autoformat-2
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
Mode - Byte 25 bits 4-7 = 1000

2.1.4.4 Instrument On/Off Commands

These commands enable the XSM and C1XS instruments to be operated independently

Name/
Database ID
Command
Type
(decimal)
Qualifier
Address/
Function
Data Further Data
Instrument
Mode Validity
Description
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
C1XS_ON
X010C
10 00h
Fixed
0000h
Fixed
0000h
Not used OPERATING
Turns on C1XS instrument
SCD FPGA power and Science TM
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
C1XS_OFF
X011C
11 00h
Fixed
0000h
Fixed
0000h
Not used OPERATING
Turns off C1XS instrument
SCD FPGA power and Science TM
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
XSM_ON
X012C
12 00h
Fixed
0000h
Fixed
0000h
Not used OPERATING
Turns on XSM instrument
12V, 5V and TM
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11
XSM_OFF
X013C
13 00h
Fixed
0000h
Fixed
0000h
Not used OPERATING
Turns off XSM instrument
12V, 5V and TM
VERIFICATION:
HK Packet
TC Accepted - Byte 16 incremented
HK Bytes 56 - 61 = TC bytes 6 -11

2.1.4.5 Processor Commands

Name/
Database ID
Command
Type
(decimal)
Qualifier
Address/
Function
Data
Further
Data
Instrument
Mode Validity
Description
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
RAM_TABLE
X110C 8bytes
X111C 16bytes
X112C 32bytes
X113C 38bytes
14
Table ID
00h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 00h
Load WGA Length Table
Fill with zeroes to fixed length as required
14
Table ID
01h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 01h
Load WGA Vector Table
Fill with zeroes to fixed length as required
14
Table ID
02h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 02h
Load WGA tables Table
Fill with zeroes to fixed length as required
14
Table ID
03h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 03h
Load WGA Registers Table
Fill with zeroes to fixed length as required
14
Table ID
04h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 04h
Load BB registers Table
Fill with zeroes to fixed length as required
14
Table ID
05h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 05h
Load FPGA Table
Fill with zeroes to fixed length as required
14
Table ID
06h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 06h
Load Software Parameter Table
Fill with zeroes to fixed length as required
DELETED
X014C

Name/
Database ID
Command
Type
(decimal)
Qualifier
Address/
Function
Data
Further
Data
Instrument
Mode Validity
Description
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
EEP_TABLE
X110C 8bytes
X111C 16bytes
X112C 32bytes
X113C 38bytes
15
Table ID
00h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 00h
Load WGA Length Table
Fill with zeroes to fixed length as required
15
Table ID
01h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 01h
Load WGA Vector Table
Fill with zeroes to fixed length as required
15
Table ID
02h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 02h
Load WGA tables Table
Fill with zeroes to fixed length as required
15
Table ID
03h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 03h
Load WGA Registers Table
Fill with zeroes to fixed length as required
15
Table ID
04h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 04h
Load BB registers Table [Section 2.2.1]
Fill with zeroes to fixed length as required
15
Table ID
05h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 05h
Load FPGA Table [Section 2.2.2]
Fill with zeroes to fixed length as required
15
Table ID
06h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 06h
Load Software Parameter Table [Section 2.2.3]
Fill with zeroes to fixed length as required
15
Table ID
07h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 07h
Load Analogue HK limits Table [Section 2.2.4]
Fill with zeroes to fixed length as required
15
Table ID
08h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 08h
Load Offset/ADC Transfer Function Table [Section 2.2.5]
Fill with zeroes to fixed length as required
15
Table ID
09h
Address
Offset
Actual
No. of words
Table data
STANDBY
OPERATING
Qualifier = Table ID = 09h
Load Offset Nulling Reference Table [Section 2.2.6]
Fill with zeroes to fixed length as required

Name/
Database ID
Command
Type
(decimal)
Qualifier
Address/
Function
Data
Further
Data
Instrument
Mode Validity
Description
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
CPY_TABLE
X016C
16
Table ID
Fixed
0000h
Fixed
0000h
Not used STANDBY
Copy a parameter table from EEPROM to RAM
Qualifier Byte 7 identifies Table
16 FFh
Fixed
0000h
Fixed
0000h
Not used STANDBY Table ID = FFh Copies ALL tables

2.1.4.6 Radiation Shield Actuator Commands

Name/
Database ID
Command
Type
(decimal)
Qualifier
Address/
Function
Data Further Data
Instrument
Mode Validity
Description
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
C1XS_DOOR
X017
17 00h Maximum Steps Step Size Not used
STANDBY
OPERATING
Full Steps - Ignore tellback - Close
17 20h Maximum Steps Step Size Not used
STANDBY
OPERATING
Full Steps - Ignore tellback - Open
17 40h Maximum Steps Step Size Not used
STANDBY
OPERATING
Full Steps - Observe tellback - Close
17 60h Maximum Steps Step Size Not used
STANDBY
OPERATING
Full Steps - Observe tellback - Open
17 80h Maximum Steps Step Size Not used
STANDBY
OPERATING
Half Steps - Ignore tellback - Close
17 A0h Maximum Steps Step Size Not used
STANDBY
OPERATING
Half Steps - Ignore tellback - Open
17 C0h Maximum Steps Step Size Not used
STANDBY
OPERATING
Half Steps - Observe tellback - Close
17 E0h Maximum Steps Step Size Not used
STANDBY
OPERATING
Half Steps - Observe tellback - Open
XSM_SHUTR
X018C
18
Fixed
00h
Fixed
0000h
Fixed
0000h
Not used STANDBY OPERATING Close XSM Shutter
18
Fixed
01h
Fixed
0000h
Fixed
0000h
Not used STANDBY OPERATING Open XSM Shutter
OPEN_LATCH
X019C
19
Fixed
00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
Open C1XS Radiation Pin-Puller Latch
ENBL_LATCH
X020C
20
Fixed
D6h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
Enable C1XS Radiation Pin-Puller Latch Circuit
20
Fixed
00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
Disable C1XS Radiation Pin-Puller Latch Circuit

2.1.4.7 Direct Commands

**********THESE COMMANDS ARE FOR EMERGENCY DIAGNOSTIC USE ONLY********

Name
Command
Type
(decimal)
Qualifier
Address/
Function
Data Further Data
Instrument
Mode Validity
Description
Byte 6 Byte 7 Bytes 8-9 Bytes 10-11 Bytes 12 ...
XSM_DATA
X021C
21 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
STOP acquisition of XSM data
21 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
START acquisition of XSM data
SET_PELTIER
X022C
22 00h
Fixed
0000h
data Not used
STANDBY
OPERATING
Set target temperature for Peltier cooler
ENBL_BIAS
X023C
23 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Disable the XSM HV bias
23 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Enable the XSM HV bias
PELTIER_PWR
X024C
24 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Switch Peltier cooler OFF
24 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Switch Peltier cooler ON
BIAS_OVERRIDE
X025C
25 00h
Fixed
0000h
data Not used
STANDBY
OPERATING
Load pattern in XSM bias override register
XSM_THRES
X026C
26 00h
Fixed
0000h
data Not used
STANDBY
OPERATING
Set threshold for XSM photon events
XSM_12V
X027C
27 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
XSM 12V power OFF
27 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
XSM 12V power ON
SCD_BANK1
X028C
28 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
C1XS SCD Bank 1 OFF
28 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
C1XS SCD Bank 1 ON
SCD_BANK2
X029C
29 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
C1XS SCD Bank 2 OFF
29 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
C1XS SCD Bank 2 ON
WGA_COMMAND
X030C
30 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
STOP SCD Readout Waveform Generator
30 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
START SCD Readout Waveform Generator
LOAD_FPGA
X031C
31 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Load SCD FPGA device from table
LOAD_3D+
X032C
32 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Load SCD 3D+ device from table
LOAD_WGA
X033C
33 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
Load SCD WGA device from table and start it running
CKSUM
X034C
34
Page
00-0Fh
Address
Length
in words 		Not used STANDBY Calculate checksum over memory area given
EEP_PROT
X035C
35 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
Disable EEPROM writing
35 01h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
Enable EEPROM writing. Note that the EEPROM must be enabled for reading too.
35 02h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
Disable EEPROM completely
35 03h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
Enable EEPROM for reading.
DELETED
X036C
36
XSM_ANL_ON
X037C
37 00h
Fixed
0000h
Fixed
0000h
Not used OPERATING XSM Annealing ON
XSM_ANL_OFF
X038C
38 00h
Fixed
0000h
Fixed
0000h
Not used OPERATING XSM Annealing OFF
DELETED
X039C
DELETED
X040C
DELETED
X041C
XSM_CALIB
X042C
42 00h
Fixed
0000h
Fixed
0000h
Not used STANDBY XSM Calibration
BOOT
X043C
43
Page Number
0 - 15
Address
Fixed
0000h
Not used Emergency Mode
Run on-board software from specified address having first checked the checksum over the image. If the checksum is correct then run the software otherwise increment the page number and try a checksum over that page's software. If the checksum on the second page fails remain in Emergency Mode.
VERIFICATION:
Not applicable
EMERGENCY
_OFF
X044C
44 00h
Fixed
0000h
Fixed
0000h
Not used
STANDBY
OPERATING
RESTING
Emergency shut down command

2.2 Parameter Tables

2.2.1 Table 4 Burr-Brown ADC Parameters

Note the actual values being used by the software are given in the Type 8 telemetry packet.

0x0, /* 00 Bank1 chan A-C configuration */

0x2d0, /* 01 Bank1 chan A Det 0 offset */

0x2d0, /* 02 Bank1 chan B Det 4 offset */

0x2a1, /* 03 Bank1 chan C Det 8 offset */

0x00, /* 04 Bank1 chan A Det 0 Det 0 gain */

0x00, /* 05 Bank1 chan B Det 4 Det 0 gain */

0x00, /* 06 Bank1 chan C Det 8 Det 0 gain */

0x0, /* 07 Bank1 chan D-F configuration */

0x2d0, /* 08 Bank1 chan D Det 1 offset */

0x2d0, /* 09 Bank1 chan E Det 5 offset */

0x2a1, /* 0A Bank1 chan F Det 9 offset */

0x00, /* 0B Bank1 chan D Det 1 Det 0 gain */

0x00, /* 0C Bank1 chan E Det 5 Det 0 gain */

0x00, /* 0D Bank1 chan F Det 9 Det 0 gain */

0x0, /* 0E Bank1 chan G-I configuration */

0x2e0, /* 0F Bank1 chan G Det 2 offset */

0x2e0, /* 10 Bank1 chan H Det 6 offset */

0x2d0, /* 11 Bank1 chan I Det 10 offset */

0x00, /* 12 Bank1 chan G Det 2 gain */

0x00, /* 13 Bank1 chan H Det 6 gain */

0x00, /* 14 Bank1 chan I Det 10 gain */

0x0, /* 15 Bank1 chan J-L configuration */

0x2d0, /* 16 Bank1 chan J Det 3 offset */

0x2d0, /* 17 Bank1 chan K Det 7 offset */

0x2b7, /* 18 Bank1 chan L Det 11 offset */

0x00, /* 19 Bank1 chan J Det 3 gain */

0x00, /* 1A Bank1 chan K Det 7 gain */

0x00, /* 1B Bank1 chan L Det 11 gain */

0x0, /* 1C Bank2 chan A-C configuration */

0x2c0, /* 1D Bank2 chan A Det 12 offset */

0x2c0, /* 1E Bank2 chan B Det 16 offset */

0x2c0, /* 1F Bank2 chan C Det 20 offset */

0x00, /* 20 Bank2 chan A Det 12 gain */

0x00, /* 21 Bank2 chan B Det 16 gain */

0x00, /* 22 Bank2 chan C Det 20 gain */

0x0, /* 23 Bank2 chan D-F configuration */

0x2c0, /* 24 Bank2 chan D Det 13 offset */

0x2a7, /* 25 Bank2 chan E Det 17 offset */

0x2c0, /* 26 Bank2 chan F Det 21 offset */

0x00, /* 27 Bank2 chan D Det 13 gain */

0x00, /* 28 Bank2 chan E Det 17 gain */

0x00, /* 29 Bank2 chan F Det 21 gain */

0x0, /* 2A Bank2 chan G-I configuration */

0x291, /* 2B Bank2 chan G Det 14 offset */

0x291, /* 2C Bank2 chan H Det 18 offset */

0x291, /* 2D Bank2 chan I Det 22 offset */

0x00, /* 2E Bank2 chan G Det 14 gain */

0x00, /* 2F Bank2 chan H Det 18 gain */

0x00, /* 30 Bank2 chan I Det 22 gain */

0x0, /* 31 Bank2 chan J-L configuration */

0x2c0, /* 32 Bank2 chan J Det 15 offset */

0x2c0, /* 33 Bank2 chan K Det 19 offset */

0x2c0, /* 34 Bank2 chan L Det 23 offset */

0x00, /* 35 Bank2 chan J Det 15 gain */

0x00, /* 36 Bank2 chan K Det 19 gain */

0x00 /* 37 Bank2 chan L Det 23 gain */

2.2.2 Table 5 Detector FPGA Parameters

The figures given below are the default values on transition to operating mode, the software then recalculates these limits based upon the position of the 'zero energy' peak. The thresholds being used by the software are given in the Type 9 telemetry packet and the other information in the type 8 packet.

900, /* 00 00 Bank1 channel A high threshold */

900, /* 01 01 Bank1 channel B high threshold */

900, /* 02 02 Bank1 channel C high threshold */

900, /* 03 03 Bank1 channel D high threshold */

900, /* 04 04 Bank1 channel E high threshold */

900, /* 05 05 Bank1 channel F high threshold */

900, /* 06 06 Bank1 channel G high threshold */

900, /* 07 07 Bank1 channel H high threshold */

900, /* 08 08 Bank1 channel I high threshold */

900, /* 09 09 Bank1 channel J high threshold */

900, /* 10 0A Bank1 channel K high threshold */

900, /* 11 0B Bank1 channel L high threshold */

800, /* 12 0C Bank1 channel A low threshold */

800, /* 13 0D Bank1 channel B low threshold */

800, /* 14 0E Bank1 channel C low threshold */

800, /* 15 0F Bank1 channel D low threshold */

800, /* 16 10 Bank1 channel E low threshold */

800, /* 17 11 Bank1 channel F low threshold */

800, /* 18 12 Bank1 channel G low threshold */

800, /* 19 13 Bank1 channel H low threshold */

800, /* 20 14 Bank1 channel I low threshold */

800, /* 21 15 Bank1 channel J low threshold */

800, /* 22 16 Bank1 channel K low threshold */

800, /* 23 17 Bank1 channel L low threshold */

0x3f00, /* 24 18 Bank1 event reject level */

0x0007, /* 25 19 Bank1 discriminator mode - use 1st 3 samples */

-1, /* 26 1A Bank1 Data for Burr-Brown register write */

0x0067, /* 27 1B Bank1 OD DAC 72->67 *v2.1*/

0x008A, /* 28 1C Bank1 RD DAC 62->8A *v2.1*/

0x07, /* 29 1D Bank1 power control (all on) 0xF->7 *v1.9*/

900, /* 30 1E Bank2 channel A high threshold */

900, /* 31 1F Bank2 channel B high threshold */

900, /* 32 20 Bank2 channel C high threshold */

900, /* 33 21 Bank2 channel D high threshold */

900, /* 34 22 Bank2 channel E high threshold */

900, /* 35 23 Bank2 channel F high threshold */

900, /* 36 24 Bank2 channel G high threshold */

900, /* 37 25 Bank2 channel H high threshold */

900, /* 38 26 Bank2 channel I high threshold */

900, /* 39 27 Bank2 channel J high threshold */

900, /* 40 28 Bank2 channel K high threshold */

900, /* 41 29 Bank2 channel L high threshold */

800, /* 42 2A Bank2 channel A low threshold */

800, /* 43 2B Bank2 channel B low threshold */

800, /* 44 2C Bank2 channel C low threshold */

800, /* 45 2D Bank2 channel D low threshold */

800, /* 46 2E Bank2 channel E low threshold */

800, /* 47 2F Bank2 channel F low threshold */

800, /* 48 30 Bank2 channel G low threshold */

800, /* 49 31 Bank2 channel H low threshold */

800, /* 50 32 Bank2 channel I low threshold */

800, /* 51 33 Bank2 channel J low threshold */

800, /* 52 34 Bank2 channel K low threshold */

800, /* 53 35 Bank2 channel L low threshold */

0x3f00, /* 54 36 Bank2 event reject level */

0x0007, /* 55 37 Bank2 discriminator mode use last 3 smpls */

-1, /* 56 38 Bank2 data for Burr-Brown register write */

0x00c5, /* 57 39 Bank2 Output gate 9d->c5 *v2.1*/

0x0076, /* 58 3A Bank2 Substrate d0-> 76 *v2.1*/

0x07 /* 59 3B Bank2 power control (all on) 0xF->7 *v1.9*/

2.2.3 Table 6 Software Parameters

3, /* 00 HK packet gen interval 3-> every 64s */

4, /* 01 activation period for latch heater in seconds */

0x6940, /* 02 Software options flags: 6900->6940 (ISRO time) *v3.4*/

/* bit 15 1-> enable test CAN pkts 0 -> disable */

/* bit 14 1-> CRC in TM, 0-> no CRC in TM */

/* bit 13 1-> use XSM in sci mode 0-> no XSM */

/* bit 12 1-> keep XSM shtr closed until open TC 230902 */

/* bit 11 1-> do XSM cal 0-> no XSM calibration */

/* bit 10 1-> switch off XSM after anneal 0-> restart */

/* bit 09 1-> enable BB_CAL at start up */

/* bit 08 1-> enable servo for SS/OG/RD/OD DACs */

/* bit 07 1-> use alternate WGA table */

/* bit 06 1-> expect ISRO-format time distribution *v2.0*/

8, /* 03 integration time/s for C1XS spectra */

180, /* 04 max event count for time tagged format */

150, /* 05 min event count to stay in lunar spectrum fmt */

0, /* 06 SCD1 detectors to omit from spectra Det0 in bit 0 */

0, /* 07 SCD2 detectors to omit from spectra Det 12 in bit 0 */

1024, /* 08 Total event count threshold for disabling detectors */

17000, /* 09 limit for change in rad_mon5 (v.high) 17000 impos.*v3.4*/

17000, /* 10 limit for change in rad_mod4 (high) 1700 impos. *v3.4*/

0x400, /* 11 number of (half) steps for autonomous door movement */

0x1403, /* 12 stepsize,flags for autonomous door movements */

0x1400, /* 13 target stepsize, decrement, for auton. door mv */

32, /* 14 Delay from offset cal to detector check */

0x0, /* 15 Patch ID - included when patches added in EEPROM */

0x07, /* 16 pixel select bits for non-summing processing 1->7 *v2.1*/

0x12, /* 17 pixel select bits for summed processing 17->12 *v3.1*/

0xffff, /* 18 Min. number of minutes to keep door shut */

256, /* 19 Interval, in seconds at which to adjust thresholds */

5298, /* 20 SS monitor target ADC reading (1.6V) */

4960, /* 21 OG monitor target ADC reading () */

7140, /* 22 RD monitor target ADC reading () */

4814, /* 23 OD monitor target ADC reading () */

20, /* 24 SS monitor tolerance (6.1mV) */

8, /* 25 OG monitor tolerance (2.44mV) */

32, /* 26 RD monitor tolerance (9.8mV) */

80, /* 27 OD monitor tolerance (24.4mV */

800, /* 28 Uppr lmt at which switch from Summed TT to HR Spect */

740, /* 29 Lowr lmt at which switch from HR Spect to Summed TT */

320, /* 30 Uppr lmt at which switch from NS TT to Summed TT */

280, /* 31 Lowr lmt at which switch from Summed TT to NS TT */

120, /* 32 XSM default Peltier Target Tempr DAC o/p (-15C) *v3.5*/

24, /* 33 XSM default Discriminator Threshold (.5V) */

35, /* 34 XSM max. det tempr to keep HV bias on (0 deg C) */

4, /* 35 XSM total count thres. for spectrum transmission */

9, /* 36 XSM delta lkge crrnt thres. to anneal (7.2pA) */

16, /* 37 XSM max expctd lkge currnt at end calib (12.8pA) */

60, /* 38 XSM leakage current settling time in seconds */

2, /* 39 XSM number shutter pulses for autonomous activation */

41, /* 40 XSM max safe PIN tempr for bias switch-on (-2C) */

400, /* 41 XSM calibration integration time in seconds */

3, /* 42 XSM number of times to try shuttr open/close2->3 *v3.0*/

7, /* 43 XSM Delta Lkge crrnt in no annealing case (5.4pA) */

2, /* 44 XSM margin for excess lkge crrnt in calib (1.6pA) */

18000, /* 45 XSM annealing period in seconds 16->18000 */

128, /* 46 XSM leakge currnt settling time(s) for annealing */

0, /* 47 XSM spare */

1, /* 48 increment for shut-door integrator */

3, /* 49 decrement for shut-door integrator */

3, /* 50 limit for shut-door integrator */

6048, /* 51 Start-rest temperature (-5C) */

6290, /* 52 end-rest temperature (-8C) */

16, /* 53 integration period for XSM spectra */

17000, /* 54 limit for change in rad_mon3(medium) 17000 impos.*v3.4*/

0x0a72, /* 55 variable HK entry */

0x0, /* 56 ITL ID (set by ground command) */

0x0, /* 57 Boot page (for EEPROM boots, patched with page */

120, /* 58 POT reading below which door considered closed *v3.5*/

4000, /* 59 POT reading above which door considered open *v3.5*/

5, /* Value to write to SCD reg 29 after 3D+ power up */

2.2.4 Table 7 Analogue HK limits

Parameter Lower Upper Action
00 XSM prm 0: PSU_TEMP -32767 32767 None
02 XSM prm 1: +12 volt monitor -32767 32767 None
04 XSM prm 2: -12 volt monitor -32767 32767 None
06 XSM prm 3: PIN detector temperature -32767 32767 None
08 XSM prm 4: Detector box temperature -32767 32767 None
0A XSM prm 5: HV bias voltage -32767 32767 None
0C XSM prm 6: Leakage current -32767 32767 None
0E XSM prm 7: not used -32767 32767 None
10 prm 0: PSU_TEMP - glued to ART2812 -32767 32767 None
12 prm 1: CAN_TEMP - on CAN card -32767 32767 None
14 prm 2: -Yplate_TEMP - backplane face 2862 32767 Go to STANDBY Mode
16 prm 3: VIDEO_TEMP - digital video tempr -32767 32767 None
18 prm 4: VIDEO1_TEMP - 3D+ bank 1 tempr 1165 32767 Go to STANDBY Mode
1A prm 5: VIDEO2_TEMP - 3D+ bank 2 tempr 1165 32767 Go to STANDBY Mode
1C prm 6: SCD1_TEMP - SCD column B tempr 2862 32767 Go to STANDBY Mode
1E prm 7: SCD2_TEMP - SCD column E tempr 2862 32767 Go to STANDBY Mode
20 prm 8: 12V - 12 volt rail voltage -32767 32767 None
22 prm 9: 5V - 5 volt rail voltage -32767 32767 None
24 prm 10: 3.3V - 3.3 volt rail voltage -32767 32767 None
26 prm 11: PELTIER_V - Peltier supply volts -32767 32767 None
28 prm 12: -12V - -12 volt rail voltage -32767 32767 None
2A prm 13: -5V - -5 volt rail voltage -32767 32767 None
2C prm 14: MTR_P1 - motor phase 1 voltage -32767 32767 None
2E prm 15: MTR_P2 - motor phase 2 voltage -32767 32767 None
30 prm 16: SS_VMON - SCD substrate voltage -32767 32767 None
32 prm 17: OG_VMON - SCD o/p gate voltage -32767 32767 None
34 prm 18: RSTD_VMON - SCD reset drain volts -32767 32767 None
36 prm 19: OPD_VMON - SCD o/p drain voltage -32767 32767 None
38 prm 20: 32V_MON - 32 V supply voltage -32767 32767 None
3A prm 21: 0V - spare input connected to 0V -32767 32767 None
3C prm 22: DOOR_POSN - analogue door posn -32767 32767 None
3E prm 23: RAD_MON_1 very low gain -32767 32767 None
40 prm 24: RAD_MON_2 low gain -32767 32767
42 prm 25: RAD_MON_3 med. gain -32767 32767
44 prm 26: RAD_MON_4 high gain -32767 32767
46 prm 27: RAD_MON_+12V RAD mon 12V mon 3000 32767 Reset current trip
48 prm 28: RAD_MON 5 very high gain -32767 32767

2.2.5 Table 8 noise rejection threshold addition factors

det 00 176
det 01 200
det 02 180
det 03 200
det 04 176
det 05 200
det 06 200
det 07 200
det 08 200
det 09 200
det 10 200
det 11 200
det 12 169
det 13 200
det 14 200
det 15 180
det 16 180
det 17 200
det 18 200
det 19 200
det 20 124
det 21 200
det 22 132
det 23 152

2.2.6 Table 9 event threshold addition factors

det 00 264
det 01 300
det 02 270
det 03 300
det 04 264
det 05 300
det 06 300
det 07 300
det 08 300
det 09 300
det 10 300
det 11 300
det 12 253
det 13 300
det 14 300
det 15 270
det 16 270
det 17 300
det 18 300
det 19 300
det 20 186
det 21 300
det 22 198
det 23 227

2.3 Command Mode Validity

The instrument modes are shown below with each box containing the valid commands and the linking arrows the mode transition commands. The commands are identified by Type no and Name.

Instrument Modes

2.4 Time-tagged Command Budget

All commands are 14bytes long which includes 6 bytes command and 8 bytes PUS packet header and CRC.

In the event of anomalous operations requiring a memory patch the command length will be longer.

Based on the Smart-1 DCIXS experience the number of commands per orbit will be approximately 20.

3. TELEMETRY

The data is formatted as follows:

Header
[Sect 3.1]
Telemetry Data Field [sect 3.2]
Packet Time
[sect 3.2.1]
Data Type
[sect 3.2.1]
Data
[sect3.3]
Packet Error Control
CRC
[sect 3.2.3]
0..........5 6.........11 12 13....271 278, 279

3.1 Source Packet Header

Length: 6 bytes

Format:

Packet ID Packet sequence control Packet length

Version number
3bits
Type
1 bit
Data Field header Flag
1 bit
Application
Process APID
11bits
Segmentation Flags
2 bits
Source Sequence Count
14bits
16bits
000 0 0 0x3EE 11 Variable Variable

3.1.1 Application IDs

APID Data Formats
0x3EE
1006
Housekeeping, Science data packets, Auxiliary Data, and memory dump.

3.2 Packet Data Field

C1XS packets are of fixed length with a modified data header for compatibility with existing EGSE.

Data Field Length: 274 bytes.

Sub Fields: Data header: 7 bytes

Data: 265 bytes

Checksum: 2 bytes

3.2.1 Data Header

Length: 7 bytes

Format:

Packet Time 6 bytes
Data Type 1 byte

Time definition:

Spacecraft Time in Seconds (4bytes) 1/65536 sec units (2bytes)

Data Type definition:

Value Data Type
0 Housekeeping
1 C1XS Time tagged events
2 C1XS Low Count Spectrum
3 not used
4 XSM sensor
5 Memory Dump
6 C1XS Compressed Low Count Spectrum
7 not used
8 C1XS Auxiliary Data
9 C1XS Auxiliary Data - Detector Means
10 C1XS Time tagged events
11 C1XS Time tagged, 3 pixel event data
12 C1XS High resolution Low Count Spectrum

3.2.2 Data

Length: 265 bytes

C1XS system has 6 possible data gathering states each with a different data packet format; data types 1, 2, 6, 10, 11 and 12.

The XSM system has one format (type 4).

3.2.3 Packet Error Control

Length: 2 bytes

A CRC code or checksum will be used for error control.

3.3 Data Formats

3.3.1 Data Type 0: Housekeeping Data [APID=1006]

The housekeeping data is collected and transmitted every 64s.

The experiment housekeeping packet will be of standard length and of the following form.

Start Byte Length Bit ID Comment/Calibration
Header 0 6 Header
6 6 Packet Time
12 1 Data Type
13 1 HK Packet Count
Software Status 14 1 TC error flags
15 1 Software Version
16 1 TCs Accepted Count
17 1 TCs rejected Count
18 1 TC Error Code
19 1 Software Flags, low byte
0 XSM processing
1 DCIXS processing
2 Door radiation status
3 Door radiation movement
4 XSM shutter status
5 XSM entering annealing
6 XSM on for >1s
7 XSM switched on
20 2 Received CRC from last TC packet with bad CRC
22 2 Calculated CRC from last TC packet with bad CRC
24 1 Door State
25 0 - 3
Mode
0: Standby
1: Operating
2: Test
3: Calibrate
4: Resting
25 4-7
Submode
0: Time_tagged (DCIXS mode)
1: Low count Spectrum
2: not used
3: DCIXS automatic mode
4: Compressed
5: Time tagged, 3 pixel
6: Time tagged
7: High resolution low count spectrum
8: C1XS auto mode
26 2 Max CAN packets in Output queue this HK period
28 2 Last calculated time adjustment (MS)
30 2 Last calculated time adjustment (NMS)
32 2 Last calculated time adjustment (LS)
34 2 Worst background elapsed time this HK period
36 2 Worst idle loop count this HK period
38 2 Count of times CAN TX not ready
40 2 Count of lost TM PUS packets
42 1 Return Stack pointer
43 1 Parameter stack pointer
44 2 EEPROM write retries
46 2 EEPROM write failures
48 4 Seconds remaining of minimum door closed interval
52 1 Software flags, high byte
0 Not used
1 Not used
2 Not used
3 Not used
4 XSM Cal sequence
5 XSM annealing heater
6 TC XSM anneal start Rxd
7 TC XSM anneal stop Rxd
53 1 Door close integrator count.
54 2 Seconds since last calibration.
56 1 Last TC Type
57 1 Last TC qualifier
58 2 Last TC Address/function
60 2 Last TC first data word
62 1 Last but 1 TC Type
63 1 Last but 1 TC qualifier
64 2 Last but 1 TC Address/function
66 2 Last but 1 TC first data word
C1XS Detector Status 68 1 Sensor 16-23 inhibit '1' = inhibit '0' = enabled
69 1 Sensor 8-15 inhibit '1' = inhibit '0' = enabled
70 1 Sensor 0-7 inhibit '1' = inhibit '0' = enabled
71 1 Power monitor
72 2 BANK 1 Channel A Event Count
74 2 BANK 1 Channel B Event Count
76 2 BANK 1 Channel C Event Count
78 2 BANK 1 Channel D Event Count
80 2 BANK 1 Channel E Event Count
82 2 BANK 1 Channel F Event Count
84 2 BANK 1 Channel G Event Count
86 2 BANK 1 Channel H Event Count
88 2 BANK 1 Channel I Event Count
90 2 BANK 1 Channel J Event Count
92 2 BANK 1 Channel K Event Count
94 2 BANK 1 Channel L Event Count
96 2 BANK 2 Channel A Event Count
98 2 BANK 2 Channel B Event Count
100 2 BANK 2 Channel C Event Count
102 2 BANK 2 Channel D Event Count
104 2 BANK 2 Channel E Event Count
106 2 BANK 2 Channel F Event Count
108 2 BANK 2 Channel G Event Count
110 2 BANK 2 Channel H Event Count
112 2 BANK 2 Channel I Event Count
114 2 BANK 2 Channel J Event Count
116 2 BANK 2 Channel K Event Count
118 2 BANK 2 Channel L Event Count
XSM Analogue HK 120 2 XSM +5V monitor Volts = Count *10/256
122 2 XSM +12V monitor Volts = Count *14.968/255
124 2 XSM -12V monitor Volts = -(Count +1.606)/20.08
126 2 XSM PIN detector temperature Temp C = - Count*0.21875
128 2 XSM Detector Box temperature Temp C = Count * 3.90625 - 273
130 2 XSM HV Bias Voltage Volts = Count *1.5625
132 2 XSM Leakage Current pA = Count * 0.78125
C1XS Analogue HK 134 2 DC Converter Temperature See section 3.3.1.1
136 2 CAN/HK PCB Temperature See section 3.3.1.1
138 2 -Y plate Temperature See section 3.3.1.1
140 2 Video Digital PCB temperature See section 3.3.1.1
142 2 VIDEO1 3D+ temperature See section 3.3.1.1
144 2 VIDEO2 3D+ temperature See section 3.3.1.1
146 2 SCD column B temperature See section 3.3.1.1
148 2 SCD column E temperature See section 3.3.1.1
150 2 12V regulated supply Volts = Count * 5.525*0.0003052
152 2 5V regulated supply Volts = Count * 2.361*0.0003052
154 2 3.3V regulated supply Volts = Count * 2*0.0003052
156 2 XSM Peltier supply voltage Volts = Count *0.0003052
158 2 -12V regulated supply Volts = - (65536-Count) * 5.525*0.0003052
160 2 -5V regulated supply Volts = - (65536-Count ) * 2.361*0.0003052
162 2 Motor Phase 1 voltage
164 2 Motor Phase 2 voltage
166 2 SCD Substrate Voltage Monitor [SS_VMON] Volts = Count * 5.545*0.0003052
168 2 SCD Output Gate Voltage Monitor [OG_VMON] Volts = Count * 2*0.0003052
170 2 SCD Reset Drain Voltage Monitor [RSTD_VMON] Volts = Count * 7.818*0.0003052
172 2 SCD Output Drain Voltage Monitor [OPD_VMON] Volts = Count * 20.545*0.0003052
174 2 39V supply voltage [39V_VMON] Volts = Count * 20.545*0.0003052
176 2 0V
178 1 Door Mechanism Status
bit 0 not used
bit 1 Launch Lock Latch Enabled '1' = enabled
bit 2 Launch Lock Bypass Enabled '1' = enabled
bit 3 Launch Lock Latch Open = 1 [SW1] '1' = true
bit 4 Launch Lock Latch Closed = 1 [SW2] '1' = true
bit 5 Door Motor Running '1' = true
bit 6 Not used
bit 7 Not used
179 1 Spare
180 2 Door Motor Step Count
182 1 XSM Control Status
bit 0 MSB Not used
bit 1 Not used
bit 2 Peltier On/Off 1 = On 0 = Off
bit 3 Peltier mode heat/cool 1 = Heat 0 = Cool
bit 4 Shutter mode 1 = Open 0 = Closed
bit 5 HV Bias on/off : 1= on 0 = off
bit 6 HV Override Enable: '1' = enabled '0' = Disabled
bit 7 LSB FIFO write Enable: '1' = enabled '0' = Disabled
183 1 XSM Status
bit 0 MSB Not used
bit 1 Not used
bit 2 Not used
bit 3 Not used
bit 4 Not used
bit 5 Detector Overtemp HV should be switched down
bit 6 HV bias overvoltage HV should be switched down
bit 7 LSB ADC Conversion complete
184 1 XSM DAC 0 (last value written to DAC)
185 1 XSM DAC 1 (last value written to DAC)
186 1 XSM State
188 2 XSM second counter
190 1 Software Patch ID
191 1 Boot Page number
3D+ 192 2 SS DAC Monitor Average
194 2 OG DAC Monitor Average
196 2 RD DAC Monitor Average
198 2 OD DAC Monitor Average
200 1 SS DAC demand
201 1 OG DAC demand
202 1 RD DAC demand
203 1 OD DAC demand
204 2 Spare
206 2 Spare
208 2 Most events/sec this period
210 4 Memory checksums
214 2 Data in address pointed to by table 6 param 55.
216 2 ITL ID table 6 parameter 56.
218 2 Latest XSM Total counts
220 2 Spare
222 2 Spare
224 2 Spare
226 2 XSM Spectra Count
228 2 XSM RICA FIFO port 2 register contents
230 2 XSM RICA FIFO port 3 register contents
232 2 XSM RICA software control register contents
234 4 XSM_FIFO_ERR1
238 4 XSM_FIFO_ERR2
242 2 HK_DOOR_POSN
244 2 HK_RAD_MON_1 Volts = Count * 0.00061
246 2 HK_RAD_MON_2 Volts = Count * 0.00061
248 2 HK_RAD_MON_3 Volts = Count * 0.00061
250 2 HK_RAD_MON_4 Volts = Count * 0.00061
252 2 HK_RAD_MON_12V Volts = Count * 0.001686
254 2 HK_RAD_MON_5 Volts = Count * 0.00061
--- - Spare
278 2 CRC
Total 280

4 C1XS THERMISTOR CALIBRATION

°C Counts
-80 8174
-79 8172
-78 8171
-77 8169
-76 8167
-75 8165
-74 8162
-73 8160
-72 8157
-71 8154
-70 8151
-69 8148
-68 8144
-67 8140
-66 8136
-65 8132
-64 8127
-63 8122
-62 8116
-61 8110
-60 8104
-59 8097
-58 8090
-57 8082
-56 8074
-55 8065
-54 8056
-53 8046
-52 8035
-51 8023
-50 8011
-49 7998
-48 7985
-47 7970
-46 7955
-45 7938
-44 7921
-43 7903
-42 7883
-41 7863
-40 7841
-39 7818
-38 7794
-37 7769
-36 7742
-35 7714
-34 7684
-33 7654
-32 7621
-31 7587
-30 7551
-29 7513
-28 7474
-27 7433
-26 7390
-25 7346
-24 7300
-23 7251
-22 7201
-21 7149
-20 7095
-19 7039
-18 6980
-17 6920
-16 6858
-15 6794
-14 6728
-13 6660
-12 6590
-11 6518
-10 6444
-9 6368
-8 6290
-7 6211
-6 6130
-5 6048
-4 5963
-3 5878
-2 5791
-1 5702
0 5613
1 5522
2 5429
3 5337
4 5243
5 5149
6 5055
7 4959
8 4863
9 4766
10 4670
11 4574
12 4478
13 4381
14 4286
15 4190
16 4095
17 4001
18 3907
19 3814
20 3722
21 3630
22 3540
23 3451
24 3363
25 3276
26 3191
27 3106
28 3023
29 2942
30 2862
31 2783
32 2706
33 2630
34 2557
35 2484
36 2414
37 2344
38 2277
39 2211
40 2146
41 2083
42 2022
43 1962
44 1904
45 1847
46 1792
47 1738
48 1686
49 1635
50 1586
51 1538
52 1491
53 1446
54 1402
55 1359
56 1318
57 1278
58 1239
59 1202
60 1165
61 1129
62 1095
63 1061
64 1030
65 998
66 968
67 938
68 910
69 883
70 856
71 830
72 805
73 781
74 758
75 735
76 713
77 692
78 671
79 652
80 632
81 614
82 596
83 578
84 562
85 545
86 529
87 514
88 499
89 485
90 471
91 458
92 445
93 432
94 420
95 408
96 397
97 385
98 375
99 364
100 354
101 345
102 335
103 326
104 317
105 308
106 300
107 292
108 284
109 277
110 269
111 262
112 255
113 248
114 242
115 236
116 230
117 224
118 218
119 212
120 207
121 201
122 196
123 191
124 187
125 182
126 177
127 173
128 169
129 164
130 160

4.1.1 Data type 1: C1XS Time-Tagged Events [APID=1006]

Each X-ray event detected by any of the 24 detectors is time-tagged and the energy (signal count) measured. These data and the detector channel number are stored for 64 events and transmitted in one packet.

The event times are relative to the Start Time which is the full 6 byte on-board clock time of the first event in the packet.

Relative time is 12 bits split between two bytes and the LS bit = 1/16s

The data gathering time will vary according to event rate.

The longest time before the relative time counter rolls over is 256s

Each X-ray event is a 12 bit number, i.e. 4095 max.

Start Byte.Bit Length ID
0 6 Header
6 6 Packet Time
12 1 Data Type
13 1 Not used
14 4 bytes Event Start Time
18 1 byte Spare
19 1 byte Number of events in packet
20.0 5 bits Detector Channel Number
20.6 3 bits RICA Error Flags
21.0 1 Event Time in seconds
22.0 4 bits Event Time 1/16seconds
22.4 12 bits Detector Signal Count
24.0 5 bits Detector Channel Number
24.6 3 bits RICA Error Flags
25.0 1 Event Time in seconds
26.0 4 bits Event Time 1/16seconds
26.4 12 bits Detector Signal Count
~ ~ ~
272.0 5 bits Detector Channel Number
273.0 3 bits RICA Error Flags
272.6 1 Event Time in seconds
274.0 4 bits Event Time 1/16seconds
274.4 12 bits Detector Signal Count
276 2 bytes Not used
278 2 bytes Checksum

280 Data bytes

4.1.2 Data type 2: C1XS Low Count Spectrum [APID=1006]

Energy spectra are formed from each detector covering the full energy range. The spectrum is formed by grouping 16 adjacent A/D conversion levels to give 256 energy bands.

The maximum expected count in each band is 255

For each integration period which is commandable 24 'type 2' packets will be transmitted 1 packet for each spectrum.

Start Byte Length Parameter
0 6 Header
6 6 Packet Time
12 1 Data Type
13.0 3 bits Not Used
13.3 5 bits Detector Number
14 4 Integration Start time (seconds)
18 2 Not used
20 2 Integration Time (seconds)
22 256 Spectrum data
278 2 Checksum

280 Data bytes

4.1.3 Data type 3: C1XS High Count Spectrum

Packet type not produced by C1XS.

4.1.4 Data types 4 : XSM Data [APID=1006]

A 512 channel spectrum is produced for each integration period of 16s. Each channel is stored in a Shift count and Mantissa Format described below.

Four of the following packets are transmitted per integration:

Integration time accuracy <1/64s

Shift count and Mantissa Format:

This format allows unsigned integers from 0 to 134184960 to be represented in a 16 bit number with and accuracy of no worse than one part in 2048 (~0.05%). the number is represented as a 12 bit mantissa an a 4 bit shift count:

bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Shift count (0-15) Mantissa (0-4095)

The shift count field gives the number of places that the mantissa must be shifted to the left to give the actual value. For numbers in the range 0-4095 the encoded value is the same as the raw value and no precision is lost.

Examples of encoding:

Number In hex shift count Mantissa Encoded value Encoded value (hex) Reconstructed value (hex)
0 0000 0 0 0 0000 0000
4095 0FFF 0 4095 4095 0FFF 0FFF
4096 1000 1 2048 6144 1800 1000
8193 1FFF 1 4095 8193 1FFF 1FFE
32768 8000 4 2048 18432 4800 8000
65535 FFFF 4 4095 20479 4FFF FFF0
1048575 FFFFF 8 4095 36863 8FFF FFF00

For counts of less than 4 million the error introduced by encoding is less than the statistical standard deviation.

Start Byte Length ID
0 6 Header
6 6 Packet Time
12 1 Data Type
13.0 2bits
Bits = 00 : Channels 0 -127
Bits = 01 : Channels 128 -255
Bits = 10 : Channels 256 -383
Bits = 11 : Channels 384 -511
13.2 1bit Not used
13.3 1bit Shutter Open '1' = true
13.4 1bit Shutter Closed '1' = true
13.5 1bit Detector Overtemp HV should be switched down
13.6 1bit HV bias overvoltage HV should be switched down
13.7 1bit ADC Conversion complete
14 4 Integration Start time (seconds )
18 2 Integration Time (seconds)
20 2 Not used
22 256 XSM Spectrum
278 2 Checksum

280 Data bytes

4.1.5 Data type 5: Memory Dump Data [APID=1006]

A memory dump packet is generated in response to a memory dump command. The data field is of standard length:

Start Byte Length ID
0 6 Header
6 6 Packet Time
12 1 Data Type
13 4 Spare
17 1 Page
18 2 Dump Address
20 2 Length
22 256 Memory Dump Data
278 2 Checksum

280 Data bytes

4.1.6 Data type 6: C1XS Compressed LC Spectrum [APID=1006]

The compressed low count spectral format is generated by firstly producing a spectrum for each enabled detector and then concatenating up to 24 spectra for a single integration period before run length encoding the data at byte level.

3.3.7.1 The following table lists the spectral bin widths:

Width Bin Numbers
8 0 to 96
12 97 to 144
16 145 to 176
20 177 to 200
24 201 to 224
32 225 to 244
48 245 to 254
56 255

3.3.7.2 Data format prior to encoding

Each detector shall use a 257 byte structure to contain the detector number and the 255 spectral bins, see following table.

Start Byte Length Parameter
0 1 Detector number
1 1 Spectral bin 0
.
.
.
.
.
.
256 1 Spectral bin 255

3.3.7.3 Description of run length encoding

If two consecutive bytes in the data are the same value then a third byte is added to give the number of times that that value occurs again. e.g.

data stream = 00,05,05,05,a0,b0,00,00,00,00,00,00,ff

is encoded to

rle = 00,05,05,01,a0,b0,00,00,04,ff

3.3.7.4 Telemetry Packet Format

The run length encoded data is packed into a sufficient number of telemetry packets, the telemetry packet fields are shown in the following table.

Start Byte Length Parameter
0 6 Header
6 6 Packet Time
12 1 Data Type
13 1 Integration time (seconds)
14 4 Integration start time (seconds)
18 2
bits 00:06 - Compressed data packet number (lsb is 0)
bits 07:15 - no. bytes of compressed data in pkt
20 258 Compressed spectral data
278 2 Checksum
280 Data bytes

where:

Integration start time = the time current integration period started.

Integration time = Table 6, parameter 53

Compressed data packet number = sequential number commencing at 0 for this set of compressed data.

4.1.7 Data type 7: C1XS SCD Test

Packet type not produced by C1XS.

4.1.8 Data Type 8: Auxiliary Data [APID=1006]

The detector readout electronics configuration parameters are transmitted in this format.

It will be transmitted on transition to operating mode.

The experiment auxiliary packet will be of standard length and of the following form.

Start Byte Length ID
0 6 Header
6 6 Packet Time
12 1 Data Type
13 1 Spare
14 2 SCD 0, 4, 8 configuration
16 2 SCD 0 offset
18 2 SCD 4 offset
20 2 SCD 8 offset
22 2 SCD 0 gain
24 2 SCD 4 gain
26 2 SCD 8 gain
28 2 SCD 1, 5, 9 configuration
30 2 SCD 1 offset
32 2 SCD 5 offset
34 2 SCD 9 offset
36 2 SCD 1 gain
38 2 SCD 5 gain
40 2 SCD 9 gain
42 2 SCD 2, 6, 10 configuration
44 2 SCD 2 offset
46 2 SCD 6 offset
48 2 SCD 10 offset
50 2 SCD 2 gain
52 2 SCD 6 gain
54 2 SCD 10 gain
56 2 SCD 3, 7, 11 configuration
58 2 SCD 3 offset
60 2 SCD 7 offset
62 2 SCD 11 offset
64 2 SCD 3 gain
66 2 SCD 7 gain
68 2 SCD 11 gain
70 2 SCD 12, 16, 20 configuration
72 2 SCD 12 offset
74 2 SCD 16 offset
76 2 SCD 20 offset
78 2 SCD 12 gain
80 2 SCD 16 gain
82 2 SCD 20 gain
84 2 SCD 13, 17, 21 configuration
86 2 SCD 13 offset
88 2 SCD 17 offset
90 2 SCD 21 offset
92 2 SCD 13 gain
94 2 SCD 17 gain
96 2 SCD 21 gain
98 2 SCD 14, 18, 22 configuration
100 2 SCD 14 offset
102 2 SCD 18 offset
104 2 SCD 22 offset
106 2 SCD 14 gain
108 2 SCD 18 gain
110 2 SCD 22 gain
112 2 SCD 15, 19, 23 configuration
114 2 SCD 15 offset
116 2 SCD 19 offset
118 2 SCD 23 offset
120 2 SCD 15 gain
122 2 SCD 19 gain
124 2 SCD 23 gain
126-148 24 Spare
150 2 Bank1 event reject level
152 2 Bank1 pixel processing mode
154 2 Always 0xFFFF
156 2 OD DAC
158 2 RD DAC
160 2 Bank 1 Power control
162 2 Bank2 channel A high threshold
164 2 Bank2 channel B high threshold
166 24 Spare (0)
190 2 Bank2 event reject level
192 2 Bank2 pixel processing mode
194 2 Always 0xFFFF
196 2 OG DAC
198 2 SS DAC
200 2 Bank21 Power control
202 2 Spare
204 2 Spare
206 16 XSM Parameters
222-276 56 Spare (0)
278 2 Checksum
280 Data bytes

4.1.9 Data Type 9: Auxiliary Data - Smoothed noise zero and thresholds [APID=1006]

The detector noise parameters are transmitted in this format. The smoothed noise zero value for each SCD is recorded along with the resulting high and low threshold settings.

It will be transmitted when an threshold adjustment is performed every 256s (nom.).

The smoothed noise zero is given in raw ADC units from the VSP3100. The 14 bit data is limited to a thirteen bit value by and then scaled down by a factor which depends on the data format. The following table shows the scale value for each of the data formats:

Data type Name Scaling
1 DCIXS LC spectra 32
2 DCIXS time tagged 4
3 Not used n/a
6 Compressed LC spectra 16
10 Time tagged, 1 pixel 2
11 Time tagged, 3 pixel 2
12 High resolution LC 8

The scaling figures given for the spectral formats are for the size of the smallest bin in the spectrum.

For example to convert the zero position peak in a high resolution low count spectral packet to the same units as the zero peak value in the type 9 packet then, assuming the peak is in the first 250 bins:

type 9 '0' position = HRLCS '0' position * 16

The packet will be of standard length and of the following form.

Start Byte Length ID
0 6 Header
6 6 Packet Time
12 1 Data Type (=9)
13 1 Not used (=0)
14 2 Detector #0 Smoothed noise-zero
16 2 Detector #1 Smoothed noise-zero
18 2 Detector #2 Smoothed noise-zero
20 2 Detector #3 Smoothed noise-zero
22 2 Detector #4 Smoothed noise-zero
24 2 Detector #5 Smoothed noise-zero
26 2 Detector #6 Smoothed noise-zero
28 2 Detector #7 Smoothed noise-zero
30 2 Detector #8 Smoothed noise-zero
32 2 Detector #9 Smoothed noise-zero
34 2 Detector #10 Smoothed noise-zero
36 2 Detector #11 Smoothed noise-zero
38 2 Detector #12 Smoothed noise-zero
40 2 Detector #13 Smoothed noise-zero
42 2 Detector #14 Smoothed noise-zero
44 2 Detector #15 Smoothed noise-zero
46 2 Detector #16 Smoothed noise-zero
48 2 Detector #17 Smoothed noise-zero
50 2 Detector #18 Smoothed noise-zero
52 2 Detector #19 Smoothed noise-zero
54 2 Detector #20 Smoothed noise-zero
56 2 Detector #21 Smoothed noise-zero
58 2 Detector #22 Smoothed noise-zero
60 2 Detector #23 Smoothed noise-zero
62 2 Detector #0 High Threshold
64 2 Detector #1 High Threshold
66 2 Detector #2 High Threshold
68 2 Detector #3 High Threshold
70 2 Detector #4 High Threshold
72 2 Detector #5 High Threshold
74 2 Detector #6 High Threshold
76 2 Detector #7 High Threshold
78 2 Detector #8 High Threshold
80 2 Detector #9 High Threshold
82 2 Detector #10 High Threshold
84 2 Detector #11 High Threshold
86 2 Detector #12 High Threshold
88 2 Detector #13 High Threshold
90 2 Detector #14 High Threshold
92 2 Detector #15 High Threshold
94 2 Detector #16 High Threshold
96 2 Detector #17 High Threshold
98 2 Detector #18 High Threshold
100 2 Detector #19 High Threshold
102 2 Detector #20 High Threshold
104 2 Detector #21 High Threshold
106 2 Detector #22 High Threshold
108 2 Detector #23 High Threshold
110 2 Detector #0 Low Threshold
112 2 Detector #1 Low Threshold
114 2 Detector #2 Low Threshold
116 2 Detector #3 Low Threshold
118 2 Detector #4 Low Threshold
120 2 Detector #5 Low Threshold
122 2 Detector #6 Low Threshold
124 2 Detector #7 Low Threshold
126 2 Detector #8 Low Threshold
128 2 Detector #9 Low Threshold
130 2 Detector #10 Low Threshold
132 2 Detector #11 Low Threshold
134 2 Detector #12 Low Threshold
136 2 Detector #13 Low Threshold
138 2 Detector #14 Low Threshold
140 2 Detector #15 Low Threshold
142 2 Detector #16 Low Threshold
144 2 Detector #17 Low Threshold
146 2 Detector #18 Low Threshold
148 2 Detector #19 Low Threshold
150 2 Detector #20 Low Threshold
152 2 Detector #21 Low Threshold
154 2 Detector #22 Low Threshold
156 2 Detector #23 Low Threshold
158-176 120 Not used (=0)
278 2 Checksum
280 Data bytes

4.1.10 Data Type 10: Time Tagged, single pixel data [APID=1006]

Each X-ray event detected by any of the 24 detectors is time-tagged and the energy (signal count) measured. These data and the event time (4 bits) are stored for 129 events and transmitted in one telemetry packet for each detector.

The event times are relative to the Start Time which is the full 4 byte on-board clock time of the first event in the packet.

Relative time is 4 bits with the LS bit = 1/2s

The data gathering time will vary according to the event rate.

The longest time before the relative time counter rolls over is 7.5s

Start Byte.Bit Length ID
0 6 Header
6 6 Packet Time
12 1 Data Type
13 1 Detector Number
14 4 bytes Event Start Time
18 1 byte Spare
19 1 byte Number of events in packet
20.0 12 bits Detector Signal Count
21.4 4 bits Event Time 1/2seconds
22.0 12 bits Detector Signal Count
23.4 4 bits Event Time 1/2seconds
~ ~ ~
276.0 12 bits Detector Signal Count
277.4 4 bits Event Time 1/2seconds
278 2 bytes Checksum

280 Data bytes

4.1.11 Data Type 11: Time Tagged, 3 pixel event data [APID=1006]

Each X-ray event detected by any of the 24 detectors is time-tagged and the energy (signal count) measured for the SCD pixel that detected the event and one pixel either side of it. These data and the detector channel number are stored for 51 events and transmitted in one telemetry packet for each detector.

The event times are relative to the Start Time which is the full 4 byte on-board clock time of the first event in the packet.

Relative time is 4 bits with the LS bit = 1/2s

The data gathering time will vary according to event rate.

The longest time before the relative time counter rolls over is 7.5s

Start Byte.Bit Length ID
0 6 Header
6 6 Packet Time
12 1 Data Type
13 1 Detector Number
14 4 bytes Event Start Time
18 1 byte Spare
19 1 byte Number of events in packet
20.0 12 bits Pixel 0 Signal Count
21.4 12 bits Pixel 1 Signal Count
23.0 12 bits Pixel 2 Signal Count
24.4 4 bits Event Time 1/2seconds
25.0 12 bits Pixel 0 Signal Count
26.4 12 bits Pixel 1 Signal Count
28.0 12 bits Pixel 2 Signal Count
29.4 4 bits Event Time 1/2seconds
~ ~ ~
270.0 12 bits Pixel 0 Signal Count
271.4 12 bits Pixel 1 Signal Count
273.0 12 bits Pixel 2 Signal Count
274.4 4 bits Event Time 1/2seconds
275 3 bytes spare
278 2 bytes Checksum

280 Data bytes

4.1.12 Data Type 12: High resolution Low Count Spectrum [APID=1006]

Energy spectra are formed from each detector covering the full energy range, the FPGA mode is set to give a single pixel for each X-ray event. The spectrum is formed by grouping adjacent A/D conversion levels to give 512 energy bins, the number of ADC conversion levels (width) that make up each bin is given in the following table.

Width Bin Numbers
4 0 to 249
8 250 to 387
16 388 to 510
24 511

The maximum expected count in each band is 255

For each integration period which is commandable (>8 secs) 48 'type 12' packets will be transmitted, 2 packets for each spectrum.

Start Byte Length Parameter
0 6 Header
6 6 Packet Time
12 1 Data Type
13.0 1 bit
Flag -
0 : Channels 0 to 255
1 : Channels 256 to 511
13.1 2 bits Not used
13.3 5 bits Detector Number
14 4 Integration Start time (seconds)
18 2 Not used
20 2 Integration Time (seconds)
22 256 Spectrum data
278 2 Checksum

280 Data bytes

5. MISSION PHASE DATA RATES

The instrument has three basic conditions OFF STANDBY and 'Operating' which includes a RESTING mode in addition to the OPERATIONAL mode. In STANDBY and RESTING modes the detectors are not being clocked and the solar monitor peltier coolers are off - hence the power is reduced. The transition between OPERATIONAL and RESTING modes is carried out autonomously by the software dependent on the temperature of the SCD.

The OPERATIONAL mode has 7 submodes which correspond to variations in data collection. The contents of the telemetry packets will vary according to mode and state selected.

The modes/states which are likely to be used in the Spacecraft modes are summarised in Table 4­1.

A detailed breakdown is given in section 4.2 for the active operational detector modes.

Table 4­1 Experiment/Spacecraft Mode Correlation - Data rates

Instrument Mode
Spacecraft Mode
Instrument Data Format
Pre-Launch LEOP Safe De-tumble
Observation
Lunar Nadir Pointing
OFF X X X X X
EMERGENCY Memory dumps by command only X X
STANDBY Housekeeping X X
Auxiliary Data X X
OPERATIONAL C1XS formats X X
XSM X X
Housekeeping X X
Auxiliary Data X X

Table 4­2 Data Format Packet Numbers

Data Type No Data Format Packets /Format
0 Housekeeping 1
1 C1XS Time tagged events 1 = 64 events
2 C1XS Low Count Spectrum 24 = 1 spectrum for each detector
3 Not used
4 XSM sensor 4 = 1 spectrum
5 Memory Dump 1
6 C1XS Compressed Low Count Spectra
24 = 1 spectrum for each detector (poor compression)
10 = 1 spectrum for each detector (typical compression)
7 Not used
8 C1XS Auxiliary Data - 3D+ Gain and Offset 1
9 C1XS Auxiliary Data - FPGA Thresholds 1
10 Time Tagged, summed pixel data
24 = 3096 events
(129 events per detector)
11 Time Tagged, 3 pixel event data
24 = 1224 events
(51 events per detector)
12 High resolution Low Count Spectrum 48 = 1 spectrum for each detector

5.1 Inactive modes

STANDBY mode does not have full data collection from the C1XS or XSM detectors. Only housekeeping data is transmitted as one 280 byte packet every 64s.

5.2 Lunar Observations

The event rate is dependent on the state of the sun and the sun/moon/spacecraft geometry.

The average case is given in the table below.

Observation Data Format Event Rate /s Packet /s Observation Duration (hours) Total Data Packets /orbit Mbits
Lunar Geochemistry C1XS C1XS Time tagged, 3 pixel event data <306 5.1 0.568 10430 23.4
C1XS summed pixel data <774 4.0 0.294 4265 9.6
C1XS High resolution LC spectrum >774 3 0.118 1270 2.8
Solar Monitoring XSM spectrum n/a 0.25 0.98 1763 3.95
AUX packet n/a 0.008 0.98 26 0.06
Housekeeping HK packet n/a 0.016 0.98 55 0.12

Total packets / Mbits per orbit 16050 35.94

6. CAN WORD DATA RATE

CAN BUS Maximum C1XS/XSM Data transfer rate 40kbps

7. EXPERIMENT SPACECRAFT RESOURCE REQUIREMENTS

Mass memory allocation 400Mbits