LDI DIGISONDE 4D - Housekeeping Packets; BIT Packet Type=0 X05, Payload Length =179 Bytes; Error Message Packet Type=0 X03, Length Is Variable but Not Less than 41; Event Message Packet Type=0 X02, Length Is Variable but Not Less than 41

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
5-48 SECTION 5 - SYSTEM SOFTWARE – ANNEX A
HOUSEKEEPING PACKETS
I’m alive packet TYPE=0x01, Length = 38.
5:113. DESC send this packet to DCART every minute if no science data are being produced.
Table 5A- 28: “I’m Alive” Packet Structure
Byte
Offset
Byte
Len
Mnemonic
Description
Units
Type
Range
0
39
HK_HEAD
ER
Housekeeping Header
-
Table 5A- 16
N/A
Event Message packet TYPE=0x02, Length is variable but not less than 41
5:114. DESC sends this packet to report a detected software condition.
Table 5A- 29: Event Message Packet Structure
Byte
Offset
Byte
Len
Mnemonic
Description
Units
Type
Range
0
39
HK_HEADER
Housekeeping Header
-
Table 5A- 16
N/A
39
2
MESSAGE_ID
Message Ident
-
INT16U
Table A-1
41
1
ITEM_COUNT
Number of auxiliary information items
-
INT8U
0 … 9
42
2 * ITEM_COUNT
AUX_INFO
Auxiliary information items
-
INT16U array
Error message packet TYPE=0x03, Length is variable but not less than 41
5:115. DESC sends this packet to report a detected software error.
Table 5A- 30: Error Message Packet Structure
Byte
Offset
Byte
Len
Mnemonic
Description
Units
Type
Range
0
39
HK_HEADER
Housekeeping Header
-
Table 5A- 16
N/A
39
2
ERROR_ID
Error Ident
-
INT16U
Table A-2
41
1
ITEM_COUNT
Number of auxiliary information items
-
INT8U
0 … 9
42
2 * ITEM_COUNT
ERROR_INFO
Auxiliary information items
-
INT16U array
PROGSCHED Countdown packet TYPE=0x04, Length = 45 bytes
5:116. DESC sends this packet to report upcoming start of a scheduled program or time left for the current
running schedule.
Table 5A- 31: PROGSCHED Countdown Packet Structure
Byte
Offset
Byte
Len
Mnemonic
Description
Units
Type
Range
0
39
HK_HEADER
Housekeeping Header
-
Table 5A- 16
N/A
39
1
SCHD_NUM
Current Schedule Number
-
INT8U
1-255
40
1
PROG_NUM
Upcoming Program Number
0 = use to report time till the end of the
current schedule
-
INT8U
0, 1-255
41
4
TIME_LEFT
Time left until the event
sec
INT32U
0..4G
BIT packet TYPE=0x05, Payload length =179 bytes
5:117. DESC sends the BIT housekeeping packets to report hardware sensor readings. The analysis of sensor
readings for yellow/red high/low tolerance limits is responsibility of the DCART software.