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GLOBALSTAR PROPRIETARY AND CONFIDENTIAL INFORMATION
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06/18/20 Subject to Change without Notice P a g e | 48
4.2.2.22 “Send Redundant Burst with GPS” command
This command is used to initiate a redundant bursted message (as setup in STX configuration). Bytes 1 – 6 of the first
packet of the message shall contain latitude and longitude in standard Globalstar 24-bit format. Since each on-air
message must be a multiple of 9 bytes, the message will contain up to 16 9-byte packets depending on the size of the
payload.
Send Redundant Burst with GPS command format
Byte
Bits
Parameter
Description
0
0 - 7
Leader
Always a value of 0xAA.
1
0 - 7
Length
Variable 0x08 – 0x90 (144 bytes)
2
0 - 7
Command Code.
0x33 = Send Redundant Burst with GPS.
3
0 - 7
Byte 0 value
The value to transmit as byte 0 of first packet
4
0 - 7
Byte 7 value
The value to transmit as byte 7 of first packet
5
0 - 7
Byte 8 value
The value to transmit as byte 8 of first packet
6 - n
Additional data
Up to 135 additional bytes of data (16 9 byte
packets). Maximum value of n = 141. If this
number is not divisible by 9, the end of the final
packet of the message will be zero padded.
n+1-
n+2
0 - 15
CRC
Example Command: AA 08 33 AA BB CC 57 C3
Where:
• Payload Byte 0: 0xAA
• Payload Byte 7: 0xBB
• Payload Byte 8: 0xCC
Example Command: AA 11 33 01 02 03 04 05 06 07 08 09 0A 0B 0C C6 8E