Table of Contents
Advertisement
4.2.1 Serial Packet Format
Preamble
(1 byte)
Preamble
Length
Command
Data
CRC
4.2.2 Serial Packet Command List
For all serial packet commands as described below:
•
AA is the Preamble.
•
NN is the Length.
•
XX is an unspecified byte value
•
CLSB is the least significant CRC byte
•
CMSB is the most significant CRC byte
•
CLSB and CMSB are omitted when using the RAW command. Length must still be specified to include them,
however.
•
If an improperly formatted command is received, the ST100 BOARD will return a NAK response:
4.2.2.1 Send Data (0x00)
The Send Data command requests the ST100 board to send from 1 to 144 data bytes over the Globalstar Simplex
network.
0x00
Leader
AA
Example Command:
AA 0E 00
Use or disclosure of data contained on this sheet is subject to the restrictions in the Distribution Statements on the title page of this
06/18/20
Length
Command
(1 byte)
(1 byte)
Fixed pattern 0xAA
Total number of bytes in the serial packet including the preamble
Command type (See Table 5 Serial Packet Type). Responses to
commands carry the same command type as the command that
initiated the answer
Data associated with the command or answer
16 bit CRC
Figure 4 Serial Packet Format
payload
Len
Cmd
1
XX
NN
00
01 02 03 04 05 06 07 08 09
GLOBALSTAR PROPRIETARY AND CONFIDENTIAL INFORMATION
Subject to Change without Notice
Data
(variable length)
AA 05 FF A1 CB
payload
payload
2
3
XX
XX
BE E8
document.
CRC
(2 bytes)
payload
..
N
CRC1
XX
XX
CLSB
P a g e | 26
CRC2
CMSB
Advertisement
Table of Contents
