56ST100 User Manual v1 Confidential & Proprietary Information
8545-0194-01 v1.0
4.3. ST100 BOARD SELF-TEST COMMAND
This command is used to initiate an internal self-test of the ST100 BOARD. When this command is received by the ST100 board,
there will be a 2 - 5 second delay before the response is returned (self-test in progress).
Note that as a binary command to the ASIC, this is specifically a self-test of the ASIC. The following operations are tested:
• A test transmission is sent, testing the transmitter and oscillator operation from end to end.
• The GPS is powered up and checked that it is generating correctly formatted and readable NMEA messages. As the “view of
the sky” cannot be known, only communication to the GPS is tested, not signal strengths.
• The I2C link to the Accelerometer is tested for proper communication to the accelerometer.
• NOTE: If the custom hardware configuration is ordered wherein the accelerometer is connected to the Nordic processor
rather than to the ASIC processor, this portion of the self-test will indicate a fail.
Example Command: AA 06 FD 0E 9A 71
BYTE BITS PARAMETER DESCRIPTION
0 0 - 7 Leader Always a value of 0xAA
1 0 - 7 Length 0x06
2 0 - 7 Command Code 0xFD
3 0 - 7 Sub Command Code 0x0E (Perform Self Test)
4-5 0 - 15 CRC
BYTE BITS PARAMETER DESCRIPTION
0 0 - 7 Leader Always a value of 0xAA
1 0 - 7 Length 0x07
2 0 - 7 Command Code 0xFD
3 0 - 7 Sub Command Code 0x0E (Perform Self-Test)
4 0 - 7 Result Code
The following bit flags indicate a pass or fail of each subsystem.
0x01 = Transmitter (0 = failed 1 = passed)
0x02 = GPS (0 = failed 1 = passed)
0x04 = Accelerometer (0 = failed 1 = passed)
5-6 0 - 15 CRC
SELF-TEST COMMAND
TRANSMITTER SELF-TEST RESPONSE
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