The ATGM336H GNSS module is a Chinese ublox MAX-M8 type clone, suitable even as a drop in replacement. It is based on the AT6558 GNSS SoC.
The ATGM336H can largely be manipulated by sending PCAS commands, the documentation for which are supported is very sparse. Most of these I have captured from the GNSSToolKit application. Without GNSSToolKit, one can echo these commands directly to the device.
| Description | PCAS | Command |
|---|---|---|
| save configuration | $PCAS00*01 | echo -en '$PCAS00*01\r\n' > /dev/ttyUSB0 |
| hot restart | $PCAS10,0*1C | echo -en '$PCAS10,0*1C\r\n' > /dev/ttyUSB0 |
| cold restart | $PCAS10,2*1E | echo -en '$PCAS10,2*1E\r\n' > /dev/ttyUSB0 |
| factory reset | $PCAS10,3*1F | echo -en '$PCAS10,3*1F\r\n' > /dev/ttyUSB0 |
| stationary mode | $PCAS11,1*1C | echo -en '$PCAS11,1*1C\r\n' > /dev/ttyUSB0 |
| GPS Only | $PCAS04,1*18 | echo -en '$PCAS04,1*18\r\n' > /dev/ttyUSB0 |
| BSD Only | $PCAS04,2*1B | echo -en '$PCAS04,2*1B\r\n' > /dev/ttyUSB0 |
| GPS+BDS | $PCAS04,3*1A | echo -en '$PCAS04,3*1A\r\n' > /dev/ttyUSB0 |
| GPS+GLONASS | $PCAS04,5*1C | echo -en '$PCAS04,5*1C\r\n' > /dev/ttyUSB0 |
| 115200 Baud | $PCAS01,5*19 | echo -en '$PCAS01,5*19\r\n' > /dev/ttyUSB0 |
Some configuration parameters do not have PCAS values and must be sent as raw hex.
| Description | Command |
|---|---|
| Enable DOP Messages | echo -en '\xBA\xCE\x04\x00\x06\x01\x01\x01\x01\x00\x05\x01\x07\x01\x0D\x0A' > /dev/ttyUSB0 |