Rainbow Electronics GE863-GPS low power - Manual (Page 106)

GE863-GPS Software User Guide
1vv0300724 Rev. 3 - 05/07/07
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5.5 Checking GPS device functionality
After a proper power on the device is ready to receive AT commands on the MODEM serial port.
The GPS receiver also will be automatically powered on and it will start the scan of the available GPS
signals.
On the NMEA serial port (default 4800 bps, 8, n, 1) there must be presence of the NMEA sentences.
5.5.1 Controlled mode
The GE863-GPS is by factory default set to controlled mode.
With the command AT$GPSD= is possible to set this configuration.
Parameter:
0 - none; the serial port is not connected to GPS device
2 - serial port connected to GPS serial port: controlled mode (default)