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How can I connect a GPS to my G-858 Magnetometer?
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Last Updated
26th of June, 2009
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It is a fairly simple task to connect a GPS to a G-858 magnetometer. You can use the External I/O cable assembly and a null modem to connect the G-858 to most GPS receivers.

Null modems are available from Geometrics or from local Radio Shack or computer stores. The Null modem pin configuration for GPS receivers that have a data cable compatible with 9 pin IBM PC COM ports has male pins on both sides.

The GPS should be set to output NMEA data that contains the $GPGGA sentence.
Be sure to set the RS232 protocol to 9600 Baud, 8 Databits, 1 Stop Bit and No Parity
 
The G-858 must have its serial port set to the same baud rate as the GPS.
 
You can use System Setup->Com & Field Note String Setup->Chat Mode to determine whether correct communications have been established.
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