Kantronics KAM 98, User Manual

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When the second serial port is activated, using the GPSPORT command, the
NMEA data input must be cabled to pin 3 of the auxiliary port (AUX) of the mo-
dem, rather than the RS-232 serial port. Wiring to the AUX port is straightfor-
ward; you must simply attach the two wires coming from the GPS device to the
port connector. Wire the NMEA+ wire to pin 3 and the NMEA- wire
to pin 6, ground (of the DB-9 connector). In addition, you must configure jumper
J9, just behind the AUX connector on the pc board, with the jumper on the center
pin and pin 2 (center and to the right side when looking from the back of the
unit).
The KAM’98 is configured for GPS tracker operation in the normal manner, as
outlined the previous sections. When using the second port for attachment of the
GPS device (instead of the normal serial port), the only setup changes required
are to turn on and configure this port, using the GPSPORT command. The
GPSPORT command allows you to configure a baud rate of 300, 600, 1200,
2400, or 4800 for the GPS device, use normal or inverted data, and use or not use
checksums sent by some NMEA strings. If GPSPORT is set to a baud rate of “0,”
then the port is disabled.
Example
The following example goes through the steps of setting up a tracker using the
Magellan Meridian XL GPS unit and the KAM’98.
1. Set up the modem parameters for GPS operation in the usual manner:
GPSHEAD 1 $GPRMC
LTP 1 GPS VIA RELAY, WIDE
BLT 1 EVERY 00:10:00 CLEAR
LTRACK 5 LT1 TIME
GPSTIME VALID RMC
MONITOR ON
2. Then configured the GPSPORT for 4800 baud operation, normal signaling,
and to check data input using checksums:
GPSPORT 4800 NORMAL CHECKSUM
These commands complete the parameter configuration of the KAM’98 as a
tracker with the GPS device attached to the AUX read-only serial port.
Packet Modes of Operation GPS NMEA Interfacing Capability
User’s Guide 196 KAM’98 v 8.3