User's Manual

RV-M50-EC Technical Manual

3.8 Local NMEA data from the internal GPS

The modem may be configured to output standard NMEA 0183 GPS messages from its internal GPS

receiver. For GPS tracking, these GPS transponders can receive GPS position reports from other radios,

and they may also be configured to output their own GPS location via their serial port.

The following NMEA messages are available

NMEA Message

Bit Number

(zero based)

Bit Mask

(hex format / decimal)

GGA

0×001 / 1

GLL

0×002 / 2

RMC

0×100 / 256

You can change the NMEAMASK parameter to modify with of the NMEA sentences will come out the

serial port.

For example, to have only the RMC sentence come out the serial port, use the following command”

NMEAMASK 256

To have the GGA and GLL come out the serial port use this command:

NMEAMASK 3

The NMEAMASK parameter is the sum of all of the decimal values of the individual bits corresponding to

the NMEA messages.

4. Diagnostic Provisions

4.1 Status and Statistics Command

Diagnostic information is read using AT commands, while the unit is in Command Mode. Refer to the

section “User Serial Port Commands” to learn how to put the modem into Command Mode.

4.2 ATST Command

The ATST command will return the following information:

STATISTICS

Good RX Packets: nnn (packets received over the air with no bit-errors and correct address)