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CDM-570/570L Satellite Modem with Optional IP Module Revision 4
Appendix G MN/CDM570L.IOM
G.2 Remote Commands:
Several new remote commands are added to enable the GPS Mode and retrieve GPS
information. These new commands are for the SLAVE modem ONLY, which means the
address field must be the address of the Slave unit, for example 0021.
• GPS – GPS Mode, Query and Command
0 = Disabled
1 = Enabled
Note: When the GPS mode is enabled, the slave modem’s serial’s Baud Rate is changed
to 4800 to receive data from GP-320B. To go back to normal serial operation mode,
disable the GPS Mode.
• DTM? – Retrieve GPDTM data sentence
• GGA? – Retrieve GPGGA data sentence
• ZDA? – Retrieve GPZDA data sentence
• GLL? – Retrieve GPGLL data sentence
• VTG? – Retrieve GPVTG data sentence
• RMC? – Retrieve GPRMC data sentence
Example capture of the remote commands:
<0021/GPS? queries current GPS status
>0021/GPS=0[cr][lf] slave responds that GPS is disabled
<0021/GPS=1 slave is commanded to enable GPS
>0021/GPS=[cr][lf] slave confirms that GPS is enabled
<0021/DTM? slave is commanded to return GPDTM data sentence
>0021/DTM=$GPDTM,W84,,00.0000,N,00.0000,W,,W84*53[cr][lf]
<0021/GGA?
>0021/GGA=$GPGGA,222830,3325.4268,N,11158.2640,W,0,01,00.00,000293.6,M,-
026.2,M,,*7F[cr][lf]
<0021/ZDA?
>0021/ZDA=$GPZDA,223145,14,10,2005,+00,00*63[cr][lf]
<0021/GLL?
>0021/GLL=$GPGLL,3325.4268,N,11158.2640,W,222830,V,N*47[cr][lf]
<0021/VTG?
>0021/VTG=$GPVTG,,T,,M,,N,,K,N*2C[cr][lf]
<0021/RMC?
>0021/RMC=$GPRMC,222830,V,3325.4268,N,11158.2640,W,,,141005,011.8,E,N*12[cr][lf]
<0021/GPS=0 slave is commanded to disable GPS
>0021/GPS=[cr][lf] slave confirms that GPS is disabled
<0021/RMC? slave is commanded to return GPRMC data sentence
>0021/RMC*[cr][lf] slave responds that data is not available
G–2