Comtech EF Data CDM-570L Installation And Operation Manual page 450

CDM-570/570L Satellite Modem with Optional IP Module
Appendix G
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.
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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.
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Example capture of the remote commands:
<0021/GPS?
>0021/GPS=0[cr][lf]
<0021/GPS=1
>0021/GPS=[cr][lf]
<0021/DTM?
>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
>0021/GPS=[cr][lf]
<0021/RMC?
>0021/RMC*[cr][lf]
GPS – GPS Mode, Query and Command
0 = Disabled
1 = Enabled
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
queries current GPS status
slave responds that GPS is disabled
slave is commanded to enable GPS
slave confirms that GPS is enabled
slave is commanded to return GPDTM data sentence
slave is commanded to disable GPS
slave confirms that GPS is disabled
slave is commanded to return GPRMC data sentence
slave responds that data is not available
G–2
Revision 4
MN/CDM570L.IOM