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MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1

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Other useful logs are

•

RCCA to list the default command settings

•

ETSA to monitor the channel tracking status

•

SATA to observe the satellite specific data

•

DOPA to monitor the dilution of precision of the current satellite constellation

•

RVSA to monitor the receiver status

For further information on output logging see Chapter 4, Page 34 and the individual logs listed alphabetically in
Appendix D, Page 136.

Use the 

HELP

 command to list all available commands. For more information on sending commands see Chapter

2, Page 23 and the individual commands listed alphabetically in Appendix C, Page 79.

The MiLLennium GPSCard is ideal for design into DGPS systems because it is capable of operating as either a
reference station or a rover station. .

The GPSCard is capable of utilizing various formats of differential corrections. These formats are divided into two
primary groups 

RTCM

 and 

RTCA

.

For detailed data structure concerning these logs, please see:

Chapter 3, Page 34
Chapter 4, Page 45
Appendix D, Page 136

Operating the GPSCard with a DGPS system requires that the reference station broadcast differential correction
data messages to one or more rover receivers. As there are many methods by which this can be achieved, it is up
to you to establish an appropriate data link that best suits your user requirements.

Whatever data link is chosen, the operator of the reference station will want to ensure that the bit rate of data
transmission is suitable for the anticipated data link and remote users. Use the GPSCard COMn command to the
COM port default bit rate (default is 9600 bps, no parity, 8 data bits, 1 stop bit, no handshake, echo off).

Note that the GPSCard COMn_DTR and COMn_RTS commands are available for remote device keying (such as
a radio transmitter). These commands allow for flexible control of the DTR and RTS lines to be precisely timed
with log transmissions.

Further information may be found in Appendix A.

Table 1-1, following, is a GPSCard pseudorange differential initialization summary.

Positioning

PRTKA/B
POSA/B

ontime or onmark

Post Processing

RGEA/B/D
REPA/B, ALMA/B

ontime
onchanged

NMEA Position

GPGLL
GPGGA

ontime or onmark