ashtech DG14, Reference Manual

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72 DG14 and DG16 Board & Sensor Reference Manual
Single Manual Mode
In Single Manual Beacon mode, the DG16 tracks the specified beacon signal
on Channel 1. After enabling Manual mode with the
$PASHS,BCN,MOD,MAN command, use the $PASHS,BCN,CHN command
to assign a frequency to Channel 1.
Use the
$PASHS,BCN,OUT command to output the demodulated beacon
data from Channel 1 to the serial port.
Dual Manual Mode
In Dual Manual Beacon Mode, the DG16 tracks the two specified beacon
signals on Channel 1 and Channel 2, respectively. After enabling Manual
mode with the
$PASHS,BCN,MOD, MAN command, use the
$PASHS,BCN,CHN command to assign a frequency to Channel 1, and enter
the command a second time to assign a frequency to Channel 2.
Use the
$PASHS,BCN,OUT command to output the demodulated beacon
data from Channel 1 or Channel 2.
Working with the Beacon Directory
The DG16 beacon directory is similar to, but usually larger than, the beacon
almanac received in the RTCM Type 7 message. The Type 7 message
contains information about a specific network of reference stations, and the
receiver directory contains the same information for all stations. The receiver
beacon directory contains:
• Default list of stations kept in ROM
• List of stations received from RTCM Type 7
• User entered stations
After a cold start the beacon directory consists of the default list of stations
kept in ROM.
The beacon directory is kept in BBU. It can be erased with the
$PASHS,BCN,DIR,CLR command. You can reset the beacon directory to the
default list of stations kept in ROM only with the $PASHS,BCN,DIR,INI
command.
Blocking RTCM Type 7 Message
The most recently received record (RTCM Type 7 or user entry) may override
preceding entries in the beacon directory. Use the
$PASHS,BCN,RT7,Y/N
command to prevent the overwriting entries with RTCM type 7 information.
The default is Y, overwrite information.
If you enable RTCM type 7 information, and receive RTCM type 7 from a