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Reference Station Health
You may set the reference station to "unhealthy", which causes all remote receivers to
ignore the messages they receive from that base station.
Other RTCM Messages
Partial Differential corrections: Message 9 and 34
These are alternatives to messages 1 and 31. They should only be used if you have a
low bandwidth data link (~100bps). Use of high-bandwidth datalinks, and messages 1
and 31 are recommended.
Message type 1 cannot generate at the same time as type 9. Message type 31 cannot
be generated at the same time as 34. It is possible, though unusual, to generate
message types 1 and 34, or 9 and 31.
Message 2 and 32
These are automatically generated when the base station is transmitting differential
corrections and a new ephemeris is downloaded from the satellites.
Filler: Message 6 and 34 Null Frame
This message is provided for datalinks that require continuous transmission of data,
even if there are no corrections to send.
Special Message: Message 16 and 36
These message allow you to transmit an ASCII message from the base station.
Using a PC Interface
If you are using Evaluate software to interface to your receiver you may use
initialization files (
) to send the base station setting commands for you.
*.gps
To monitor the corrections from a PC, turn on the MSG message
$PASHS,NME,MSG,y,ON
This generates an ASCII echo of the RTCM messages being transmitted by the base
station. Use different receiver serial ports for MSG and the actual transmitted RTCM
messages.
Using a Handheld Interface
If you are using Ashtech software running on the Husky FS/2 handheld computer,
differential set-up is controlled via a series of menus designed to free users from
knowing or entering commands. Handheld software allows users to monitor and
control most receiver functionality.
Differential and RTK Operations
53
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