Specifications

Differential and RTK Operations 39
Differential and RTK
which message types to expect, it will automatically use whatever it receives on serial
port c.
You have now set up the remote station. Turn on the GGA, GLL, POS or PBN
message to obtain position.
Setting Up an RTK Remote Station
The receiver can operate in RTK remote mode using any one of the following three
modes:
• RTCM Standard 18, 19, 3, and 22
• RTCM Standard 20, 21, 3, and 22
• Ashtech Standard DBN
Using RTCM Messages
Operating an RTK remote using RTCM messages is almost identical to operating a
Differential remote receiver. The main differences are:
1. The data from the base station is RTCM Types (18 & 19) or (20 & 21) and 3
& 22, instead of 1 or 9.
2. The accuracy is approximately 100 times better.
You must have both the Differential remote option, [U], and the Phase differential
option, [J], installed in your receiver.
You must have a source of RTK data, usually a radio receiving a transmission from
an RTK base station. Connect this radio to one of the receiver’s serial ports.
Table 3.11: Differential Remote Station Commands
Command Description
$PASHS,RST Reset the receiver to factory defaults
$PASHS,RTC,REM,c Set the receiver as a remote station, receiving corrections on serial port c
$PASHS,SPD,c,d Set the baud rate of serial port c to the same as the radio providing the
corrections.
$PASHS,SAV,Y Save settings