ashtech DG16 Reference Manual page 78

Send the commands listed in Table 4.2 to the receiver to generate RTCM
differential corrections using message type 1.
$PASHS,RST
$PASHS,PEM,4
$PASHS,POS,ddmm.mmm,d,dddmm.mmm,d,saaaaa.aa
$PASHS,RTC,BAS,x
58
Figure 4.1. RTCM Base Station System
Table 4.2. Differential Base Station Commands
Command
DG14 and DG16 Board & Sensor Reference Manual
Description
Reset the receiver to factory defaults
Set the Base differential mask to four
degrees
Enter the phase center of the antenna
Turn on RTCM corrections on port x
When this command is sent, a base station
automatically sends RTCM message type 1
once per second.