Specifications

Differential and RTK Operations 29

Differential and RTK

The receiver is set as a base station which transmits RTCM messages types 18 and 19

every second, and types 3 and 22 every minute. Following a power cycle it will

automatically start transmitting these messages again (because you have saved the

settings with the $PASHS,SAV,Y command). To change the message type or rate,

use the $PASHS,RTC,TYP command.

RTCM 20 & 21

You must have both [B] and [K] options installed on the receiver.

Send the commands listed in Table 3.3 to the receiver to generate RTCM RTK

message types 3,20, 21, and 22.

$PASHS,RTC,BAS,B Turn on RTCM corrections on port B

When this command is sent, a base station

automatically sends RTCM message type 1

continuously.

$PASHS,RTC,TYP,1,0 Turn off RTCM message type 1.

$PASHS,RTC,TYP,3,1 Turn on RTCM message type 3.

$PASHS,RTC,TYP,18,1 Turn on RTCM message type 18 & 19.

$PASHS,RTC,TYP,22,1 Turn on RTCM message type 22.

$PASHS,RTC,SPD,9 Set internal bit-rate for corrections to burst

mode.

$PASHS,SAV,Y Save settings

Table 3.3: RTK Base Station Commands

Command Description

$PASHS,RST Reset the receiver to factory defaults

$PASHS,ELM,9 Set the RTK Base mask to nine degrees

$PASHS,POS,ddmm.mmm,d,dddmm.mmm,d,saaaaa.aa Enter the phase center of the antenna if

ANR is OFF or the ground mark if ANR is