ashtech GG Surveyor Reference Manual page 169

Example:
where Table 6.63 outlines the $GPMSG response format.
Table 6.63: $GPMSG Response for RTCM Messages 1, 31, and 9, 34
Command/Response Formats
$GPMSG,01,0000,2220.0,1,0,127,003702:00,2,12, -
0081.30,+0.026,235,2,13,+0022.86,+0.006,106,2,26,-0053.42,-
0.070,155,2,02,+0003.56,+0.040,120, 2,27,+0047.42,-0.005, 145*7A
Item
$GPMSG Header
01 RTCM message
0000 Station ID
2220.0 Z count in seconds and tenths
1 Sequence number
0 Station health
127 Total number of characters of the time item
003702.00 Current time in hours, minutes, and seconds
2 UDRE for SV 12
12 Satellite PRN number
-0081.30 PRC for SV 12
+0.026 RRC for SV 12
235 IODE for SV 12
2 UDRE for SV 13
13 Satellite PRN number
+0022.86 PRC for SV 13
+0.006 RRC for SV 13
106 IODE for SV 13
2 UDRE for SV 26
26 Satellite PRN number
-0053.42 PRC for SV 26
-0.070 RRC for SV 26
155 IODE for SV 26
2 UDRE for SV 26
02 Satellite PRN number
Description
151