ashtech DG16 Reference Manual page 154

The response message has a free-form Ashtech format. This message does not
have a header or message identifier as shown in the following example:
SPDA:5 SPDB:5 SPDC:5
GPS:YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
SBAS:YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
SYS:GPS DTM:W84 TDP:04
PMD:1 FIX:0 ALT:+00000.00 PDP:40 HDP:04 VDP:04 ERM:600,1200,30,60
PEM:05 SEM:OFF UNH:N ION:Y TRO:Y SAV:N
RTC:OFF PRT:A
SBA:SAM
NMEA: LTN POS GLL GXP GGA VTG GSN MSG GSA GSV SAT GRS RRE TTT ZDA GST GNS CRT
GDC UTM PTT UKO SUD DTM ALM
PRTA: OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF OFF OFF
PRTB: OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF OFF OFF
PRTC: OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF OFF OFF
PER:001.00
Table 6.32 describes the items in the PAR response message:
Item
SPDA:5 Serial port A baud rate. Default is 5 (9600).
SPDB:5 Serial port B baud rate. Default is 5 (9600).
SPDC:5 Serial port C baud rate. Default is 5 (9600).
GPS:Y...Y Indicates which GPS satellites (1-32) will be used (Y) or ignored
(N) in position computations. Default is Y for all satellites.
SBAS:N...N Indicates which SBAS satellites (120 to 137) will be used (Y) or
ignored (N) in position computations. Default is Y for all
satellites.
SYS Indicates the satellite system used by the receiver.
DTM Indicates whether the current geodetic reference datum is WGS-
84 (W84) or a user-defined datum (USR). Default is W84.
TDP Current TDOP (Time Dilution Of Precision) mask setting. The
receiver stops computing positions when the calculated TDOP
value exceeds the TDOP mask value. The default setting is 40.
134
Table 6.32. PAR Response Format
Description
DG14 and DG16 Board & Sensor Reference Manual
Range
0 to 9
0 to 9
0 to 9
Y, N
Y, N
GPS
W84, USR
00.0 to 99.9