Instruction manual

Command Response Formats Page 105
Command
NMEA GSN (Signal Strength/Satellite Number)
$PASHS,NME,GSN,X,Y
This command enables/disables the signal strength/satellite number response message
on port x, where x is either A, B, or C, and y is ON or OFF.
Example: Enable GSN message on port C
$PASHS,NME,GSN,C,ON followed by output command
$PASHS,OUT,x,NMEA where x is the output port.
$GPGSN
The response is a message in the form:
$GPGSN,qq,pp,ss,ss,.....ttt*cc
For each SV locked, a PRN number item and a signal strength item follow; qq indicates the number
of SVs displayed in the message.
Table 4.51 defines the field structure.
Example:
Set: $PASHS,,NME,GSN,A,ON
Response: $GPGSN,03,03,060,23,039,16,021,999*7D
Table 4.52 presents a typical GSN response message.
Table 4.51: GSN Structure
Field Description
qq Number of SVs locked, number of SVs in message
pp SV PRN number, pp = 1 to 32
ss SV signal strength/signal-to-noise ratio, ss = 00 to 99
ttt 999 ends the message if no RTCM age is reported or age of differential
corrections in seconds if in RTCM mode
Table 4.52: Typical GSN Message
Item Description
$GPGSN Header
03 Number of SVs locked
03 PRN number of the first SV
060 Signal strength of the first SV
23 PRN number of the second SV