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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

1 2 ... 116 117 118 119 120 121 122 123 124 125 126 ... 189 190

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Ashtech Z-sensor Manuel d'instructions Page 121