GPS PMB-688, SEROUT problems

kentjc913

having difficulty with SEROUT to PMB-688 GPS. only response to first SEROUT command in a list of several.

' {$STAMP BS2pe}
' {$PBASIC 2.5}

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[ I/O Definitions ]

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' GPS PMB-688
GPSpin PIN 0 ' GPS serial output
GPSpout PIN 2 ' GPS serial input

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[ Constants ]

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#SELECT $STAMP
#CASE BS2, BS2E, BS2PE
T2400 CON 396
T4800 CON 188 ' Baud rate for GPS (typical)
T9600 CON 84
T19K2 CON 32
#CASE BS2SX, BS2P
T2400 CON 1021
T4800 CON 500 ' Baud rate for GPS (typical)
T9600 CON 240
T19K2 CON 110
#CASE BS2PX
T2400 CON 1646
T4800 CON 813 ' Baud rate for GPS (typical)
T9600 CON 396
T19K2 CON 188
T38K4 CON 84
GPSBaud CON T4800

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[ Initialization ]

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Initialize:
' GPS outputs
PAUSE 1500
SEROUT GPSpout, GPSBaud, ["$PSRF103,00,00,01,01*25",CR,LF] ' GGA on @ 1 sec
PAUSE 100
SEROUT GPSpout, GPSBaud, ["$PSRF103,01,00,00,01*25",CR,LF] ' GGL off
PAUSE 100
SEROUT GPSpout, GPSBaud, ["$PSRF103,02,00,00,01*26",CR,LF] ' GSA off
PAUSE 100
SEROUT GPSpout, GPSBaud, ["$PSRF103,03,00,00,01*27",CR,LF] ' GSV off
PAUSE 100
SEROUT GPSpout, GPSBaud, ["$PSRF103,04,00,01,01*21",CR,LF] ' RMC on @ 1 sec
PAUSE 100
SEROUT GPSpout, GPSBaud, ["$PSRF103,05,00,01,01*20",CR,LF] ' VTG on @ 1 sec
PAUSE 100

have varied pause intervals with no luck. any ideas, thanks

Kevin Cook

You may want to try and WAIT for the GPRMC and GGA data. You shouldn't have to send the request. Have you tried using a SERIN and waiting for those values?

You wouldn't even need to connect the RX line just the TX line to your Stamp. Example pulled from the test code: SERIN GPSpin, T4800, 2000, Signal_Is_Valid, [WAIT("GPGGA,"), SPSTR 75]