…still, it's shorted to GND on my module.
Am 10.12.2017 um 00:53 schrieb
Michael Balzer:
My multimeter says pin 79 (GNSS_ANT) is connected to GND (pins 77, 78 + 80 + frame etc.)…?
I've measured before & after unplugging the pigtail…
…and I think I found the bug: it seems our SIMCOM board design is wrong.
The official docs say GNSS_ANT is pin 79:
But we're using pin 78:
Mark, can you confirm this?
Regards,
Michael
Am 09.12.2017 um 23:46 schrieb Michael Balzer:
I'm currently working on the NMEA module. The MUX channel is working, but I don't get a GPS fix.
I've tried all GPS commands and now suspect my SIMCOM module having a hardware issue.
I'm doing this:
OVMS > level debug
OVMS > power simcom on
…wait for the MUX to be ready, then issue…
OVMS > simcom muxtx 4 AT+CGPSNMEA=1
OVMS > simcom muxtx 4 AT+CGPS=1,1
…now the SIMCOM begins sending NMEA $GPGGA lines once per second looking like this:
D (2937174) SIMCOM rx: f9 05 ff 35 24 47 50 47 47 41 2c 2c 2c 2c 2c 2c ...5$GPGGA,,,,,,
D (2937174) SIMCOM rx: 30 2c 2c 2c 2c 2c 2c 2c 2c 2a 36 36 0d 0a 60 f9 0,,,,,,,,*66..`.
Normally the modem should get a GPS fix within about 1-2 minutes and begin filling data in the $GPGGA record.
But my modem won't, it just keeps sending empty fields.
Can someone please try this with his/her module?
To disable the GPS receiver, issue:
OVMS > simcom muxtx 4 AT+CGPS=0
Thanks & regards,
Michael
-- Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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-- Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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-- Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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