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My multimeter says pin 79 (GNSS_ANT) is connected to GND (pins 77,
78 + 80 + frame etc.)…?<br>
<br>
I've measured before & after unplugging the pigtail…<br>
<br>
…and I think I found the bug: it seems our SIMCOM board design is
wrong.<br>
<br>
The official docs say GNSS_ANT is pin 79:<br>
<br>
<img src="cid:part1.33233442.2271FB23@expeedo.de" alt=""><br>
<br>
<br>
But we're using pin 78:<br>
<br>
<img src="cid:part2.AD942583.79734AB1@expeedo.de" alt=""><br>
<br>
<br>
<br>
Mark, can you confirm this?<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">Am 09.12.2017 um 23:46 schrieb Michael
Balzer:<br>
</div>
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cite="mid:960e32c7-c37c-0e43-4563-38d32d28b867@expeedo.de">
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I'm currently working on the NMEA module. The MUX channel is
working, but I don't get a GPS fix.<br>
<br>
I've tried all GPS commands and now suspect my SIMCOM module
having a hardware issue.<br>
<br>
I'm doing this:<br>
<br>
<tt>OVMS > level debug</tt><tt><br>
</tt><tt>OVMS > power simcom on</tt><br>
<br>
…wait for the MUX to be ready, then issue…<br>
<br>
<tt>OVMS > simcom muxtx 4 AT+CGPSNMEA=1</tt><tt><br>
</tt><tt>OVMS > simcom muxtx 4 AT+CGPS=1,1</tt><br>
<br>
…now the SIMCOM begins sending NMEA $GPGGA lines once per second
looking like this:<br>
<br>
<tt>D (2937174) SIMCOM rx: f9 05 ff 35 24 47 50 47 47 41 2c 2c 2c
2c 2c 2c ...5<b>$GPGGA,,,,,,</b></tt><tt><br>
</tt><tt>D (2937174) SIMCOM rx: 30 2c 2c 2c 2c 2c 2c 2c 2c 2a 36
36 0d 0a 60 f9 <b>0,,,,,,,,*66</b>..`.</tt><br>
<br>
Normally the modem should get a GPS fix within about 1-2 minutes
and begin filling data in the $GPGGA record.<br>
<br>
But my modem won't, it just keeps sending empty fields.<br>
<br>
Can someone please try this with his/her module?<br>
<br>
To disable the GPS receiver, issue:<br>
<br>
<tt>OVMS > simcom muxtx 4 AT+CGPS=0</tt><br>
<br>
Thanks & regards,<br>
Michael<br>
<br>
<pre class="moz-signature" cols="160">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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<br>
<pre class="moz-signature" cols="160">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
</pre>
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