Difference between revisions of "Fitlet3 How to use GPS features of Sierra EM7421 modem"
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(Created page with "* This application note applies to fitlet3 configured with Sierra EM7421 cellular modem. * It explains how to use the GPS feature {| class="wikitable" border="1" | File:EM...") (change visibility) |
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* This application note applies to fitlet3 configured with Sierra EM7421 cellular modem. | * This application note applies to fitlet3 configured with Sierra EM7421 cellular modem. | ||
* It explains how to use the GPS feature | * It explains how to use the GPS feature | ||
| − | + | The EM7421 includes three RF connectors for use with host-supplied antennas: | |
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
| [[File:EM7421.png|200px|thumb|]] | | [[File:EM7421.png|200px|thumb|]] | ||
|} | |} | ||
| + | Main RF connector — Tx/Rx path | ||
| + | GNSS RF connector — Dedicated GPS, GLONASS, BeiDou, Galileo, and QZSS | ||
| + | Auxiliary RF connector — Diversity, MIMO, GPS, GLONASS, BeiDou, Galileo and QZSS | ||
==To get the GPS working via the GNSS RF connector:== | ==To get the GPS working via the GNSS RF connector:== | ||
| − | 1. Unplug the connector from the Auxiliary RF connector | + | 1. Unplug the connector from the Auxiliary RF connector |
| − | + | 2. Connect it to GNSS RF connector. | |
| − | 2. Connect it to GNSS RF connector. | + | |
==To get the GPS working via the Auxiliary RF connector (Diversity antenna) - change the modem configuration:== | ==To get the GPS working via the Auxiliary RF connector (Diversity antenna) - change the modem configuration:== | ||
Latest revision as of 14:11, 5 June 2023
- This application note applies to fitlet3 configured with Sierra EM7421 cellular modem.
- It explains how to use the GPS feature
The EM7421 includes three RF connectors for use with host-supplied antennas:
Main RF connector — Tx/Rx path GNSS RF connector — Dedicated GPS, GLONASS, BeiDou, Galileo, and QZSS Auxiliary RF connector — Diversity, MIMO, GPS, GLONASS, BeiDou, Galileo and QZSS
To get the GPS working via the GNSS RF connector:
1. Unplug the connector from the Auxiliary RF connector 2. Connect it to GNSS RF connector.
To get the GPS working via the Auxiliary RF connector (Diversity antenna) - change the modem configuration:
1. Unlock password protected AT commands
echo -ne 'AT!ENTERCND="A710"\r\n' > /dev/ttyUSB3
2. Set the autostart for GPS
echo -ne 'AT!GPSAUTOSTART=1\r\n' > /dev/ttyUSB3
3. Set the GPS antenna to the aux port (diversity), where is the antenna connected, because by default: the "gnss rf" port is selected in the modem configuration.
echo -ne 'AT!CUSTOM="GPSSEL",1\r\n' > /dev/ttyUSB3
