1.4 KiB
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SIMCOM 7600G modem On A Raspberry Pi 4
This is using The Waveshare 4G dongle from ThePiHut.
A warning about power
No matter which mode used USB disconnects were frequent, mostly when moving the device. I incorrectly assumed the default mode QMI was causing the issue, but it was the modem drawing more current (than the Pi 4 could supply) to latch/keep connected onto a 4G mast. This was with the official Raspberry Pi UK 5.1v 3a power supply too.
The current method I use to power both the Pi 4 & modem is via this USB Hub. There is a warning at first boot about the device not responding but after a automatic bus reset it is fine and works as expected.
Switching Modes
The modem has many modes (see the PDF Manual pages 50-51), You can use the mode you prefer. I recommend the USB standard MBIM mode or QMI if you have issues.
USB Mode
Connect to SIMCOM7600 AT com port using minicom...
apt install minicom
minicom -D /dev/ttyUSB2
In minicom get default mode (to revert later if needed)...
AT+CUSBPIDSWITCH
Set USB mode...
AT+CUSBPIDSWITCH=9011,1,1
After the device has rebooted connect to minicom again & issue...
AT+CLANMODE=1