52 lines
1.4 KiB
Markdown
52 lines
1.4 KiB
Markdown
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# SIMCOM 7600G modem On A Raspberry Pi 4
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This is using [The Waveshare 4G dongle from ThePiHut][4G Dongle].
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**A warning about power**
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No matter which mode used USB disconnects were frequent, mostly when
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moving the device. I incorrectly assumed the default mode QMI was
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causing the issue, but it was the modem drawing more current
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(than the Pi 4 could supply) to latch/keep connected onto a 4G mast.
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This was with the official Raspberry Pi UK 5.1v 3a power supply too.
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The current method I use to power both the Pi 4 & modem is via this
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[USB Hub]. There is a warning at first boot about the device not
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responding but after a automatic bus reset it is fine and works as
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expected.
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## Switching Modes
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The modem has many modes (see the [PDF Manual] pages 50-51), You can use
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the mode you prefer. I recommend the USB standard MBIM mode or QMI if
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you have issues.
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### USB Mode
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Connect to SIMCOM7600 AT com port using minicom...
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```
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apt install minicom
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minicom -D /dev/ttyUSB2
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```
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In minicom get default mode (to revert later if needed)...
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```
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AT+CUSBPIDSWITCH
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```
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Set USB mode...
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```
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AT+CUSBPIDSWITCH=9011,1,1
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```
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After the device has rebooted connect to minicom again & issue...
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```
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AT+CLANMODE=1
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```
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[PDF Manual]: https://usermanual.wiki/m/e87a5540256c1ed0390232e8663c1f46570ff85b21c470d98dce792ecedd3525.pdf
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[USB Hub]: https://smile.amazon.co.uk/gp/product/B08K3GFD3Q
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[4G Dongle]: https://thepihut.com/products/sim7600g-h-4g-usb-dongle
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