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I am trying to get a SIM7600E-H-4G-HAT running on my Raspberry Pi 3B+, but it is not working. Here is what I've done so far:

  1. Inserted my SIM-Card, connected the antenna to Main, connected the entire hat via GPIO pins to my Pi without any USB cable connected to that hat. I left the two yellow jumpers factory-default like, centered just as pictured in the manual.

  2. I booted the raspberry, set via raspi-config the serial options as described in the manual (no, then yes).

  3. chmod 777 for sim7600_4G_hat_init and added sh /home/.../sim7600_4G_hat_init to rc.local

  4. Rebooted, installed minicom, started sudo minicom -D /dev/ttyS0 and nothing happens and it does not even react on any keystroke. I even compiled the bcm2835 directory and the phoncecall-demo. When I try to sudo ./Phonecall it says

Failed to get byte count on serial.

Both LEDs shine red permanently. What am I doing wrong?

tlfong01
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user1511417
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