I tried

screen /dev/ttyUSB1 9600,echo

but I still don't see what I type.

  • Use minicom, instead. – Ipor Sircer Nov 30 '18 at 17:40
  • supposing that the device at /dev/ttyUSB1 understands the AT Hayes command set, try typing ATE1 followed by Enter. – mosvy Nov 30 '18 at 22:41

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