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guides:virtual_modem:section_4:changing_the_serial_port

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How to change the serial port on the vmodem.sh script

Please skip this part if your serial port is called /dev/ttyUSB0. Only proceed if this is not the case.

  • To update the vmodem.sh script stored in /boot/vmodem/, do the following:
  • Edit /boot/vmodem/vmodem.sh by running sudo nano /boot/vmodem/vmodem.sh
  • Find the line serport=ttyUSB0 and update it to reflect the correct serial device. For example, if your USB device is called “ttyAMA0”, then type in serport=ttyAMA0. Do not enter the full path to the device, the file name is enough.
  • If you do not see your serial device, or you do not know what it is called, you can do the following.
    • Disconnect the serial device and run ls /dev/tty*. Did you notice something missing compared to the previous printout?
      • Now connect the serial device, wait 5-10 seconds and run ls /dev/tty* again. Do you see a new device in the list?
      • If you do not see a new serial device, the device may not be compatible with Linux. Run dmesg to see if it is detected. In my case it is detected, and is named ttyUSB0:

guides/virtual_modem/section_4/changing_the_serial_port.1537666990.txt.gz · Last modified: 2018-09-23 01:43 by omolini