I am using GNU screen to open a serial port and log incoming binary data to a file. The command I use is:

screen -S mySession -L -Logfile data_out /dev/ttyUSB0 115200, cs8

At some point the recording halted. The explanation seems to be that at some point I received the characters 0x11 and 0x13 as a part of the binary stream, which apparently are special terminal characters (Ctrl+Q and Ctrl+S or XON/XOFF?) and affect GNU screen.

Is there a way to log binary data via GNU screen without such issues arising?

1 Answer 1


If your system did actually receive an XOFF (from the remote system) and took whatever incident action, it is because :

  • 1/ The software flow control is enabled on both sides
  • 2/ The remote system is getting to much input from your system with regards to its processing/buffering capabilities.

Since it is wrongdoing to disable flow control, you should check if the remote system can handle hardware flow control (RTS/CTS) and enable it (on both sides) while disabling software flow control (on both sides),

Alternatively, and as a quick&dirty workaround, you can try reducing significantly the communication speed and/or increase remote's input buffer.

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