I use screen to connect to devices via RS232 with a USB-serial dongle. Currently, I use this command to invoke screen (where 115200 is my baud-rate):

screen /dev/ttyUSB0 115200

Usually, I have more than one device (/dev/ttyUSB0 and /dev/ttyUSB1). Sometimes their baud-rate differs. Currently, I open a new terminal emulator and run screen for each instance, but that kind of defeats the purpose of screen. Can I access both devices in a single instance of screen?

I'm thinking this would involve launching screen with no arguments and then attaching the session to a TTY with a specified baud-rate after it is created, but I don't see a command to change TTYs within a session. I know tmux can do that, but I'd rather stick with screen.


Once you've launched screen, you can use its internal screen command to attach windows to additional terminal devices. Type C-a: to get the prompt, then use

screen /dev/ttyUSB1 ######

where ###### is this device's baud-rate. You can also put these commands in your .screenrc to attach the devices automatically when you start screen, or you could bind a keystroke to this command to get a shortcut.

See the Window Types section of the screen manual.

  • doesn't that spawn an instance of screen within screen? Jan 27 '17 at 22:04
  • No, it's just the command to open a new window. It's the same as the C-a c command.
    – Barmar
    Jan 27 '17 at 22:24

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