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Multiuser serial port to telnet bridge
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dtermd is a serial to telnet bridge. When you start the daemon it connects to a serial port and listens on a socket (localhost:10000). Then you telnet localhost 10000 to start a serial session. The nice thing is that it supports multiple telnet clients per serial port--any client can type and the data coming from the serial port gets copied out to each client. This lets every connected client see what is going on and optionally control it, which opens the door to many possible uses:

  • Sharing a single hardware device amongst many developers.
  • Pair programming for embedded developers.
  • Demos.
  • etc.


dtermd [<tty> [<baud>]]

<tty> is your serial device. Typically /dev/USB0 on Linux or /dev/cu.usbserial on Mac OS X.

<baud> is the baud rate. It defaults to 115200.


Copyright © 2006-2015 David Caldwell

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see

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