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Background The main reason why you need any program like minicom to communicate over a serial port is that the port needs to be set up prior to initiating a connection. If it weren't set up appropriately, the cat and echo commands would not do for you what you might have expected.
Notice that once you run a program like minicom, the port is left with the settings that minicom used. You can query the communication settings using the stty program like this: stty. Picocom also will let you connect to a serial port without reconfiguring it ( --noinit) and will let you exit without restoring the serial port configuration ( --noreset or use Ctrl-A/ Ctrl-Q to quit picocom). I've found picocom to be much easier to use than minicom. For reasons I haven't figured out, minicom will sometime simply not send or receive data on a port that worked moments before or that picocom has no trouble with. It's probably some arcane configuration option, but whatever it is I can't figure it out (and this behavior has happened on more than one machine). – Oct 24 '13 at 21:11.
I found a way using a shell script that put cat as a background process and a while loop that read the user input and echo it out to the port. I modified it to be more general and it fitted my purpose perfectly. #!/bin/sh # connect.sh # Usage: # $ connect.sh # Example: connect.sh /dev/ttyS0 9600 # Set up device stty -F $1 $2 # Let cat read the device $1 in the background cat $1 & # Capture PID of background process so it is possible to terminate it when done bgPid=$! # Read commands from user, send them to device $1 while read cmd do echo '$cmd' done > $1 # Terminate background read process kill $bgPid.
Howerver, the real gotcha in your script is that the background process is only killed if you press Ctrl+D to end your script, because that ends the while loop cleanly. If you kill it with Ctrl+C or with the kill command, then the cat process stays alive. To fix that you would need to use the trap command to execute kill $bgPid when the shell exits, like. Honestly, I wouldn't even mind if you just added my whole script to your post. I tried to do that, but the edit was rejected. – Sep 26 '16 at 11:08 •.
This script is based on, but sends everything over the serial port (except Ctrl+Q), not just single commands followed by Enter. This enables you to use Ctrl+C or Ctrl+Z on the remote host, and to use interactive 'GUI' programs like aptitude or alsamixer. It can be quit by pressing Ctrl+Q. #!/bin/bash if [[ $# -lt 1 ]]; then echo 'Usage:' echo ' femtocom [ [.
Budova avtomata ak 47. The AK-47 does not have a gas valve; excess gases are ventilated through a series of radial ports in the gas cylinder. The Kalashnikov operating system offers no upon bolt rotation, but uses an extractor claw to eject the spent cartridge case.
It depends on what you want to do. Do you want to run a shell or applicaiton interactively from the terminal, connect out to another computer over the serial line, automate communication with a device over a serial port? If you want bidirectional communication then I presume you want something interactive with a human on the terminal. You can configure the system to allow logins from a terminal over a serial port by seting up a session on the serial port - getty is the tool for setting up a terminal and allowing logins onto it. Put an entry in your file to run it on the appropriate serial port on a respawn basis.