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I'm using a serial device for a project, and what I'm trying to accomplish PC side, is listening for a command sent by the serial device, interpreting the query, running some code depending on the query, and transmitting back the result. To be honest I tried out using PHP as the listener, and it works, unfortunately the infinite loop required to make the script act as a receiver, loads the CPU to 25%. So it's not really the best option. I'm using cygwin right now, I'd like to create a bash script using linux native commands. I can receive data by using: cat /dev/ttyS2 And send a response with: echo "command to send" > /dev/ttyS2 My question is, how do I make an automated listener to be able to receive and send data? The main issue I have, is actually how do I stop the cat /dev/ttyS2 command once information was received, put it into a variable which then I could compare with a switch, or a series of if else then blocks. Afterwards send back a response and start the cycle all over again? Thanks

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