Linux – How do I read the value of an RTS/CTS pin on Linux?

How do I read the value of an RTS/CTS pin on Linux?… here is a solution to the problem.

How do I read the value of an RTS/CTS pin on Linux?

I want to know the status of the RTS/CTS pin on the serial port of my Linux machine.

Also, since I’m using /dev/ttyUSB0, does the same mechanism work?

greeting
Akash

Solution

termios is generally recommended for interacting with serial ports, but I don’t think RTS/CTS access is supported. YOU NEED TO USE IOCTL(2) WITH TIOCMGET AND TIOCMSET. You can look at an example here

Your USB dongle may support RTS/CTS, but there are many different USB serial devices, not all of which do. In addition, latency can be an issue. FTDI (probably the most popular USB serial chip provider) takes up to 3 characters to stop the transfer after the CTS stop event.

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