All devices on Unix are mapped to a device file, the serial ports would be /dev/ttyS0 /dev/ttyS1.. First have a look at the permissions on that file, lets assume you are using /dev/ttyS1. Ls -l /dev/ttyS1 You will want read.write access, if this is a shared system then you should consider the security consequences of opening it up for everyone. Chmod o+rw /dev/ttyS1 A very simple crude method to write to the file, would use the simple echo command.

You never bother checking what OS you're on, and blindly try to open BOTH com ports using the SAME filehandle: If you're on Windows, then: $fp = fopen('COM1', 'r+'). How To Install Ppe Xcelerator Duramax here. Succeeds, and then you immediately do this: $fp = fopen('/dev/ttyS1', 'r+'). And KILL the handle you'd just created, because Windows.

Echo -ne ' 033[2J' >/dev/ttyS1 and to read cat -v. All you have to do is open two terminals. In the first terminal you cat everything from the device, e.g. Cat /dev/ttyS0 in the other terminal, you can send arbitrary hex characters and text to the terminal e.g.

Wurlitzer 165 Midi Files here. As follows: echo -e ' x7E x03 xD0 xAF und normaler Text' >/dev/ttyS0 The echo -e command enables the interpretation of backslash escapes. One has to make sure of course that (i) the serial settings (speed, word length, flow ctrl, etc) are correct and (ii) the serial device (on the other end) is not blocking.