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My program get the device ( a simulator)data(text data) from ttyS0.
I am trying to send data(using "cat filename > /dev/ttyS0") from the command line(gnome-terminal) to ttyS0, so that the program can use this data sent through "cat" for testing purpose.
However, this does not work. The program can not get the data and I open the gtkTerm on port ttyS0, which does not have any data displayed either.
I used "echo" in my original post to test out data can be sent to ttyS0 from command line.
In the short term though, you can achieve somewhat what you are attempting by simply looping back the Tx pin to the Rx pin on the serial port. On a female connector, all you need is a paper clip or short piece of wire. The relevant conductors are normally pins 2 & 3 on a standard 9-pin or 25-pin serial connector (although the roles are typically reversed between the two formats). If this is a USB <==> serial converter, you must first have a suitable Linux driver to support it.