On Tue, Sep 01, 2009 at 03:38:23PM -0400, Barry L. Kline wrote: > the end of the device. I am able to confirm that it works fine with > minicom, but I'd like to be able to have a program read/write the device > with a largish file and give me a throughput rating. Since you have loopback adapter connected you need to read/write from the device at the same time. So... first attempt: cat </dev/ttyr00 > /dev/null & time cat large_file > /dev/ttyr00 Been a long time since I played with serial comms, but that'd be my first attempt. Second attempt would be to make a full serial connection to another machine (port on the same machine?) and use "ckermit" to transfer a file. -- rgds Stephen