Odd, I guess my earlier test with the voltmeter was faulty, I tested the port using a gender changer and jumper wire (home made serial loopback :-) and was able to receive a test message back sent via ttyS0 using these instructions... "As a jumper you could use a mini (or micro) jumper cable (sold in some electronic parts stores) with mini alligator clips. A small scrap of paper may be used to prevent the mini clips from making electrical contact where it shouldn't. Metal paper clips can sometimes be bent to use as jumpers. Whatever you use as a jumper take care not to bend or excessively scratch the pins. To receive something from a port, you can go to a virtual terminal (for example Alt-F2 and login) and type something like "cp /dev/ttyS2 /dev/tty". Then at another virtual terminal you may send something to ttyS2 (or whatever) by "echo test_message > /dev/ttyS2". Then go back to the receive virtual terminal and look for the test_message." So I guess that means the signal is going out the port? (as opposed to being blocked?) What then could be the problem? I know the serial port on the cable box is open (I tested it with a windows based channel-changing script for SageTV). If anybody has a clue on where else I can look to resolve this I would really appreciate the help. Thanks, Kamy - To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html