I don't do BSD, but I do do serial. You must make sure of a few things before this will work. First, you will need to ascertain that the cable is correctly configured. For the application to which you refer, you will probably require a null-modem cable. There are numerous 'correct' ways of configuring such a cable, but primarily it crosses over the Tx & Rx wires so that each end of the cable has a receiver connected to a sender and a sender connected to a receiver. Next, each end of the connection must use the same communications parameters. 115200 BPS is becoming somewhat common, but I would try 9600 BPS first. The bitrate could be any standard RS-232 speed, and there is no easy way of knowing what a given port will be using. Other parameters such as parity, word size, etc are easier to guess (8,N,1 is almost universal these days).
Finally, I think it likely that if you get anything from the serial port, it will be a login prompt. I don't know how BSD goes about configuring console logins on serial ports, but unless the system has been so configured, you probably won't get any response.
Last edited by theNbomr; 01-05-2009 at 10:17 PM.