Serial port for console access to switch

Just got a Netgear L2 Switch, and need to use VT100 terminal emulation to connect to the switch's serial port.
Does anyone know how to enable the Xserve's serial port for this type of job? When running Zterm for OS X I get an "Error: 16 opening port" and I'm at a loss for how to do it. I've heard that USB to Serial adapters have been working, but it seems silly that the serial port wouldnt work.

Thanks Camelot, your advice was spot on.
Just to close the topic:
Edit "/System/Library/StartupItems/SerialTerminalSupport/SerialTerminalSupport"
and change the line:
ENABLESERIALTERMINAL=$TRUE
to
ENABLESERIALTERMINAL=$FALSE
also, may be redundant with the last step but I edited /etc/ttys and changed:
tty.serial "/usr/libexec/getty serial.9600" vt100 on secure
to
tty.serial "/usr/libexec/getty serial.9600" vt100 off secure
Finally, dont be an idiot like I am, and leave the XServe case lock on... this will prevent the port from operating, and cause you to go crazy.
TwoNine

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