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ZTerm is not necessary any more:

Serial Communication in OSX Terminal

ls /dev/tty.*

to get a list of all of your serial ports. Pick the one that you want to open.

/dev/tty.BTRS232 /dev/tty.Tigoe6630-AppleAgent-1
/dev/tty.Bluetooth-Modem /dev/tty.Tigoe6630-Dial-UpNetwor-2
/dev/tty.KeySerial1 /dev/tty.modem

Knowing the serial port, you can just type screen portname datarate:

screen /dev/tty.Keyserial1 9600