Communication with the controller is achieved through 7-bit ASCII with parity. Specs: Even parity, 4800 baud, two stop bits, (RS)-232-C, RS-422 also provided.

RS-232-C
Personal Computer				Controller

								1	GND
	TD	2	----------------	3	RD
	RD	3	----------------	2	TD
	RTS	4	----\      /----	4	RTS
	CTS	5	<---/      \--->	5	CTS
	DSR	6	<---\      /--->	6	DSR
	GND	7	----|------|----	7	GND
	CD	20	----|------X--->	8	CD
	DTR	8	<---X-----------	20	DTR