Kyocera 9530DN Serial Interface Option, Interface voltage levels, Interface Signals, In or out

Computer Interface

Serial Interface (Option)

Interface Signals

The pins of the printer’s RS-232C interface connector carry the signals listed in the table below. The table also indicates whether each signal is incoming or outgoing with respect to the printer.

Pin	In or out	Signal	Description
1	—	FG	Frame Ground. This pin is connected
			directly to the printer frame.
2	Out	TXD	Transmit Data. This pin is used to output
			asynchronous data sent from the printer
			to the computer. This signal is often used
			in handshaking.
3	In	RXD	Receive Data. This pin is used to input
			serial asynchronous data sent from the
			computer to the printer.
4	Out	RTS	Request To Send. This output is always
			high (above 3 volts).
5	In	CTS	Clear To Send. Not used.
6	In	DSR	Data Set Ready. Not used.
7	—	SG	Signal Ground. This pin is used to
			establish a common reference level for
			the voltages of all signals other than
			Frame Ground.
20	Out	DTR	Data Terminal Ready. This pin is used to
			notify the status of the printer buffer (i.e.,
			nearly full or nearly empty) when
			handshaking is used. The pin goes high
			(above 3 volts) when the buffer is able to
			accept more data.

Interface voltage levels

The voltage levels of the interface signals conform to EIA RS-232C specifications. The voltage level of SPACE is 3 to 15 volts. The voltage level of MARK is -3 to -15 volts. Voltages between -3 and 3 volts are undefined.

5-6 ADVANCED OPERATION GUIDE