SATO M8459S, XL400/410, M8460S, M8490S, M-8400RV, M8485S, CL408/412, CL608/612 Sato Risc Printers 173

Programming Manual			5. Interface Specifications
5	To Printer	CTS (Clear to Send) - When this line is high, the printer
		assumes that data is ready to be transmitted. The printer
		will not receive data when this line is low. If this line is
		not being used, it should be tied high (to pin 4).
6	To Printer	DSR (Data Set Ready) - When this line is high, the prin-
		ter will be ready to receive data. This line must be high
		before data is transmitted. If this line is not being used, it
		should be tied high (to pin 20).
7	Reference	SG (Signal Ground).
20	To Host	DTR (Data Terminal Ready) - This signal applies to
		Ready/Busy flow control. The printer is ready to receive
		data when this pin is high. It goes low when the printer is
		off-line, either manually or due to an error condition, and
		while printing in the Single Job Buffer mode. It will also
		go low when the data in the buffer reaches the Buffer
		Near Full level.

SATO RISC Printers 173