SATO M84PRO RS232 Serial Interface, RS232C Serial Interface Signals, Direction Signal Definition

Section 3: Interface Specifications

RS232 SERIAL INTERFACE

The High Speed Serial Interface is a Plug-In Interface Module that can be installed in the printer by the user.

	SPECIFICATIONS
Asynchronous ASCII	Half-duplex communication
	Ready/Busy Hardware Flow Control
	Pin 20, DTR Control
	Pin 4, RTS Error Condition
	X-On/X-Off Software Flow Control
	Bi-Directional Communication
Data Transmission Rate	9600, 19200, 38400, 57600 bps
Character Format	1 Start Bit (fixed)
	7 or 8 data bits (selectable)
	Odd, Even or No Parity (selectable)
	1 or 2 Stop bits (selectable)
Connector	DB-25S (Female)
Cable	DB-25P (Male), 50 ft. maximum length.
	For cable configuration, refer to Cable
	Requirements appropriate to the RS232C protocol chosen.
Signal Levels	High = +5V to +12V, Low = -5V to -12V

NOTE: Pin assignments begin with one (1) in the upper right corner and descend to thirteen (13) in the upper left corner. Pin number fourteen (14) picks up in the lower right corner and descends to twenty-five (25) in the lower left.

		RS232C SERIAL INTERFACE SIGNALS
PIN	DIRECTION	SIGNAL DEFINITION
1	Reference	FG (Frame Ground)
2	To Host	TD (Transmit Data) - Data from the printer to the host computer. Sends X-On/
		X-Off characters or status data (bi-directional protocols).
3	To Printer	RD (Receive Data) - Data to the printer from the host computer.
4	To Host	RTS (Request to Send) - Used with Ready/Busy flow control to indicate an
		error condition. RTS is high and remains high unless the print head is open (in
		this case, RTS would return to the high state after the print head is closed and
		the printer is placed back on-line) or an error condition occurs during printing
		(e.g., ribbon out, label out).
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 printer 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)

M84Pro Service Manual PN 9001113A Page 3-4