Star Micronics SP2000 user manual Appendix B Serial Interface, Pins and Signal Names

Appendix B: Serial Interface

B-1. Pins and Signal Names

	Pin No.	Signal Name	Direction			Function
	1	FG	—	Frame ground
	2	TXD	OUT		Transmission data
	3	RXD	IN		Receive data
	4	RTS	OUT		When Memory Switch 4-D = 0: Same as DTR signal
					When Memory Switch 4-D = 1: Always SPACE
	5	N.C.			Not connected
	6	DSR	IN		• DIP Switch 2-7 = OFF
					STAR Mode
					Status of this signal is not checked.
					ESC/POS Mode
					In DTR/DSR communication mode when Memory Switch4-5 = 0,
					indicates whether data receive from host is enabled or disabled.
					Space: Receive enabled
					Mark: Receive disabled
					In DTR/DSR communication mode when Memory Switch 4-5=1,
					status of this signal is not checked.
					This signal is not checked in the X-ON/X-OFF communication
					mode.
APPENDIX	7	SG
					Signal ground
					• DIP Switch 2-7 = ON
					This signal used for external reset. Printer is reset whenever signal
					is in mark state with pulse width of 1mS or more.
	8 -19	N.C.			Not connected
	20	DTR	OUT		Indicates whether data receive from host is enabled or disabled.
					DTR/DSR Communication Mode
					Space when receive is enabled.
						Printer status	Memory switch 1-7
							0	1
					1. During the period from when the power is
						turned on (including resetting using the in-	BUSY	BUSY
						terface) to when the printer is ready to re-
						ceive data.
					2. During self printing and dot alignment ad-		BUSY	BUSY
						justment.
					3. During paper feeling using the paper feed		BUSY	—
						button (ESC/POS mode only).
					4.	When the printer stops printing due to a	BUSY	—
						paper end or a paper near end.
					5.	When an error has occurred.	BUSY	—
					6.	When the receive buffer becomes full.	BUSY	BUSY

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