Star Micronics SCP700 user manual Optional parallel interface pins and signal names, 167

167

Optional parallel interface pins and signal names

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					(36)			(19)
Pin	Signal Name				Direction		Function
No.
						Signals when data is ready to be read. Signal goes from HIGH to LOW (for at
1		STROBE			IN
						least 0.5 ∝s) when data is available.
2 - 9	DATA 1 - 8				IN	Information on the first eight bits of parallel data. Each signal is HIGH for logical 1
						and LOW for logical 0.
10					OUT	9∝s LOW pulse to acknowledge receipt of data
				ACK
									APPENDIX
11			BUSY		OUT	Printer is ready to receive data when LOW. HIGH indicates one of the following
						conditions.
						• Data being entered
						•	Printer off line
						•	Error condition
12	PAPER OUT				OUT	Normally LOW, this signal goes HIGH when the printer is out of paper.
13	SELECTED				OUT	HIGH when the printer is on line
14				—	IN	This signal is not checked by printer.
15				N/C	—	Not connected
16	SIGNAL GND				—	Signal ground
17	CHASSIS GND				—	Chassis ground (isolated from logic ground)
18			+5VDC		—	+5V DC (max. 50mA)
19 - 30			GND		—	Twisted pair return signal ground level
31					IN	LOW when printer is reset to power-on defaults
			RESET
32					OUT	Normally HIGH, this signal goes LOW to signal that printing is disabled due to an
		ERROR
						error condition.