Genicom LA36 manual Centronics Compatible Signals

Interface Information

Centronics Compatible Signals

Pin	Direction	Signal	Description
1	To printer	STROBE L	STROBE pulse low to read data
			A strobe low signal will raise BUSY line to
			high.
2	To printer	DATA BIT 1	These signals are the 1st to the 8th bits of
3	To printer	DATA BIT 2	parallel data.
4	To printer	DATA BIT 3
5	To printer	DATA BIT 4	These signals are active high for a logical 1.
6	To printer	DATA BIT 5
7	To printer	DATA BIT 6
8	To printer	DATA BIT 7
9	To printer	DATA BIT 8
10	From printer	ACKNLG L	ACKNLG pulse low indicates data received
			and ready to receive more data.
			Sent at power up or after INIT sequence.
11	From printer	BUSY H	“high” indicates the printer can not
			receive data (buffer full). BUSY high occurs
			when paper is out, an INIT is received, the
			printer is offline, or an error condition exists.
12	From printer	PE H	PAPER END high signal indicates paper out.
13	From printer	SLCT H	A high signal indicates the printer is in the
			select state.
		SLCT L	Low signal occurs when printer is de selected
			or an error condition exists.
14			Not used
15			Not used
16			0 volts. Logic ground.
17			Chassis ground.
18			+ 5V. Maximum output current is 50 mA.
19-29		TWP returns	0 volts. All at logic ground.
30		INIT ground	0 volts
31	To printer	INIT L	INIT low resets the printer to its initial state
			and clears the buffer.
			Printer must see a pulse > 25 microseconds.
32	From printer	ERROR L	This signal is low when the printer is out of
			paper, not selected, or in an error state.

D-2