Lexmark 249X, 248X manual Parallel Pin Assignments, Pin Line Description

Parallel Pin Assignments

Pin	Line	Description
1	STROBE*	When the printer receives the STROBE* low from the
		computer, the printer reads the data from the interface and
		sets the BUSY line high. STROBE* must not occur when the
		BUSY line is high; otherwise, unpredictable results may occur.
2-9	DATA	These signals are the 8 bits of parallel data sent from the
		computer. A high level indicates a logical 1. A low level
		indicates a logical 0. The printer reads data from the DATA
		lines when a STROBE* pulse is received.
10	ACKNLG*	The ACKNLG* pulse tells the computer that the data from the
		previous STROBE* pulse has been read. An ACKNLG* pulse
		is also generated when the printer is turned on, or at the
		completion of the printer initialization by an INIT* requested
		from the computer.
11	BUSY	When the printer sets BUSY high, it cannot receive data. The
		BUSY line goes high in response to a STROBE* pulse. This line
		remains high until the data is read. BUSY is also high when:
		• The receive buffer is full.
		• An out-of-paper condition occurs.
		• The printer receives an INIT* signal.
		• Start/Stop is pressed to go offline.
		• A printer error condition has occurred.
		• The printer is initializing.
12	PE	The printer sets Paper End (PE) high when approximately
		12.7 mm (0.5 in.) of paper remains in the printer. PE remains
		high until the operator loads paper and presses Start/Stop.
13	SLCT	When the printer is ready, it sets the SLCT line high.
		The SCLT lines go low when:
		• Start/Stop is pressed to go offline.
		• There is an error or out-of-paper condition.
		• The printer receives an ESC Q. It ignores all incoming data
		except DC1, which returns the printer to a select state.
14	AUTO	The printer executes one line feed when this signal, valid only
	FEED XT	in Epson** mode, is low.
15		Not used.
16	GND	Logic ground.
17	CHASSIS	Ground level.
	GROUND
18	+5 volts	Maximum 300 mA.
19-30	GND	Ground level.

* Inverted logic (signal is active when low).

94 Section 6: Using the Printer Interface