Fujitsu DL6600Pro, DL6400Pro This signal is set low when the printer is, LSB, then data bit

							Parallel Interface
				Table C–1 Parallel interface signals (Continued)
Pin	Return		Signal			Direction	Description
number	pin		Compatible mode
	number				Nibble mode
32	—					Output	This signal goes low under the following
			Fault
							printer conditions:
							(1) Offline
							(2) Paper out
							(3) Cut-sheet feeder error
							(4) Other printer error
							Reverse data transfer phase:
				Data Available
							This signal is set low when the printer is
							ready to send data to the host. During
							the data transfer, it is used as data bit 0
							(LSB), then data bit 4.
							Reverse idle phase:
							This signal is used to indicate that data is
							available.
33	—	Signal Ground				—	Logic ground level (0 V)
			(SG)
34	—	—				—	No connection
35	—	+5 VR				Output	Pulled up to +5 V through a 3.3 kΩ
							resistor
36	—					Input	Not used
			SLCT-IN
				1284 Active			This signal goes high to cause the printer
							to enter the reverse data transfer phase
							(nibble mode).
				Notes:

1.Left-aligned signal names are in compati mode and right-aligned ones are in nibble mode.

2.The direction (input and output) refers to the printer.

3.Return line: Twisted-pair return line connected to the signal ground level.

INTERFACE INFORMATION

User’s Manual C-5