Fujitsu DL6400Pro, DL6600Pro user manual Inprm

Parallel Interface

Table C–1 Parallel interface signals (Continued)

Pin	Return			Signal	Direction	Description
number	pin			Compatible mode
	number			Nibble mode
14	—				Input	Not used
				Auto Feed XT
				Host Busy		Reverse data transfer phase:
						This signal is set low when the host can
						receive data, and goes high when the
						host has received data. Following a
						reverse data transfer, the interface enters
						the reverse idle phase when the Host
						Busy signal goes low and the printer has
						no data.
						Reverse idle phase:
						This signal goes high when the Printer
						Clock signal goes low so that the
						interface re-enters the reverse data
						transfer phase. If it goes high with the
						1284 Active signal low, the idle phase is
						aborted and the interface returns to the
						compatibility mode.
15	—	—			—	No connection
16	—	Signal Ground			—	Logic ground level (0 V)
			(SG)
17	—	Frame Ground			—	Printer chassis ground line. FG and SG
			(FG)			are connected.
18	—	+5V			Output	+5V source (up to 300 mA)
19–30	—	Signal Ground			—	Twisted-pair return lines
			(SG)
31	—				Input	If this signal is low for more than 50 µs,
			Input Prime
				(INPRM)		the printer is reset to initial status and
						placed online.

C-4 User’s Manual