Fujitsu DL3800 manual Name Tion

INTERFACE INFORMATION

Pin	Return		Signal	Direc-	Description
No.	Pin No.		name	tion
14	–		Host Busy	Input	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 1284 idle phase is
					aborted and the interface
					returns to the compatibility
					mode.
32	–
			Data Available	Output	Reverse data transfer phase:
					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.
36	–	1284 Active		Input	This signal goes high to cause
					the printer to enter the reverse
					data transfer phase (nibble
					mode).

Interface

User's Manual D-5