Fujitsu DL6400Pro, DL6600Pro user manual Dstb, Ack

Parallel Interface

Table C–1 Parallel interface signals

Pin	Return	Signal	Direction	Description
number	pin	Compatible mode
	number	Nibble mode
1	19		Input
		Data Strobe		• Strobe pulse for reading data (Data 1
		(DSTB)		to Data 8). The printer reads data
				when this signals is low.
				• The pulse width must be 1 µs or more
				at the printer’s receiving terminal.
		Host Clock		This signal is set high when the host
				requests the reverse data transfer phase
				(nibble mode).
2	20	Data 1	Input	• Data 1 to 8 signals correspond to
3	21	Data 2	Input	parallel data bits 1 to 8.
4	22	Data 3	Input	• Data 8 is the most significant bit, but
5	23	Data 4	Input	is not used in the 7-bit ASCII mode.
6	24	Data 5	Input	• All signals must go high at least 1 µs
7	25	Data 6	Input	before the falling edge of the Data
8	26	Data 7	Input	Strobe signal, and must stay high for at
9	27	Data 8	Input	least 1 µs after the rising edge.
10	28		Output
		Acknowledge		• Pulse signal indicating data receiption
		(ACK)		completed (or data reception enabled)
				status
				• Issued when the printer switches from
				offline to online
		Printer Clock		Reverse data transfer phase:
				This signal goes high when data being
				sent to the host is established.
				Reverse idle phase:
				This signal is set low then goes high to
				interrupt the host, indicating that data is
				available.

C-2 User’s Manual