Epson Photo750 manual Parallel InterfaceForward channel, Parallel I/F

EPSON Stylus Photo 750 Revision A

1.3 Parallel Interface

This printer has IEEE-1284 parallel interface, RS-423 serial interface and USB interface as standard.

1.3.1 Parallel Interface(Forward channel)

Forward channel is the mode to transfer the ordinary printing order to the printer side from the PC side.

	Table 1-6. Parallel I/F
Item	Specification
Transmission mode	8bit parallel, IEEE-1284 compatibility mode
Synchronization	By STROBE pulse
Handshaking	By BUSY and ACKNLG signal
Signal Level	TTL compatible level
Adaptable connector	57-30360(amphenol) or equivalent

BUSY signal is set high before setting either-ERROR low or PE high and is held high until all these signals return to their inactive state.

BUSY signal is set high level in the following cases. -During data entry (see Data transmission timing) -When input data buffer is full

-During -INIT signal is at low level or during hardware initialization -During printer error (See-ERROR signal)

-When the parallel interface is not selected.

ERROR signal is at low level when the printer is in one of the following states.

-Printer hardware error (fatal error) -Paper-out error

-Paper jam error -Ink-out error

PE signal is at high level during paper-out error.

Table 1-7. Connector pin assignment and signals

Pin.	Signal	Return	In/Out	Function Description
No	Name	GND pin
				The strobe pulse. Read-in of data is
1	-STROBE	19	In	performed at the falling edge of this
				pulse.
				The DATA 0 through DATA7 signals
				represent data bits 0-7,
2-9	Data0-7	20-27	In	respectively.Eacj signal is at high when
				data is logical 1 and low level when data
				is logical 0.
10	-ACKNLG	28	Out	This signal is a negative pulse including
				that the printer can gain accept data.
11	BUSY	29	Out	A high signal indicates that the printer
				cannot receive data.
12	PE	28	Out	A high signal indicates paper-out error.
13	SLCT	28	Out	Always at high level when the printer is
				powered on.
14	-AFXT	30	In	Not used.
				This falling edge of a negative pulse or a
31	-INIT	30	In	low signal on this line causes the printer
				to initialize Minimum 50 us pulse is
				necessary.
32	-ERROR	29	Out	A low signal indicates printer error
				condition.
36	-SLIN	30	In	Not used.

Product Description Parallel Interface 14