Epson 7600, 9600 service manual Interfaces, Parallel Interface, Compatibility Mode, Specification

EPSON Stylus Pro 7600/9600 Revision A

1.6 Interfaces

1.6.1 Parallel Interface

1.6.1.1 Compatibility Mode

SPECIFICATION

† Transmission mode:	8 bit parallel
† Synchronization:	By STROBE pulse
† Handshaking:	By BUSY and ACKNLG signal
† Signal level:	TTL level (IEEE1284Level 1 device)
† Adaptable connector:	57-30360(amphenol) 36 pin or equivalent

NOTE: It is recommended to use as short an interface cable as possible.

CONNECTOR PIN ASSIGNMENT AND SIGNALS

For these signals, twist-pair wires are used, with the return side connected to the signal ground.

Table 1-53. Connector Pin Assignment and Signals (Compatibility)

Pin No.	Return	Signal Name	In/Out	Function
	GND pin
				The strobe pulse. This signal is normally “HIGH” and
1	19	-STROBE	In	read-in of data is executed after turning “LOW”. The
				pulse width required at the receive end is 0.5 ∝s or
				more.
2	20	DATA0	In
3	21	DATA1	In
4	22	DATA2	In	The DATA0 through DATA7 signals represent data
5	23	DATA3	In	bits 0 to 7, respectively. Each signal is at high level
				when data is logical 1 and low level when data is
6	24	DATA4	In
7	25	DATA5	In	logical 0.
8	26	DATA6	In
9	27	DATA7	In

Table 1-53. Connector Pin Assignment and Signals (Compatibility) (continued)

Pin No.	Return	Signal Name	In/Out	Function
	GND pin
				This signal, when the signal level is “Low”, indicates
10	28	-ACKNLG	Out	that the printer has received data and is ready to accept
				the next data. The pulse width is 1 ∝s or 3 ∝s. (See
				Figure 1-19)
				This signal, when the level is “HIGH”, indicates that
				the printer can not receive data. When the level is
				“LOW”, the signal indicates that the printer can
11	29	BUSY	Out	accept data. This signal turns “HIGH” in one of the
				following cases:
				† During data entry
				† In error status
12	28	PE	Out	This signal, when the level is “HIGH”, indicates
				paper-out error. (Valid when ERROR = “LOW”)
13	28	SLCT	Out	Always at “HIGH” level when the power to the printer
				is on. Pulled up to +5 V via 1.0 kΩ.
14	30	-AFXT	In	Not used
31	30	-INIT	In	The printer is initialized by input of a “LOW” pulse
				whose width is 50 ∝s or more.
32	29	-ERROR	Out	The “LOW” signal indicates that the printer is in error
				status.
36	30	-SLIN	In	Not used
18	--	Logic H	Out	Always at “HIGH” level. Pulled up to +5 V via 3.9
				KΩ.
35	--	+5V	Out	Always at “HIGH” level. Pulled up to +5 V via 1.0
				kΩ.
17	--	Chassis GND	-	Chassis GND.
16,33	--	GND	-	Signal GND.
19-30
15,34	--	NC	-	Not used

Note 1: “-” is prefixed to each signal which is active at “LOW” level.

2:In/Out refers to the direction of signal flow from the printer's point of view.

3:The “return side” means twist-pair return, which is connected to the signal GND. For interface, each signal is connected with a twist-pair wire and the return side is also connected. For protection against noise, this cable is shielded and connected to the chassis GND for each of the center machine and the printer.

4:All the interface conditions are based on the TTL level standard. Each of the rise time and fall time is 0.2 ∝s or less.

5:See Figure 1-19for details of signal timing.

Product Description Interfaces 91