Epson Photo750 manual Typical Time of Tack, Parallel I/F Mode Typical time of tack

EPSON Stylus Photo 750 Revision A

NOTE: Following lists “Notes” when using the parallel interface.

1.“Return GND pin” in the table means twist pair return and is connected to the signal GND level.

Also, these cables are shielded wires and it is effective means to connect to each chassis GND in the PC and printer for electrostatic noise.

2.Conditions for interface are based on TTL level. Rise and fall time should be within 0.2∝s.

The figure below shows the timing chart of the parallel interface.

D A T A			d a t a b			y t e n		d a t a	b y t
				t
					h o l d
/ S T R B
		t					t
		s e t u pt
				s t b			n e x t
B U S Y
	t		t
		r e a dbyu s y

3.Refer to figure1-9 for transmission of timing of each signals.

4.Do not perform data transmission ignoring -ACK or BUSY signals. (Perform the data transmission after confirming that -ACK and BUSY signals are Low)

5.It is possible to perform the printing test including interface circuit without using equipment from outside when 8-bit data signal(20-27 pin) is set to appropriate word code and connect then forcefully to -ACK and -STRB. However, to perform this, it is necessary to set “Parallel I/F mode” of EEPROM as normal. Also, set the IEEE-1284.4 packet mode Off.

/ A C K

t t t

r e p l y a c k n b u s y

t t - o u t M a x . 1 2 0 n s : R is e a n d f

t t - in M a x . 2 0 0 n s : R is e a n d

Figure 1-9. Timing Chart

Typical time of tack is shown below.

Table 1-10. Typical Time of Tack

Parallel I/F Mode	Typical time of tack
High speed	0.5 ∝S
Normal speed	2 ∝S

Product Description Parallel Interface 17