Interfaces - Epson DFX-9000 Service Manual

Epson DFX-9000

1.2.8 Interfaces

This printer provides 4 interfaces as standard: bi-directional 8-bit
parallel, serial, USB, and a Type-B optional interface slot.
1.2.8.1 Parallel interface (forward channel)
Transmission mode: 8 bit parallel, IEEE-1284 compatibility mode
Adaptable connector: 57-30360 (Amphenol) or equivalent
Synchronization: -STROBE pulse
Handshaking: BUSY and -ACKNLG signals
Signal level: TTL compatible (IEEE-1284 level 1 device)
Table 1-18. Parameters
Parameter Minimum Maximum
V
* - 5.5 V
OH
V
* -0.5 V -
OL
I
* - 0.32 mA
OH
I
* - 12 mA
OL
C
- 50 pF
O
V
- 2.0 V
IH
V
0.8 V -
IL
I
- 0.32 mA
IH
I
- 12 mA
IL
C
- 50 pF
I
* Active-High signals are 2.0 V or lower when the printer is off and 3.0
V or higher when the printer is on. The receiver has an impedance
equivalent to 7.5 kΩ.
Product Description
Condition
-
-
V
= 2.4 V
OH
V
= 0.4 V
OL
-
-
-
V
= 0.4 V
OL
V
= 0.8 V
IL
-
Basic specifications
Data transmission timing
DATA Data byte n
-STROBE
t
setup
BUSY
t
t
busy
ready
-ACKNLG
Figure 1-19. Data transmission timing
Table 1-19. Parameters
Parameter Minimum Maximum
t
500 nsec -
setup
t
500 nsec -
hold
t
500 nsec -
stb
t
0 -
ready
t
- 500 nsec
busy
t
- -
reply
t
500 nsec 10 µs
ack
t
0 -
nbusy
t
0 -
next
t
1
- 120 nsec
tout
t
2
- 200 nsec
tin
Notes: 1. Rise and fall time of output signals
2. Rise and fall time of input signals
Revision B
Data byte n+1
t
hold
t
t next
stb
t t t
reply ack nbusy
24