Epson 680Pro Service Manual - Page 15

Table 1-4. Typical Time of tack, Table 1-5. Signal Level: TTL Compatible IEEE-1284 level 1 device

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EPSON Stylus COLOR 680/777/777i Table 1-4. Typical Time of tack Parallel I/F Mode Typical Time of tack High Speed 0.5us Normal Speed 2us Table 1-5. Signal Level: TTL Compatible (IEEE-1284 level 1 device) Parameter Minimum Maximum Condition VOH* - 5.5V VOL* -0.5V - IOH* - 0.32mA VOH = 2.4V IOL* - 12mA VOL = 0.4V CO - 50pF VIH - 2.0V VIL 0.8V - IIH - 0.32mA VIH = 2.0V IIL - 12mA VIL = 0.8V CI - 50pF * A low logic level on the Logic H signal is 2.0V or less when the printer is powered off, and this signal is equal to or exceeding 3.0V when the printer is powered on. The receiver shall provide an impedance equivalent to 7.5K ohm to ground. Revision B Table 1-6. Connector Pin Assignment and Signals Pin No. Signal Name Return GND Pin In/Out Functional Description 1 -STROBE 19 The strobe pulse. Read-in of data is In performed at the falling edge of this pulse. 2 DATA0 20 In 3 DATA1 21 In 4 DATA2 22 In The DATA0 through DATA7 signals 5 DATA3 23 In represent data bits 0 to 7, respectively. Each signal is at high level when data is 6 DATA4 24 In logical 1 and low level when data is 7 DATA5 25 In logical 0. 8 DATA6 26 In 9 DATA7 27 In 10 -ACKNLG 28 Out This signal is a negative pulse indicating that the printer can accept data again. 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. The falling edge of a negative pulse or a 31 -INIT 30 In low signal on this line causes the printer to initialize. Minimum 50us pulse is necessary. 32 -ERROR 29 Out A low signal indicates printer error condition. 36 -SLIN 30 In Not used. 18 Logic H - Out Pulled up to +5V via 3.9 K ohm resistor. PRODUCT DESCRIPTION INTERFACE 15

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EPSON Stylus COLOR 680/777/777i
Revision B
PRODUCT DESCRIPTION
INTERFACE
15
*
A low logic level on the Logic H signal is 2.0V or less when the printer
is powered off, and this signal is equal to or exceeding 3.0V when the
printer is powered on. The receiver shall provide an impedance
equivalent to 7.5K ohm to ground.
Table 1-4. Typical Time of tack
Parallel I/F Mode
Typical Time of tack
High Speed
0.5us
Normal Speed
2us
Table 1-5. Signal Level: TTL Compatible (IEEE-1284 level 1 device)
Parameter
Minimum
Maximum
Condition
VOH*
-
5.5V
VOL*
-0.5V
-
IOH*
-
0.32mA
VOH = 2.4V
IOL*
-
12mA
VOL = 0.4V
CO
-
50pF
VIH
-
2.0V
VIL
0.8V
-
IIH
-
0.32mA
VIH = 2.0V
IIL
-
12mA
VIL = 0.8V
CI
-
50pF
Table 1-6. Connector Pin Assignment and Signals
Pin No.
Signal Name
Return
GND Pin
In/Out
Functional Description
1
-STROBE
19
In
The strobe pulse. Read-in of data is
performed at the falling edge of this
pulse.
2
DATA0
20
In
The DATA0 through DATA7 signals
represent data bits 0 to 7, respectively.
Each signal is at high level when data is
logical 1 and low level when data is
logical 0.
3
DATA1
21
In
4
DATA2
22
In
5
DATA3
23
In
6
DATA4
24
In
7
DATA5
25
In
8
DATA6
26
In
9
DATA7
27
In
10
-ACKNLG
28
Out
This signal is a negative pulse indicating
that the printer can accept data again.
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.
31
-INIT
30
In
The falling edge of a negative pulse or a
low signal on this line causes the printer
to initialize. Minimum 50us pulse is
necessary.
32
-ERROR
29
Out
A low signal indicates printer error
condition.
36
-SLIN
30
In
Not used.
18
Logic H
-
Out
Pulled up to +5V via 3.9 K ohm resistor.