Epson Stylus Color 670, Руководство по обслуживанию

Страница: 16 / 152

EPSON Stylus Color 670 Revision A
Product Description Interface 16
NOTE: * A low logic level on the Logic H signal is 2.0 V or less when
the printer is powered off and this signal is equal or exceeding
3.0V when the printer is powered on. The receiver shall
provide an impedance equivalent to 7.5 K ohm to ground.
Table 1-4. 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 - 50pH
VIH - 2.0V
VIL 0.8V -
IIH - 0.32mA VIH=2.0V
IIL - 12mA VIH=0.8V
CI - 50 pF
Table 1-5. Connector Pin Assignment and Signals (F-Channel)
Pin
No.
Signal
Name
Return
GND Pin
In/Out Function 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 hen 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 again
accept data.
11 BUSY 29 Out
A high signal indicated 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 50 us
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 3.9K ohm resistor.
35 +5V - Out Pulled up to +5V via 3.3K ohm resistor.
Table 1-5. Connector Pin Assignment and Signals (F-Channel)
Pin
No.
Signal
Name
Return
GND Pin
In/Out Function Description