Epson DFX 8000, Service Manual

Page: 34 / 292

General Description
Table Pin Assignments for the Parallel (continued)
Slgnal Return
No. No. Slgnal
31 I When the level of this signal becomes LOW, the
printer controller is reset to its initial state and the
print buffer is cleared. This signal is normally HIGH
and its pulse width must be more than 50
at the
receiving terminal.
32 -ERROR 0 The level of this signal becomes LOW when the
printer is in:
l
A paper end state
l
An off line state
l
An error state
33
GND
Same as for pins 19 to
34
NC
Not connected.
35 Pulled up to V through 3.3 K ohm resistor.
36 IN
I The code is valid only when signal is
HIGH. Internal fixing is possible with jumper
Notes:
l
The direction of the signal flow (l/O) is as viewed from the printer.
l
Return denotes the twisted pair return and is to be connected at signal ground level. For interface
wiring, be sure to use a twisted-pair cable for each signal and always complete the connection on
the return side. To prevent noise, cables should be shielded and connected to the chassis of the
host computer and the printer, respectively.
l
All interface conditions are based on the level. Both the rise and fall times of each signal
must be less than 0.2
l
Data transfer to this printer can be carried out only after confirming the -ACKNLG signal or when
the level of the BUSY signal is LOW.
l
If the proper character codes are sent over the DATA 1 to 8 lines of the interface connector (open
should be “1” and short to GND should be “0”) and the ACKNLG pin is connected to the STROBE
pin, test printing (including the interface circuit) can be performed without external equipment.
l
A short interface cable is recommended to reduce noise.
l
See Table 1-7 for control.
DFX-8000 1-23