Epson 4500 - Manual (Page 245)

Interface
Specifications
Signal
Pin
13
Return
Pin Signal
SLCT
AUTO
FEED
XT
Direction
OUT
IN
Description
Pulled up to + 5 volts through 3.3 Kohm
resistance.
When this signal is LOW, the paper is
automatically fed 1 line after printing. (The
signal level can be fixed to this by setting
DIP switch 2-4 to on.)
Not used.
Logic ground level.
Printer’s chassis ground, which is
isolated from the logic ground.
Not used.
Twisted-pair return signal ground level.
When this level becomes LOW, the printer
controller is reset to its power-up state
and the print buffer is cleared. This level is
normally HIGH; its pulse width must be
more than 50 microseconds at the
receiving terminal.
This level becomes LOW when the printer
is:
1) in paper out state.
2) off line.
3) in error state.
Same as for Pins 19-30.
Not used.
Pulled up to 5V through 3.3 Kohm
1 4
-
1 5
-
NC
-
-
GND
CHASSIS
GND
16
1 7
18
19-30
- -
31 16
NC
GND
INIT IN
32 ERROR OUT
33 GND
NC
- -
34
-
35 OUT
36 SLCT IN IN The DC1/DC3 code is valid only when this
signal is HIGH. (Internal fixing can be
carried out with Jumper J10. The level of
this signal is factory-set to LOW.)
Technical Specifications 8-9