Epson 2250 - Manual (Page 81)

Technical Specifications
Signal
Pin
Direction
32
35
36
Return
Pin
16
Signal
GND
INIT
ERROR
GND
+5v
-
-
IN
OUT
OUT
-
Description
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 a paper-out state
2) in an error state
Same as for pins 19-30.
Not used
Pulled up to 5V through 1.0
resistance.
Not used
Note:
l
The column heading “Direction” refers to the direction of signal flow as
viewed from the printer.
l
“Return” denotes the twisted-pair return, to be connected at signal ground
level. For the interface wiring, be sure to use a twisted-pair cable for each
signal and to complete the connection on the return side.
l
All interface conditions are based on the TTL level. Both the rise and fall times
of each signal must be less than 0.2 microseconds.
l
Data transfer must be carried out by observing the ACKNLG or BUSY signal.
Data transfer to this printer can be carried out only after receipt of the
ACKNLG signal or when the BUSY signal is LOW.
A-10 Appendix