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Signal
Return
Pin Pin
18
-
19-30
Signal Direction
Description
NC
Not used
GND
-
Twisted-pair return signal ground
level
31
16
-
INIT
IN
When this level becomes LOW,
the printer controller is reset to
its state when the power is first
turned on and the print buffer is
cleared. This level is normally
HIGH; its pulse width must be
more than
50
us
at the receiving
terminal.
32
-
ERROR
OUT This level becomes LOW when:
1)
The paper-is out
2)
The PAUSE button is
pressed
3)
An error occurs
33
-
1
GND
-
Same
as for pins
19-30
34
NC Not used
35
-
Pulled up to 5 V through 1
.O
kR
resistance
36
Note:
NC
Not used
The column heading “Direction” refers to the direction of signal flow as
viewed from the printer.
“Return” denotes the twisted-pair return, 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.
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.
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.
Appendix A-9