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Table D-3, continued
Return
Signal
Pin
Pin
1 3
-
14
-
1 5
-
1 6
-
1 7
-
18
-
19 - 30
-
3 1
-
3 2
-
33
-
34
-
3 5
-
3 6
-
Notes:
1. The column heading "Direction" refers to the direction of signal
flow as viewed from the printer.
"Return" denotes the twisted-pair return, to be connected at signal
2.
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. To prevent noise, these cables should be shielded and con-
nected to the chassis of the host computer or the printer but not at
both ends.
3. All interface conditions are based on TTL level. Both the rise and
the fall times of each signal must be less than 0.2 microseconds.
Direc-
Signal
tion
OUT
SLCT
NC
-
NC
-
N C
-
C H A S S I S
G N D
-
NC
-
GND
-
INIT
IN
OUT
ERROR
NC
-
NC
-
NC
-
NC
-
Description
Pulled up to + 5 volts through 3.3K
ohm resistance.
Unused.
Unused.
Unused.
Printer's chassis ground, which is
isolated from the logic ground.
Unused.
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 usually HIGH; its
pulse width must be more than 50
microseconds at the receiving
terminal.
This level becomes LOW when the
printer is in:
1) Paper-end state.
2) Off-line.
3) Error state.
Unused.
Unused.
Unused
Unused.
D-5
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