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Signal
Return
Pin
Pin
Signal
Direction
Description
14
AUTO
IN
When this signal is LOW, the
FEED
paper is automatically fed
XT
one line after printing.
15
NC
Not used
16
OV
Logic ground level
17
FG
Printer's chassis ground,
which is isolated from the
logic ground
18
+5V
Pulled up to +5V through
3.3 resistance.
19-30
GND
Twisted-pair return signal
ground level
31
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 at the receiving
terminal.
32
ERROR
OUT
This level becomes LOW
when the printer is:
1) In a paper-out or a paper
jam state
2) When the PAUSE button is
pressed
3) In an error state
33
GND
Signal ground
34
NC
Not used
35
+5V
OUT
Pulled up to +5V through
3.3 resistance
36
SLCTIN
IN
The DC1/DC3 codes are
valid only after this signal is
HIGH when the printer is
turned on.
A-12 Technical Specifications