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Signal
Pin
Return
Pin Signal Direction Description
12 28 PE OUT A HIGH signal indicates the
printer is in a paper-out state
or in an error state.
13 28 SLCT OUT Pulled up to +5 V through
1 kΩ resistance
14 30
AUTO
FEED
XT
IN When this signal is LOW, the
paper is automatically fed
one line after printing.
15 — NC — Not used
16 — GND — Logic ground level
17 — CHASSIS
GND
— Printer’s chassis ground,
which is connected to the
logic ground
18 — Logic H OUT Pulled up to +5 V through
3.9 KΩ resistance
19-30 — GND — Twisted-pair return signal
ground level
31 30
INIT IN When this signal goes 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 µs at
the receiving terminal.
32 29
ERROR OUT This signal level goes LOW
when the printer:
1) Is out of paper
2) Is in an error state
3) Has no ink cartridges
installed
33 — GND — Same as for Pins 19-30
34 — NC — Not used
35 — +5 V OUT Pulled up to +5 V through
3.3 KΩ resistance
36 30 SLIN IN Not used
A-10
Technical Specifications