User`s guide

Signal
pin
Return
pin Signal Direction Description
11 29 BUSY OUT A HIGH signal indicates the
printer cannot receive data.
The signal goes HIGH in the
following cases:
1) During data entry
(for each character)
2) During initialization
3) During self test,
demonstration, and
default setting printing
4) During a printer-error state
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 k
Ω
resistance
14 30
AFXT
IN Not used
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 Not used
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 default 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
µ
s at the receiving
terminal.
Pin assignments (continued)
A-10
Technical Specifications