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Signal Return
Signal
Direction
Description
Pin Pin
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 printing
3) When the PAUSE button is
pressed
4) During an error state
12
30
PE
OUT A HIGH signal indicates that the
printer is out of paper,
13
SLCT
OUT
Pulled up to 5 V through 3.3
resistance
14
AUTO
IN
When this signal is LOW, the
FEED
paper is automatically fed one
XT
line after printing, (The signal
level can be fixed to LOW by
setting DIP switch 2-4 to on.)
15
NC
Not used
16
GND
-
Logic ground level
17 -
CHASSIS
-
Printer’s chassis ground, which is
GND
isolated from the logic ground
18 -
NC
Not used
19-30
-
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 an and the print buffer is
cleared, This level is normally
HIGH; its pulse width must be
more than 50 at the receiving
terminal.
7-12
Technical Specifications