User's Manual

Table F-1. Pins and signals continued
Direc-
tion
OUT
OUT
Signal
Signal
11
Return
Pin
29
BUSY
30
PE
Description
A HIGH signal indicates that the
printer cannot receive data. The signal
goes HIGH in the following cases:
1) During data entry (ea. char. time)
2) During printing
3) When Off-Line
4) During printer-error state
A HIGH signal indicates that the
printer is out of paper.
Pulled up to + 5 volts through 3.3K
ohm resistance.
When this signal is LOW, the paper is
automatically fed 1 line after printing.
(The signal level can be fixed to this by
setting DIP switch 2-4 to ON.)
Unused.
12
13
IN
AUTO FEED
XT
NC
14
15
Logic around level
Printer’s chassis ground, which is
isolated from the logic around.
Unused
OV
CHASSIS
GND
NC
GND
INIT
16
17
18
19-30
31
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 receivinq
terminal.
IN
OUT
This level becomes LOW when the
printer is in:
32
-
ERROR
33
34
35
1) Paper-end state
2) Off-line.
3) Error state.
Same as for Pins 19 - 30.
Unused.
GND
NC
Pulled up to + 5V through 3.3K ohm
resistance.
The DC1/DC3 code is valid only when
this signal is “HIGH”.
-
36 SLCT IN
IN
Notes:
1. The column heading “Direction” refers to the direction of signal
flow as viewed from the printer.
F-4
Technical Specifications