GENERAL DESCRIPTION
REV.-A
Pin No.
Signal Name
12
PE
13
SLCT
14
15
16
17
18
19 - 30
31
INIT
32
33
34
35
36
NOTES:
1.
2.
3.
4.
5.
6.
7.
Table 1-9
Connector Pin Assignments and Signal Functions (Cont.)
AUTOFEED-XT
GND
Chassis GND
GND
Return
Pin No. Dir.
30
out
Functional Description
“HIGH” indicates paper out. This signal is effective
only when the ERROR signal is “LOW.”
-
out
Always “HIGH” output. (Pulled up to +5 V through
3.3K-ohm register.)
-
In
If “LOW” when the printer is initialized, a line feed is
automatically performed when the carriage return (CR)
code is received (auto LF).
Not used.
Ground for twisted pair grounding.
- -
Chassis ground level of printer.
Not used.
16
In
Grounds for twisted pair grounding.
Pulse (width: 50
ps,
minimum, active “LOW”) input for
1
printer initialization.
ERROR
-
out
“LOW” indicates an error occurred in the printer.
GND
- -
Ground for twisted pair grounding.
SLCT-IN
-
-
-
-
out
In
Not used.
Always “HIGH.” (Pulled up to +5 V through 3.3K-ohm
register.)
If “LOW,” when printer is initialized, DC1/DC3 control
is disabled.
“Dir.” refers to the signal flow direction as viewed from the printer.
“Return” denotes a twisted-pair return line.
The cable used must be shielded to prevent noise.
All interface conditions are based on TTL levels. Both the rise and fall times of all signals must
be less than 0.2
p.s.
The AUTO FEED-XT signal can be set to LOW by DIP switch 2-4.
The SELECT-IN signal can be set to LOW by jumper 10.
Printing tests, including those of the interface circuits, can be performed without using external
equipment by setting DATA 1-8 of the interface connector to certain codes and connecting the-
ACKNLG signal to the STROBE signal.
1-14
LQ-510
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