Specifications

Table 1-11. Connector Pin Assignments and Signal Functions (Cont.)
Pin No. Signal Name
Return
Pin No.
Dir.
Functional Description
14 AUTO FEED-XT
—
IN
If LOW when the printer is initialized, the printer
automatically performs a line feed upon input of the
CR code (Auto LF).
15 Not used.
16
GND
—
Ground for twisted-pair grounding.
17
Chassis GND
—
—
Chassis ground level of printer.
18
Not used.
19 to 30 GND
Ground for twisted-pair grounding.
31
I NIT 16
IN
Pulse (width: 50ws, min., active LOW) input for printer
initialization.
32 ERROR
OUT
LOW indicates an error has occurred in the printer.
33
GND
—
—
Ground for twisted-pair grounding.
34
Not used.
35
OUT
Always HIGH. (Pulled up to +5V through 3.3K ohm
resistor.)
36
SLCT-IN
—
IN
DC l\DC3 control is disabled.
NOTES: 1. “Dir.” indicates the direction of the signal flow as viewed from the printer.
2. “Return Pin No.” denotes a twisted-pair return line.
3. The cable used must be shielded to prevent noise.
4. All interface conditions are based on TTL levels. Both the rise and fall times of all signals
must be less than
0.21.Ls.
5. The AUTOFEED-XT signal can be set to LOW by DIP switch 2-4.
6. The SELECT-IN signal can be set to LOW by jumper 3.
7. Printing tests, including those of the interface circuits, can be performed without using
external equipment by setting DATA 1- DATA 8 pins to the STROBE signal.
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