Epson LG1-1070 Service Manual page 23

Table 1-11. Connector Pin Assignments and Signal Functions (Cont.)
Pin No. Signal Name
14 AUTO FEED-XT
15
16
17 Chassis GND
18
I NIT
31
32 ERROR
33
34
35
36
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
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.
Return
Dir.
Pin No.
—
IN
—
—
—
16
IN
OUT
— —
OUT
—
IN
signal can be set to LOW by DIP switch 2-4.
1-15
Functional Description
If LOW when the printer is initialized, the printer
automatically performs a line feed upon input of the
CR code (Auto LF).
Not used.
Ground for twisted-pair grounding.
Chassis ground level of printer.
Not used.
Ground for twisted-pair grounding.
Pulse (width: 50ws, min., active LOW) input for printer
initialization.
LOW indicates an error has occurred in the printer.
Ground for twisted-pair grounding.
Not used.
Always HIGH. (Pulled up to +5V through 3.3K ohm
resistor.)
DC l\DC3 control is disabled.