Epson LQ-1050 Technical Manual page 231

Signal Return
Pin No. Pin No.
32
—
33
—
34
—
35
–
36 —
NOTES: 1.
"Direction"
2.
"Return" denotes "TWISTED PAIR RETURN" and is to be connected at signal ground level.
As to the wiring for the interface, be sure to use a twisted-pair cable for each signal and
never fail to complete connection on the return side. To prevent noise, cables should be
shielded and connected to the chassis of the host computer and the printer, respectively.
3.
All interface conditions are based on
must be less than 0.2 ~s.
4.
Data transfer to this printer can be carried out only after confirming the ?iCKIWG signal
or when the level of the BUSY signal is "LOW".
Table A-12. CN1 Pin Assignments (Cont.)
Dir.
Signal
The level of this signal becomes "LOW" when the printer is in:
ERROR o
1. PAPER END state
2. OFF-LINE state
3. Error state
GND — Same as with Pin No. 19 to 30
NC — Not connected
—
—
Pulled up to +5V through 3.3K ohms resister.
SLCT IN The DC1/DC3 code is only valid when this signal is '"HIGH" level.
of the flow is as viewed from the printer.
signal
Description
Both the rise and fall times of each signal
TTL level.
A-30