Connector Pin Assignments; Monma Board - Epson LQ-1050 Technical Manual

Thes section describes the
Use: To connect the printer to the host computer.
Number of Pins: 36
Return
Signal
Pin No. Pin No.
1 19
20
2
3 21
4 22
23
5
6 24
7 25
8 26
9 27
10 28
11 29
12 3 0
13 —
—
14
—
15
—
16
—
—
18
19 - 3 0 —
31 —
PIN ASSIGNMENTS
connector pin assignments in the electric circuit boards.
Table A-1 2. CN1 Pin Assignments
Dir.
Signal
STROBE pulse to read data in. Pulse with must be more than 0.5 IJS
STROBE
at receving terminal.
DATA 1
I
These signals represent information of the 1'st to
data, respectively. Each signal is at "HIGH" level when data is logical,
I
DATA 2
"1" and "LOW" when logical "O".
I
DATA 3
DATA 4 I
I
DATA 5
DATA 6
DATA 7 I
I
DATA 8
Approx. 11 KS pulse. "LOW" indicates that data has been received
ACKNLG o
and that the printer is ready to accept other data.
BUSY o A "'HIGH" signal indicates that the printer can not receive data. The
signal becomes "HIGH" in the following cases:
1. During data entry
2. During printing operation
3. In OFF-LINE state
4. During printer error state
PE A "HIGH" signal indicates that the printer is out of paper.
o
SLCT — Pulled up to +5V through 3.3K ohms resister.
With this signal at "LOW" level, the paper is automatically fed one
AUTO FEED
line after printing. (The signal level can be fixed to "LOW" with DIP
SW2-8.)
Not used.
—
Logic GND.
—
CHASSIS — Printer chassis GND. In the printer, the chassis GND and the logic
NC —
Not connected
— TWISTED-PAIR RETURN signal GND level.
INIT I When the level of this signal becomes "LOW", the printer controller
is reset to its initial state and the print buffer is cleared. This signal
is normally at "HIGH" level, and its pulse width must be more than
50 ps at the receiving terminal.
Description
—
A-29
8'th
bits of parallel