Epson MX-80 Technical Manual page 14

(1)
Connector CN1
(a) Use ................... This connector is used for data exchange between the
MX-80 and an external computer (parallel).
(b) Number of pins ........ 36 pins
(c) Part number ........... 57-30360 (AMPHENOL)
(d) Pin assignment ......... Refer to Table 2.1 below.
Table 2.1 Pin Assignment of
eN
1
Signal Return
Signal
Direction Description
Pin No. Pin No.
1 19 STROBE
In STROBE pulse to read data in. Pulse width must be
more than 0.5j1.s at receiving terminal.
The signal level is normally "HIGH"; read-in of data is
performed at the "LOW" level of this signal.
2 20 DATA 1 In
These signals represent information of the 1 st to 8th
3
21 DATA 2 In
bits of parallel data respectively. Each signal is at
"HIGH" level when data is logical "1" and "LOW"
4 22 DATA 3
In
when logical "0".
5
23 DATA 4 In
6 24
DATA 5 In
7 25 DATA 6 In
8 26
DATA 7 In
9
27 DATA 8 In
10 28
ACKNLG Out Approx. 5/Ls pulse. "LOW" indicates that data has
been received and that the printer is ready to accept
other data.
11
29
BUSY Out A "HIGH" signal indicates that the printer cannot re-
ceive data. The signal becomes "HIGH" in the follow-
I
ing cases:
1. During data entry
2. During printing operation
3. In OFF-LINE state
4. During printer error status.
12 30 PE Out A "HIGH" signal indicates that the printer is out of
paper.
13 - SLCT Out
This signal indicates that the printer is in the selected
state.
14 - AUTO FEED XT In
With this signal being at "LOW" level, the paper is
automatically fed one line after printing.
(The signal level can be fixed to "LOW" with DIP SW
pin 2-3 provided on the control circuit board.)
15 -
NC Not used.
16
-
OV Logic GND level.
17
-
CHASSIS-GND
-
Printer chassis GND.
In the printer, the chassis GND and the logic GND are
isolated from each other.
18
-
NC -
Not used.
19 to 30
- GND - TWISTED-PAIR RETURN signal GND level.
REV. A 2-2