Epson FX-80 User Manual page 339

Table 0·1, continued.
Signal Return
Signal
Direction
Pin# Pin#
12 30 PE OUT A HIGH signal indicates that the
printer is out of paper.
13
-
SLCT OUT Logic HIGH level.
14 - AUTO FEED XT IN When this signal is LOW, the paper
is automatically fed 1 line after
printing. (The signal level can be
fixed to this by setting DIP switch
2·3 to ON.)
15
Unused.
- NC -
16 - OV
- Logic GND level.
17
- CHASSISGND
-
Printer's chassis ground, which is
isolated from the logic ground.
18
-
NC
- Unused.
19 - 30
-
GND
-
Twisted-pair return signal ground
level.
31 - INIT IN When this level becomes LOW, the
printer controller is reset to its initial
state and the print buffer is cleared.
This level is usually HIGH; its pulse
width must be more than 50
microseconds at the receiving
terminal.
32 - ERROR OUT This level becornes LOW when the
printer is in:
1) Paper-end state.
2) Off-line.
3) Error state.
33
-
GND
-
Same as for Pins 19 - 30.
34 - NC - Unused.
35
-
+5V
- Pulled up to + 5V through 3.3K ohm
resistance.
36
-
SLCTIN IN Data entry to the printer is possible
only when this level is LOW; DIP
switch 1-8 is set for this at the
factory.
Notes:
1.
"Direction" refers to the direction of signal flow as viewed from the
printer.
2. "Return" denotes "twisted-pair return" and is to be connected at
signal ground level. For the interface wiring, be sure to use a
twisted-pair cable for each signal and to complete the connection
on the return side. To prevent noise, these cables should be shielded
and connected to the chassis of the host computer and the printer,
respectively.
3. All interface conditions are based on TTL level. Both the rise and
the fall times of each signal must be less than 0.2 microseconds.
4. Data transfer must be carried out by consulting with the ACKNLG
or BUSY signal. (Data transfer to this printer can be carried out
only after configuration of the ACKNLG signal or when the level of
the BUSY signal is LOW.)
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