Epson FX-870 Service Manual page 27

Pin Pin Signal
No. No. Name
12 30 PE
13
AUTO FEED In
14
XT
15 NC
16
17 C H A S S I S -
GND
18 NC
GND
9 to 30
31
32 ERROR
GND
33
34 NC
35 --
SLCT
36
Notes: 1. Direction of signal flow is as viewed from the printer.
2. Return means twisted pair return and is to be connected at signal ground
level.
3. Be sure to use a twisted-pair cable for each signal, and always complete the
connection on the return side. To prevent noise effectively, these cables
Epson FX-870/1170
Dir.
Out A HIGH signal indicates that the printer
is out of paper.
Pulled up to +5 V through a 3.3K-ohm
resistor.
When this signal is LOW, paper is
automatically fed one line upon receipt of
a CR code. (This signal level can be set
LOW by default.)
Not used.
Logic GND level.
Printer chassis GND.
In the printer, the chassis GND and the
logic GND are short-circuited.
Not used.
Twisted-pair return signal GND level.
In 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 the HIGH level,
and its pulse width must be more than
50 us at the receiving terminal.
Out The level of this signal becomes LOW
when the printer is in -
1. Paper-out status
2. Error status
Twisted-pair return signal GND level.
Not used.
-
Pulled up to +5V through a 3.3 K-ohm
resistor.
IN In The data between DC3 and DC1 is invalid
when this signal is HIGH. (The level of
this signal is factory set to LOW.)
Printer Features
Description
.
1-15