Epson FX-85 User Manual - Page 88

ground level. For the interface wiring, be sure to use a twisted-pair

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Table K-1, continued Signal Return Signal 13 -- 14 - AUTO FEED XT 15 - 16 - 17 - 18 - 19 - 30 - 31 - NC OV CHASSIS GND NC GND INIT 32 - ERROR 33 - GND 34 - NC 35 - - 36 - SLCT IN Direction Description - Pulled up to + 5 volts through 3.3K ohm resistance. When this signal is LOW, the paper is IN automatically fed 1 line after printing. (The signal level can be fixed to this by setting DIP switch 2-4 to ON.) - Unused. - Logic ground level. Printer's chassis ground, which is - isolated from the logic ground. - Unused. - Twisted-pair return signal ground level. IN When this level becomes LOW, the printer controller is reset to its powerup 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. OUT This level becomes LOW when the printer is in: 1) Paper-end state. 2) Off-line. 3) Error state. - Same as for Pins 19 - 30. - Unused. - Pulled up to + 5V through 3.3K ohm resistance. IN Data entry to the printer is possible only when this level is LOW; DIP switch 2-1 is set for this at the factory Notes: 1. The column heading "Direction" refers to the direction of signal flow as viewed from the printer. 2. "Return" denotes the twisted-pair return, 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 or the printer. 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. 334

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Table K-1, continued
Signal
Return
Signal
Direc-
tion
Description
13
—
—
—
Pulled up to + 5 volts through 3.3K
ohm resistance.
14
—
AUTO FEED
When this signal is LOW, the paper is
XT
IN
automatically fed 1 line after printing.
(The signal level can be fixed to this by
setting DIP switch
2-4 to ON.)
15
—
NC
—
Unused.
16
—
OV
—
Logic ground level.
17
—
CHASSIS
Printer's chassis ground, which is
GND
—
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 power-
up 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
33
—
GND
34
—
NC
35
—
—
36
—
SLCT IN
OUT This level becomes LOW when the
printer is in:
1) Paper-end state.
2) Off-line.
3) Error state.
—
Same as for Pins 19 - 30.
— Unused.
—
Pulled up to + 5V through 3.3K ohm
resistance.
IN
Data entry to the printer is possible
only when this level is LOW; DIP
switch 2-1 is set for this at the factory
Notes:
1. The column heading “Direction” refers to the direction of signal
flow as viewed from the printer.
2. “Return” denotes the twisted-pair return, 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 con-
nected to the chassis of the host computer or the printer.
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.
334