Epson 1170 User Manual page 124

Signal Return
Pin
Pin
11 29 BUSY
30
12
13
14
15 NC
16
17
18 NC
31 16
32
Signal Direction
OUT
OUT
OUT
AUTO IN
FEED
C H A S S I S -
IN
ERROR
OUT
Interface Specifications
Description
A HIGH signal indicates that the printer
cannot receive data. The signal goes
HIGH in the following cases:
2) During printing
3) When PAUSE botton is pressed
4) During printer-error state.
A HIGH signal indicates that the printer is
out of paper.
Pulled up to 5 volts through 3.3 Kohm
resistance.
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 2-4 to ON.)
Not used.
Logic ground level.
Printer's chassis ground, which is
isolated from the logic ground.
Not used.
Twisted-pair return signal ground level.
When this level becomes LOW, the
printer controller is reset to its power-up
state and the print buffer is cleared. This
level is normally HIGH; its pulse width
must be more than 50 microseconds at
the receiving terminal.
This level becomes LOW when the printer
is:
2) PAUSE
3) in error state.
Technical Specifications 7-11