Epson FX-870 User Manual page 137

Single Return Signal
Pin Pin
11
29
12 30 PE
13
16
32
7-12 Technical Specifications
Direction Description
BUSY
OUT
OUT
SLCT
OUT
IN
ERROR OUT
A HIGH signal indicates that the printer
cannot receive data. The signal goes
HIGH in the following cases:
1) During data entry
2) During input buffer full
3) During printer-error status
A HIGH signal indicates that the printer is
out of paper.
Pulled up to 5V through 3.3 kR
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:
1) in a paper-out status
2) in an error status