Epson SQ-2550 User Manual page 236

ERROR
32
GND
33 -
NC
34
35
36 SLCT IN
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.
This level becomes LOW when the
OUT
printer is:
1) in paper out state.
2) off line.
3) in error state.
Same as for Pins 19-30.
Unused.
OUT Pulled up to +5V through 3.3K ohm
resistance.
The DCl/DCS code is valid only
IN
when this signal is HIGH. (The same
effect can be achieved by setting
SelecType.)
Technical Specifications 8-11
ecomes LOW, the