10.3 PIN FUNCTIONS ON INTERFACES
l Parallel Interface
Eight-bit character data.
DATA8 is the most significant
bit; DATA1 is the least
significant bit. High is logic 1
and Low is logic 0.
receipt of data.
11 1 BUSY 1 OUT 1 Low when the printer is ready
to accept data. -
12 PAPER OUT Goes High if the printer runs
OUT out of paper.
13 SELECTED OUT High when the printer is on line
14-15 N/C Unused
16 SIGNAL Signal ground.
GND
17 CHASSIS Printer’s chassis ground,
GND
1,8 +SVDC
19-30 GND
OUT
isolated from signal ground.
External supply of +SVDC
Twisted pair return signal
._ .
I ’ Signal
Pin No. XT
31 RESET IN
32 ERROR OUT
ground level.
Low input resets the printer to
its power-on condition.
Goes low to signal that the
printer cannot print due to an
error condition.
101