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APPENDIX
C-2. Function for Compatibility Mode
Pin No. Signal Name IN/OUT Function
1 STB IN Signals when data is ready to be read. Signal goes
from HIGH to LOW (for at least 0.5 microsec.) when
the data is available.
2-9 DATA0-7 IN These signals provide the information of the first to
eighth bits of parallel data. Each signal is at HIGH level
for a logical 1 and at a LOW level for a logical 0.
10 ACK OUT OUT LOW pulse acknowledges receipt of the data.
11 BUSY OUT OUT When this signal goes to LOW, the printer is ready
to accept data. When the printer is in one of the
conditions below, “HIGH” is set.
1. Data is being entered
2. Off line
3. Error condition
12 PE OUT OUT This signal indicates the status of the paper sensor.
13 SELECT OUT OUT This signal is HIGH when the printer is online.
14 AUTO IN IN This signals that the printer is processing a paper
feed command from a host computer.
15 NC Unused
16 GND Signal ground
17 FG Chassis ground, isolated from logic ground
18 Logic High
19-30 GND Twisted pair return the signal to ground level.
31 INT IN IN When this signal goes to LOW, the printer is reset to
its power-on condition.
32 ERROR OUT OUT This signal is normally HIGH. This signal goes to
LOW to signal that the printer cannot print due to an
error condition.
33 GND External ground
34 DKSTS OUT
35 Logic High
36 SELECT IN IN Puts printer in Select mode

Parallel interface connector (printer side)

This connector mates with an
Amphenol 57-30360 connector