132
APPENDIX
Connectors and Signals (Parallel Interface)
Pin
No.
Signal Name IN/OUT Function
1 STROBE 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 DATA1-8 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 A 9 microsecond LOW pulse acknowledges receipt of the data.
11 BUSY 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 PAPER OUT OUT
This signal indicates the status of the paper sensor.
[In Star mode]
This signal goes to HIGH when either the TOF or the BOF sensor detects that
there is no paper. The signal will go to LOW when both the TOF and BOF
sensor detect that there is paper installed.
[In the ESC/POS mode]
This signal outputs the status of the sensor selected using the <ESC> “c3”
command.
13 SELECTED OUT This signal is HIGH when the printer is online.
14-15 N/C Unused
16 SIGNAL GND Signal ground
17 CHASSIS GND Chassis ground, isolated from logic ground
18 LOGIC HIGH 3.9 k
Ω
pull-up
19-30 GND Twisted pair return the signal to ground level.
31 RESET IN
This becomes a reset signal when DIP switch 1 is set to ON. (See page 128 for
details.) When this signal goes to LOW (for at least 0.5 microsec.), the printer is
reset to its power-on condition.
32 ERROR OUT
This signal is normally HIGH. This signal goes to LOW to signal that the printer
cannot print due to an error condition.
33 EXT GND External ground
34 COMPULSION OUT Compulsion signal (See page 135.)
35 +5VDC 2.2 k
Ω
pull-up
