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– 15 –
Pin no Signal name
Direction
Function
1 STROBE IN Strobe pulse for data read. Usually HIGH;
goes LOW to trigger data read.
2-9 DATA 1~8 IN Parallel data lines for eight-bit data. HIGH
is “1”; LOW is “0”.
10 ACK OUT Printer outputs this pulse for approxi-
mately 9µs to indicate that data read is
completed. Printer becomes ready to
receive new data at the moment the ACK
pulse ends.
11 BUSY OUT DC-level signal indicating printer’s cur-
rent status. LOW indicates that printer is
ready to receive the next data; HIGH
indicates that printer is unable to receive.
12 PAPER OUT OUT DC-level signal indicating whether printer
has paper. The signal stays LOW while paper
is present; it goes HIGH to indicate that paper
has run out.
13 SELECTED OUT DC-level signal; stays HIGH while printer is
online.
14-15 N/C Not used
16 SIGNAL GND Signal ground
17
CHASSIS GND
Printer-frame ground
18 +5V Outputs +5V (Max. 50mA)
19-30 TWISTED Return pins for various signals. Each pin is
connected to the corresponding signal line by
twisted pair line.
31 RESET IN LOW level causes printer to reset its control
circuitry and return to its initial state.
32 ERROR OUT Goes LOW to indicate that printer is unable to
print.
33 EXT GND Ground terminal for external connection
34-35 N/C Not used
36 – – Fixed “HIGH” at printer side
PARALLEL
PAIR RETURN