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User Manual
A-5
Parallel port
The printer has a standard unidirectional, byte-wide parallel, synchronous
port. When you use the parallel port, be sure to type this command at the
PC (if LPT1 is not available, use LPT2):
MODE LPT1:,,P
The table shows the parallel port’s connected pins. Other pins are not
connected. Signal names ending with a dash (
–) are asserted low.
Parallel port signal descriptions
Signal name Pin # Return
pin
Signal
source
Description
DSTRB– 1 19 Host Pulsed low for .5 microseconds
minimum; clocks data into printer
DATA1 2 20 Host Positive true data input
DATA2 3 21 Host Positive true data input
DATA3 4 22 Host Positive true data input
DATA4 5 23 Host Positive true data input
DATA5 6 24 Host Positive true data input
DATA6 7 25 Host Positive true data input
DATA7 8 26 Host Positive true data input
DATA8 9 27 Host Positive true data input
ACK– 10 28 Printer Data acknowledge pulsed low for
3-4 microseconds; ends bus
transaction
BUSY 11 29 Printer Positive true = cannot accept data
PE 12 — Printer Positive true = out of paper
SLCT 13 — Printer Positive true = printer selected
INPRIME– 31 30 Host Negative true = printer port reset
FAULT- 32 — Printer Negative true = printer fault
indicator
Frame Gnd — 17 Printer Frame ground
SGnd — 14,16,33 Printer Signal ground