Interface Specifications - Epson LQ-500 User Manual

Interface Specifications

Your printer is equipped with a parallel interface.
Pin assignments for the parallel interface
Connector pin assignments and a description of their respective
interface signals are shown in the following table.
signal Return
Pin
Pin
1
19
2
20
3 21
4 22
5
23
6
24
7
25
8 26
9 27
10 28
11 29
12 30
Signal Direction
STROBE
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
DATA 8
ACKNLG OUT
BUSY OUT
PE
OUT
IN STROBE pulse to read data. Pulse
width must be more than 0.5
microseconds at the receiving
terminal.
These signals represent information
IN
IN of the 1st to 8th bits of parallel data,
IN respectively. Each signal is at HIGH
IN level when data is logical 1 and
LOW when it is logical 0.
IN
IN
IN
IN
About an 11-microsecond pulse.
LOW indicates that data has been
received and that the printer is ready
to accept more data.
A HIGH signal indicates that the
printer cannot receive data. The
signal goes HIGH in the following
cases:
1) During data entry (ea. char. time)
2) During printing
3) When off line
4) During printer-error state
A HIGH signal indicates that the
printer is out of paper.
Technical Specifications 5-7
Description