９
1
/STB
In
Strobe pulse to latch data,
Reading occurs at falling edge.
2
3
4
5
6
7
8
9
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
DATA8
In
In
In
In
In
In
In
In
These signals represent the 1
st
bit to 8
th
bit of the parallel data
representatively, each signal is
at HIGH level when data is
logic 1, and LOW when data is
logic 0.
10
/ACK
Out
Answer pulse, LOW level
signal indicates that data have
already been received and the
printer gets ready to receive the
next data.
11
BUSY
Out
HIGH level signal indicates that
the printer is BUSY and can not
receive data.
12
PE
Out
HIGH level signal indicates that
paper is end.
13
SEL
Out
Pulling up to HIGH level signal
by a resistor
15
/ERR
Out
LOW level signal indicates that
there has error.
14,16,17
NC
---
No connection
18-25
GND
---
Grounding logical 0 level
Note:
（
1
）
“In” denotes input to the printer
，
“Out” denotes output from the
printer.
（
2
）
Signal level is TTL standard.
Fig.2-6 Pin assignment of DB-25 parallel interface
The pin assignment of 36pin parallel interface is as Fig.2-7 shows:
pin No.
Signal
Direction
Description
