Appendix
73
T
ro
ubl
es
ho
oting
The printer has a parallel interface for connecting to the PC.
Shape of Connector
Signal lines and pin assignment
*Signal used for bidirectional communication
Signal functions
Parallel Interface Connector
No.
I/O
Signal name
No.
I/O
Signal name
1
I
/STB
19
-
GND
2
I/O
DATA0
20
-
GND
3
I/O
DATA1
21
-
GND
4
I/O
DATA2
22
-
GND
5
I/O
DATA3
23
-
GND
6
I/O
DATA4
24
-
GND
7
I/O
DATA5
25
-
GND
8
I/O
DATA6
26
-
GND
9
I/O
DATA7
27
-
GND
10
O
/ACK
28
-
GND
11
O
BUSY
29
-
GND
12
O
PE
30
-
GND
13
I
SELECT
31
I
/INIT
14
O
/AUTOFD*
32
O
/FAULT
15
-
Not Used
33
-
Not Used
16
-
GND
34
-
Not Used
17
-
GND
35
-
Not Used
18
O
VCC
36
I
/SELIN*
Signal name
Function
/STB
Signal for sending data to printer.
Steady-state value is
High
.
Printer reads data until this signal becomes from
Low
to
High
.
DATA0 to DATA7
Input signal for receiving 8-bit data.
Logic 1 is
High
.
DATA0
is
LSB
and
DATA7
is
MSB
.
/ACK
Signal indicating that printer has read data into device completely.
This signal is output in response to
/STB
.
18
1
36
19
