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SPRT
8
The pin assignment of 36pin CENTRONICS (female) socket is as
following:
Pin
No.
Signal
Direction
Description
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
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
running out.
13
SEL
Out
Pulling up to HIGH level signal by a resistor
indicates that the printer is on line.
32
/ERR
Out
Pulling up to HIGH level signal by a resistor
indicates that there is no error.
34-36
NC
---
No connection
19-30
GND
---
Grounding logical 0 level
The timing chart for interface signal of parallel interface is as Fig.2-6
shows:
Fig.2-6 Signal Timing Chart of Parallel Interface
BU SY
/A CK
DA TA
/S TB
0. 5μS
0. 5μS
0. 5μS
0. 5μS
0. 5μS