8
RS-232C interface. When it is connected to IBM PC or its compatible machine, connection
can refer to Fig.2-6.
Fig.2-6 Connection between SP-TL51 and IBM PC Serial Interface Sketch Map
2.3.2 Parallel Interface Connection
The parallel interface of SP-TL51 printer is compatible with CENTRONICS, supports
BUSY or ACK handshaking protocol. The pin assignment of 36 PIN parallel interface is as
Fig. 2-7 shows:
Pin No.
Signal
Direction
Description
1
STROBE
In
Gated file-flop, reading data at the rising edge.
2
D1
In
These signals represent the 1st bit to 8th bit of the parallel
data respectively, each signal is at HIGH level when data is
logic 1, and LOW when data is logic 0.
3
D2
In
4
D3
In
5
D4
In
6
D5
In
7
D6
In
8
D7
In
9
D8
In
10
ACK
Out
Response impulse, LOW level signal indicates that data has
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.
