8
(2)Logical signal level is EIA.
The baud rate and data structure under serial interface mode is 9600bps, 8-bit
data bits, no parity and 1 stop bit.
The serial interface of POS764 can be connected to standard RS-232C
interface. When it is connected with IBM PC or its compatible machine,
connection can accord to Fig.2-3.
Fig.2-3 Sketch Map of Connection between POS764 and PC Serial Interface
2.3.2 Parallel Interface
The parallel interface of POS764 printer is compatible with CENTRONICS,
supports BUSY or ACK handshaking protocol.
The pin assignment of 36PIN parallel interface is as Fig. 2-4 shows:
Pin No.
Signal
Direction
Description
1
STROBE
In
Strobe pulse to latch data, Reading occurs at falling
edge.
2
D1
In
These signals represent the 1st bit to 8th bit of the
parallel data representatively, 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
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
