9
3
RXD
Host
Printer receives data from host
6
DSR
Printer
The same as CTS
8
CTS
Printer
When this is “MARK” status, it
means the printer is “busy” and
can’t receive the data. When
this is “SPACE” status, it means
the printer is “ready” to receive
the data.
5
GND
——
Signal Ground
2.3.2 Parallel Interface
The parallel interface of POS88VI printer is compatible with CENTRONICS,
supports BUSY or ACK handshaking protocol,
The pin assignment of 36PIN parallel interface is as Fig. 2-5 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
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
