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2.3 Interface
2.3.1 Serial Interface
The serial interface of POS764 printer is compatible with RS-232C, use
DB-25(female) socket, DTR/DSR handshaking protocols.The pin order of the
serial port is as Fig.2-2 shows:
Fig.2-2 Pin Order of Serial Port
The pin assignment of serial interface is shown in Fig. 2-3:
Pin No.
Signal
Name
Direction
Source
Description
1
FG
——
——
Ground
2
TXD
Output
Printer
Printer
transmits
control
code
X-ON/X-OFF and data to host
3
RXD
Output
Host
Printer receives data from host
4
RTS
Output
Printer
The same with 20pins DTR signal
6
DSR
Input
Host
Signal “MARK” means the host is busy
and can not receive data.Signal
“SPACE” means the host is ready to
receive data.
7
GND
——
——
Signal Ground
20
DTR
Output
Printer
Signal “MARK” means the host is busy
and can not receive data.Signal
“SPACE” means the host is ready to
receive data.
For. 2-1 The pin assignment of serial interface
Note: (1)“Source” denotes the source that signal come from;
