User's Manual

4.2.3 Serial interface
The serial interface of this printer is compatible with RS-232C, use DB25 hole type socket, support
hardware handshaking protocol, the default baud rate and data format are 9600BPS, 8 data bit, no
parity, and 1 stop bit. Below is the pin No of the serial interface socket.
Pin signal definition of serial interface
Pin
No
Signal Name Direction Illumination
2 TXD From printer to PC Send data from printer to PC
3 RXD From PC to printer Printer receive data from PC
20 DTR From printer to PC
When the signal is “negative”, it means that
the printer is “busy” and can not receive
data; While the signal is “positive”, it means
that the printer is “ready” and can
receive the data.
1,7 GND ——— GND
The default baud rate is 9600 BPS and the baud rate can be changed by sending 16 Hex. command 1C
AA 22 XX.
XX: 00 indicates 1200 BPS, 01 indicates 2400 BPS, 02 indicates 4800 BPS,
03 indicates 9600 BPS, 04 indicates 19200 BPS, 05 indicates 38400 BPS.
4.2.4 Parallel interface
The parallel interface of this printer is compatible with CENTRONICS, support BUSY /ACK
handshaking protocol, use DB25 pin type interface.
Pin No. of DB25 pin interface as below
Parallel Interface Pin No.25 Below is the pin signal definition of parallel interface socket:
Pin
No
Signal Name Direction Illumination
1 /STB Input
Select trigger, input data when the signal is at
falling edge.
2 DATA1 Input These signals indicate the parallel data