Dascom DM-220 User Guide - Manual (Page 35)

Tally Dascom DM-210/220
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5.2.3 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” (-3V to -15V), it
means that the printer is “busy” and can not receive
data; While the signal is “positive” (+3V to +15V), it
means that the printer is “ready” and can
receive the data.
1,7 GND ——— GND
Note:
The default baud rate is 9600 BPS and the baud rate can be changed by sending the hexadecimal command “1C
AA 22 XX”.
XX=00 indicates 1200 BPS,
XX=01 indicates 2400 BPS,
XX=02 indicates 4800 BPS,
XX=03 indicates 9600 BPS,
XX=04 indicates 19200 BPS,
XX=05 indicates 38400 BPS.
5.2.4 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