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(14) RS-232 Interface pin configuration
Host Function 9 Pin 25 Pin 9 Pin Printer Function
1 +5V
RxD 2 3 2 TxD
TxD 3 2 3 RxD
DTR 4 20 4 DSR
GND 5 7 5 GND
DSR 6 6 6 RDY
RTS 7 4 7 N/C
CTS 8 5 8 RDY
9 +5V
(15) Connector Pin Ass ignment and Signal Description
Pin No. Signal
Name Function Signal Direction
1 +5V Provide the power of 5V
2 TxD Transmit data Printer →
3 RxD Receive data ← Host
4 DSR Data set ready ← Host
5 GND General Ground
6 RDY Printer ready Printer →
7 N/C Not connected
8 RDY Printer ready Pr inter →
9 +5V Provide the power of 5V