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Connector pinout: DEC Dual RS-232 DEC Dual RS-232 pin name direction description color 1 n/c Not connected 2 TXD Transmit Data 3 RXD Receive Data 4 RTS Ready To Send 5 CTS Clear To Send 6 DSR Data Set Ready 7 GND Ground 8 DCD Data Carrier Detect 9 n/c Not connected 10 n/c Not connected 11 DTR Data Terminal Ready 12 DCD Data Carrier Detect 13 CTS Clear To Send 14 TXD Transmit Data 15 n/c Not connected 16 RXD Receive Data 17 n/c Not connected 18 n/c Not connected 19 RTS Ready To Send 20 DTR Data Terminal Ready 21 n/c Not connected 22 RI Ring Indicator 23 DSR Data Set Ready 24 n/c Not connected 25 RI Ring Indicator