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Signamax 065-7841 24-Port 10/100/1000BaseT/TX Managed Switch Appendix B Null Modem Cable Specifications The DB-9 cable is used for connecting a terminal or terminal emulator to the Managed Switch’s RS-232 port to access the command-line interface. The table below shows the pin assignments for the DB-9 cable. Function Carrier Receive Data Transmit Data Data Terminal Ready Signal Ground Data Set Ready Request To Send Clear To Send Mnemonic CD RXD TXD DTR GND DSR RTS CTS Pin 1 2 3 4 5 6 7 8 9 Pin Null Modem Cable CD DSR DTR RXD TXD GND RTS CTS Reserve 1 6 4 2 3 5 7 8 9 4 1 6 3 2 5 8 7 9 313 DTR CD DSR TXD RXD GND CTS RTS Reserve Publication date: March 2010 Revision 1.0