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Troubleshooting Serial Ports

When setting up serial ports, the software actively prevents you from adding more than one device to a particular port.

  • If the serial connection chosen is an RS-232 connection, and you try to add a second device to that connection, an error message informs you that this connection is already in use by another device.
  • If the serial connection chosen is an RS-485 connection, and you try to add a second device to that connection, an error message informs you that this connection is already being used by another device with a different protocol. It also lets you know that this configuration is not supported and asks if you wish to continue.

NOTE

You have two serial ports on your WebPort, a serial port on each programmable logic controller connected to the WebPort, and either a serial port on your personal computer, or a serial-to-USB adaptor that connects the serial port on a programmable logic controller to a USB port on your computer.

The following table shows the Serial Port RJ-45 Pinouts:

Use the following topics to help you learn about the WebPort and its associated programmable logic devices:

RJ-45 Pin No RS-232 Configuration RS-485/RS-422/Half Duplex RS-485/RS-422/Full Duplex
1 Not used RI (DCE)    
2 Not used CD (DCE)    
3 Not used DTR (DTE)    
4 COM/GND GND GND
5 RxD (DCE)   R+
6 TxD (DTE) T-/R- T-
7 CTS (DCE)   R-
8 RTS/RTR (DTE) T+/R+ T+

Related technical descriptions can be found at:

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