Solution:

Some of the most common problems people encounter when setting up and using I/O drivers are caused by one or more of the following: - Using incorrect or faulty cable connections. To verify your connections, refer to the cable diagram in your hardware documentation. Another test that usually verifies that the cable is correct is to attempt to communicate to the hardware with the programming software through the same cable. If possible, run your programming software on the same computer as the FIX to verify that the port is also functioning correctly. - Failing to match the communication parameters of the process hardware in the channel properties of the I/O Driver Power Tool. For information about appropriate values for these fields, refer to Setting Channel Communication Properties: Baud Rate, Data Bits, Stop Bits, and Parity. - Specifying an incorrect station number for the process hardware in your driver configuration. Review the configuration and your process hardware settings. - Failing to set the correct port number on the Channel properties page. The default value is None. - Setting the write protect switch on the hardware. If the I/O driver reads values but does not write values, make sure the switch is not set. Also, start the Power Tool and verify that the Disable Output option is not enabled for the datablock. - Attempting to communicate to areas of memory not defined in the controller. - Using the same interrupts for a computer expansion board and COM ports 1 and 2. Most personal computers assign IRQ4 to COM port 1 and IRQ3 to COM port 2. If a conflict occurs, change the interrupt of the conflicting expansion board. The most common expansion conflict is the network adapter.