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CHAPTER 4: OPERATION
Drivers are included on the Compact Disk included with the converter. Simply connect the converter to an available USB port and
insert the CD into the drive. The “Found New Hardware Wizard” will guide you through the installation process. The drivers are not
available via Microsoft Windows Updates. When prompted to connect to Windows Updates to search for drivers, select “No, not at
this time” and follow the instructions for installing from the CD.
When the driver software is installed, the converter will show up in Windows Device Manager as the next available COM port labeled
“RS-485 Port.” Configure the COM port for your application. The default setup is 9600 baud, 8 data bits, no parity, 1 stop bit, no flow
control. The converter will also be listed under USB Controllers.
To uninstall the drivers, follow the instructions contained in the uninstall “read me” file.
Use the IC830A for RS-485 2-Wire systems. In the 2-Wire configuration, the receiver toggles with the transmit data. Bias is provided
by 4.7 KΩ pull-up and pull-down resistors.
Use the IC831A for RS-485 4-Wire systems. In the 4-Wire configuration, the receiver is always active. Bias is provided by 4.7 KΩ pull-
up and pull-down resistors on the receive pair. Bias should be provided on the transmit pair by the end of line slave device.
In most applications, termination is not required. If your application does require termination, it must be installed external to the
converter.
