PCI Express Boards Software Installation
• Interface
This column shows the interface of all serial ports. You can change the interface by clicking the port
setting button and make the changes in the “Port Setting” dialog box. (The default setting of the
interface is RS-232)
• Termination Resistor
You may need to enable the termination resistor in the long communication distance.
Enable (120 ohm)
Disable (Default)
• Bias Resistor
In RS-422/485 mode, if you multidrop connections to many devices, it is better to change the bias
resistor to 150 kohm. On the other hand, if you only connect few devices, then it is fine to keep the
default setting (1 kohm).
1 kohm.
150 kohm. (Default)
• Status
If you are in RS-485 mode, click the Start Diagnosis button. It will start the RS-485 diagnostics and
will show results in the status column. You can follow the readout information and adjust the bias
resistor and terminator resistor. For detailed information, please check chapter 4, “Configuring
Intelligent RS-485”.
3. Port Setting:
Click this button, and it will open the port setting window for you to configure the serial ports.
Port Number/Auto Enumerating COM Number
Select a COM number for the port from the Port Number pull-down list. You could also type the port number
in the text column to quickly get the target port.
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