Advanced UPort 1100 Driver Functions
The utilities of Moxa’s UPort 1100 Series give users a convenient tool for configuring and maintaining UPort
series products. In this section, we introduce the “Fixed-base COM Mode” function that enables users to set
COM names on the host PC.
Enable Fixed-base COM Mode
Moxa’s UPort 1100 series provides the unique Fixed-base COM function that allows users to set a specific
beginning COM port number. Regardless of which UPort is plugged into the host, the COM port numbers for the
UPort’s serial ports will be numbered sequentially—starting with the initial COM port number.
To use “Fixed-base COM Mode,” be sure to check the “Enable Fixed-base COM Mode” check box. Note the
default setting for “Fixed-base COM Mode” is set at disable.
The COM numbers are assigned sequentially, and are not tied to a specific UPort device or USB port number.
For example, let’s assume that you’ve set COM1 as the first COM number that will be assigned. If a UPort 1150
is plugged into your computer’s USB port 1, your computer assigns COM1 to the UPort’s serial port. When the
UPort 1150 is plugged into USB port 2, the computer still assigns COM1 to the UPort’s serial port.
When “Fixed-base COM Mode” is enabled for the first time, all the COM port numbers and serial port
parameters will reset to their default values. You can then set the COM numbers and configuration parameters
to the values needed for your application(s). Note: If you subsequently disable “Fixed-base COM Mode,” all the
parameters will be restored to their original settings.
USB Port 1 USB Port 2
USB Port 2 USB Port 1
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