Setting COM Port USB-Serial

Setting the correct COM Port number when using the Prolific
USB/Serial Adapter with DigiTools
After installing the correct Windows driver for the Prolific USB/Serial Adapter using the
manufacturer’s CDROM, you must assign the device a COM Port number from 1 to 4 in
order to work with the DigiTools software.
WINDOWS XP
1. Select “Control Panel” from the Windows Start Menu and double-click “System” as shown below:-
2. In the System Properties Dialog box, select the “Hardware” tab and then double-click the “Device
Manager” button.
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3. After double-clicking the Device Manager button, the following should appear:-
Look for “Ports (COM & LPT)” on the list of devices. Click on the Ports heading to expand the list of COM
and LPT ports in use. Having connected the USB/Serial Adapter and installed the Windows Driver, you
should see “Prolific USB-to-Serial Comm Port (COM X)” on the list. The COM port number shown (X) is the
default number assigned to the device after installation. If the number shown is either 1,2,3 or 4, there is no
need to change the COM Port number as the DigiTools software works with COM Ports 1 to 4.
If the COM port number shown (X) is a higher value than 4, you must re-assign a COM Port number
between 1 and 4:4. Double-click “Prolific USB-to-Serial Comm Port (COM X)” to view the USB/Serial Adapter’s Properties.
Click on the “Port Settings” TAB and click “Advanced”. From the drop-down box, select a free COM port
number between 1 and 4. Do not select a COM port already shown as being “in use”.
5. Once you have selected a COM port number between 1 and 4, click OK, then Apply on the Properties
dialog box. Remember which COM port number you have assigned, as you will need to select this COM
Port number when using the DigiTools software to communicate with the DigiDash.
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