Alarm Lock USB Serial COM Port Reassignment Guide

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OVERVIEW 
When using a USB adapter and DL-Windows, it is possible 
that DL-Windows may not find the adapter due to the USB 
adapter being assigned a COM Port greater then COM4.  To 
change this number, please use the following instructions. 
 
Note:  Although the images that follow were obtained from a 
Windows 98 installation, the procedure is nearly identical with 
Windows 2000, Windows ME and Windows XP installations.   
 
CONFIGURE THE USB PORT 
Click Start > Settings > Control Panel to open the Windows 
Control Panel.   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Double-click the System icon and the System Properties 
dialog opens: 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In the System Properties dialog, click to open the Device 
Manager, and select the View devices by type option.   
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In the Ports (COM & LPT) entry, click the + symbol to dis-
play the devices in this category.   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
As shown above, click to select the entry USB Serial 
Port (this entry is followed by a COM Port number), then 
click on the Properties button to view the device properties. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In the USB Serial Port (COM3) Properties dialog (shown 
above), note the USB Serial Port is set to COM3.   
 
The General tab (shown above) displays a variety of de-
tails including the status of the device selected (the De-
vice status area confirms that the device is--or is not--
USB SERIAL COM PORT  
REASSIGNMENT GUIDE  
						

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working properly with regard to the Windows operating sys-
tem).   
 
Note:  The COM number may vary depending on which de-
vices have been installed prior to plugging in the USB device. 
 
For more device details, click the Port Settings tab: 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Port Settings tab (shown above) displays the USB Se-
rial Port default settings.   
 
Note:  Nearly all Windows operating systems will automati-
cally select the COM port settings required by the device, 
therefore the default values can usually be left as-is. 
 
The most frequent requirement is to change the COM Port 
number.  To do this, click the Advanced... button. 
 
In the Advanced Port Settings dialog (shown below), the 
COM Port Number pull-down menu allows the COM Port 
number to be changed.   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Important:  Before changing the COM Port number, verify 
that the new COM Port number does not conflict with any 
other hardware or USB COM port present in the system by 
checking the existing devices listed in the Device Manager 
dialog (shown previously). 
 
Note:  The Transmit Buffer and Receive Buffer sliding 
pointers are used for hardware COM ports only and will not 
alter the performance of USB COM Ports.