Quick Help

The knowledgebase is a categorized collection of answers to frequently asked questions (FAQ) and articles. You can read articles in this category or select a subcategory that you are interested in.



 Logger cannot open a COM port

Problem

A device communicates with a computer through a (virtual, USB) serial port. The device frequently sends data to a computer. It occasionally gets incorrectly identified by Windows as a bus mouse, after which the "Microsoft Serial Ballpoint" driver is loaded. Windows blocks the corresponding COM port, and the logger cannot use it. The logger shows the "Device already open" error.

Solution

You need to disable a driver for a serial mouse in the Windows registry.

1. Start regedit.exe

2. Go into the registry and edit the following value:

Location: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\sermouse  
Key: Start  
Value: 3

Alternatively, you may use the following command:

REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\sermouse" /V Start /T REG_DWORD /F /D 4

3. Change "Value" to "4".

4. Reboot computer.

 

FYI:

3 - Manual. Specifies that the service does not start until the user starts it manually, such as by using Device Manager.

4 - Disabled. Specifies that the service should not be started.

 

 
Was this article helpful? yes / no

Article details

Article ID: 89

Category: Data Loggers

Date added: 2019-10-25 11:52:53

Views : 300

Rating (Votes): Article rated 5.0/5.0 (1)