USB RS485 Vista registry error

[Carel]

Hello,

After working for 1 day with the NI USB .. RS485 converter, it stopped working after a shutdown of the computer. Looking under <control panel><device manager> I see that the device status gives a registry error 19.

The registry error appears also on all other communication ports, ergo all other communication ports stopped working too.

Any ideas how to fix this? (restore point is not working)

Carel

[ninlmartijn]

Dear Carel,

thank you so much for your post on our webforum. I'm sorry for the problems with the RS485 convertor. Which NI serial driver are you using? It is best to uninstall the NI serial driver, the latest version can be found here .

Maybe you can delete the registry wit the regeditor;  

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\VID_3923&PID_717B

where 717B is device specific. Please start cmd.exe and type regedit <Enter>. I found also thi KB on the microsoft site , instead of looking to a CD rom drive you can look for the NI interface (is specified in the right window). But we have to be carefull with deleting registries.

I couldn't find much information about your problem. If this doesn't resolve, please reply information about the version of NI serial, version of Vista (service pack) and type of hardware (type computer) you are using.

Best regards,

[Carel]

Hello Martijn,

I did remove the driver which came with the converter and installed the latest 3.5 driver, however I did this after I encountered the code 19 problem.

After solving user rights problem which made it impossible to remove certain registry entries, I was able to remove the VID entries in the registry. However this did not cure the patient.

As far as I understand it, the problem which was most likely caused by the NI driver now has corrupted something in the serial communication section as it occurs with every converter I tried, even a PCMCIA RS232 card is not working any more so this is really beyond my Windows knowledge.

operating system : Windows Vista Home Premium Service Pack 2

hardware : MSI VR601 laptop

Carel

[Carel]

Hello Again,

I finally found the solution in the Vista registry for Ports (COM & LPT);

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Class/{4D36E978-E325-11CE-BFC1-08002BE10318}

The UpperFilters  was set to hhdserial

After removing hhdserial everything is working again!

Carel

[ninlmartijn]

Hello Carel,

that is great news, thanks for sharing also.

I was still looking into similar registry errors on the web. There are a lot examples with CD / DVD Rom players (like the link to the Microsoft KB). I wanted to be careful with changing things in your registries (and destroying your software installation).

Great that things worked out!

Best regards,