Re: CI-V Problem

Kevin Grantham

Are you using a UBS-to-serial adapter? If so, make sure that the COM port number hasn’t changed. If it has, change HRD or the assigned port so that they match.


Windows may have updated the driver behind your back. You may be using a USB-to-serial adapter for your computer, and it may be using a Prolific chip clone. If that is the case then when Windows updates the driver it can replace it with one that detects the clone chips. It fails as you have described – everything looks good, it gets a COM port, etc. etc. It just won’t pass data.


See if you can “Update Driver” in Device Manager and roll it back to an older one. They are available on Melchior’s web site, and, and other places.



Kevin N5KRG


Join to automatically receive all group messages.