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COM PORTS

Community Veteran
Posts: 8,551
Thanks: 946
Fixes: 9
Registered: ‎02-08-2007

COM PORTS

Is it possible for a COM port to be closed & if so where in the registery would you go to open it.
My problem is that I am trying to update some software on my DVD player  (Humax PVR)
Have got the necessary files and a USB to RS232 Null cable to transfer the software.
The cable shows up in the COM port as  USB-serial  CH340 (COM 3) but in no way will it try to transfer the file.
I Have been on the Humax website, Digital Spy & AV forums but have come to the conclusion the problem rests with my computer.
Drivers came with the cable and there are no yellow or red flags in Device manager.
Anyone got any ideas ?
Using Windows XP
4 REPLIES
Community Veteran
Posts: 6,735
Thanks: 12
Registered: ‎02-02-2008

Re: COM PORTS

What software are you using that is accessing the port?
(that could be the limitation if it will only access "real" serial ports)
Superuser
Superuser
Posts: 6,814
Thanks: 880
Fixes: 56
Registered: ‎30-07-2007

Re: COM PORTS

Looks like a few people have had problems with similar CH340 units getting the correct drivers , have you seen this ?
http://www.davesdrivers.com/forum/showthread.php?tid=130&page=5
Community Veteran
Posts: 4,890
Thanks: 129
Fixes: 24
Registered: ‎14-07-2009

Re: COM PORTS

I'm amazed to see something still being sold with an RS232 port - I thought they had been phased out years ago.  They were always temperamental and awkward when used for instrument control.
Community Veteran
Posts: 8,551
Thanks: 946
Fixes: 9
Registered: ‎02-08-2007

Re: COM PORTS

Have given up on the CH 340 and ordered a prolific chip set so hopefully that will do the trick.
No option about using the Com port as the DVD has a RS 232 connection (what a nightmare)