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Windows 7: Serial Port Not Connecting

30 Mar 2015   #1

Win 7 Pro 64 Bit
Serial Port Not Connecting


I'm trying to use a serial port on my PC, the GB board (H97-D3H) has a COM port header and I've used a back panel connector with cable to connect to this. I checked and serial port in enabled in BIOS. The driver is the Microsoft driver serial.sys and claims it is working. I believe the support for the COM header connection is through the chipset. I've downloaded and installed all the latest drivers from Gigabyte. I'm trying to connect to a device to update firmware and connection is via serial connection.

Any suggestions for troubleshooting? Would I need a specific driver that supports the chipset to run this serial port? Lots of USB-serial and virtual serial port drivers found by googling but can't find another driver for Win7 x64 to try. Any other suggestions on how to get the device to connect?
My System SpecsSystem Spec
30 Mar 2015   #2

Windows 7 Pro-x64

I tagged in on this post just because I'd like to know too. I've never been able to get a serial port working on Windows 7 and I'm not exactly a newbie. :) I have a USB to serial adaptor I'd like to use for a printer. I know the printer works because I've used it on a weighing scale. And the last time I posted on the subject, the response was pretty slim.
My System SpecsSystem Spec
01 Apr 2015   #3

Win 7 Pro 64 Bit

OK finaly got it going I installed serialmon which is a port monitor which didn't seem to do anything but installed a driver hhdspmc64.sys and after that I was able to connect. However I did sequence it differently when I tried, that is connect to the port then plug in and power on the device, rather than attaching, powering then trying to connect, so might have connected any way.

Note that I connected a port to the COM header on my motherboard and apparently the chipset supports the serial port on my H97 Gigabyte board, so it is not adding a PCI/PCI-E addin card and it is not running a USB-Serial converter. So drivers etc are probably different.

To Carwiz, I see your Intel DH67BL-B3 board does not have a serial header on the board so you can't use my solution. My H97-D3H board has as did a cheapy B75-D3H board I built a system from recently to which I added a back panel connector like this:

Startech COM 9 PIN Serial Male TO 10 PIN Motherboard Header LP Slot Plate 0065030831383 | eBay

the other option is $5 (+/-) PCI or PCI-E addin card from Ebay and find a driver online that works with Win7. Might take a bit of searching but they are out there, most only come with drivers up XP or Vista.

Or if you really need to run the device, buy a card that incudes win7/8 drivers like:

PCI Express Serial Card - 2 Port | 16550 UART | Includes Half-Height Bracket |

Presumably you could return it if you couldn't get it running. The USB-serial port things often only support up to XP, I tried a recommended model model for my device on a Win8 laptop and no joy, wouldn't communicate. I think you might be trying to marry together a serial driver and a USB driver which varies depending on which computer you hook it up to.

Good luck!
My System SpecsSystem Spec

02 Apr 2015   #4

Windows 7 Pro-x64

Yeah, I don't know if I can get another card in unless I rearrange or remove the TV card expansion slot plates. It's pretty full back there. :)

My System SpecsSystem Spec

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