Author: purtech
Subject: Discovering What is using COM1
Posted: 02 October 2014 at 5:15pm
I need to use COM1 on a Windows 7 Pro 64Bit machine. It is our shipping computer. Dynamics NAV 2013 (for some reason) - or Lanham EShip requires a COM port and not a USB port to read the scale.
Whenever I attempt to read the scale NAV throws and Access Denied message. The scale company has a diagnostic path using Hyperterminal. It too, never communicates with scale.
Both the FedEx and DHL apps can use COM1 but I have made sure they are using USB.
Process Monitor: My first discovery with this showed Lync 2013 as using it. I called MS. They said it does not. I have poured over multiple captures of Process Monitor. What is odd is there is no "Access Denied" in any of the results! I would expect that. I have carefully looked at just NAV's capture (and others) but nothing stands out to me.
Of course I tried PortMon. Error 2.
Working with the Port itself in the Device Manager: at one time it told us is was in use. But not any more. I've rebooted it several time, even checking to see if the BIOS is correct.
I have had another tech from a company that specializes in COM/Serial communications - their devices works with a large number of Windows serial ports attached to specialized Milling machines. He couldn't figure it out, only to say some process is holding the Port open.
The COM settings I have checked more time than I can remember and even set the scale to match. And tried different settings.
So, how can I discover what is holding the Port Open?
Subject: Discovering What is using COM1
Posted: 02 October 2014 at 5:15pm
I need to use COM1 on a Windows 7 Pro 64Bit machine. It is our shipping computer. Dynamics NAV 2013 (for some reason) - or Lanham EShip requires a COM port and not a USB port to read the scale.
Whenever I attempt to read the scale NAV throws and Access Denied message. The scale company has a diagnostic path using Hyperterminal. It too, never communicates with scale.
Both the FedEx and DHL apps can use COM1 but I have made sure they are using USB.
Process Monitor: My first discovery with this showed Lync 2013 as using it. I called MS. They said it does not. I have poured over multiple captures of Process Monitor. What is odd is there is no "Access Denied" in any of the results! I would expect that. I have carefully looked at just NAV's capture (and others) but nothing stands out to me.
Of course I tried PortMon. Error 2.
Working with the Port itself in the Device Manager: at one time it told us is was in use. But not any more. I've rebooted it several time, even checking to see if the BIOS is correct.
I have had another tech from a company that specializes in COM/Serial communications - their devices works with a large number of Windows serial ports attached to specialized Milling machines. He couldn't figure it out, only to say some process is holding the Port open.
The COM settings I have checked more time than I can remember and even set the scale to match. And tried different settings.
So, how can I discover what is holding the Port Open?
