Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Com1 in Ports vs. Com1 in Modems

18 May 2016   #1
byzantine

windows 7 32 bit
 
 
Com1 in Ports vs. Com1 in Modems

Hi, My current challenge is to get a 56K modem working in my new (bought used) desktop running Windows 7. My question is: Is the Com1 referred to in "Ports" in Device Manager the same Com1 that is referred to in "Modems" in Device Manager? Should I have Uninstalled and Reinstalled Com1 in Ports as part of the process of adding the modem? (Getting an error message currently when trying to query the modem). At this point I have not Uninstalled anything. Would it be safe to Uninstall and Reinstall the Com1 in Ports? Before I added the modem there was no entry in Device Manager for Modems, now there is, and it is assigned to Com1. I think there was an entry for Com1 already set up in Ports before I added the modem, but I am thinking I may need to let Windows 7 Ports know that Modems now has a Com1 also. No? Thanks


My System SpecsSystem Spec
.
18 May 2016   #2
fireberd

Windows 10 64 bit
 
 

Have you tried changing the modem to another port? for example COM2 or COM3? You can do that in the Device Manager for the modem.

I have a USB connected RS232C adapter and I had to reassign it to a different port to work properly.
My System SpecsSystem Spec
19 May 2016   #3
byzantine

windows 7 32 bit
 
 

Thanks for the reply. I can click on modems in Device Manager and it tells me the port is Com1 but it won't let me change it.
My System SpecsSystem Spec
.

19 May 2016   #4
rvcjew

7 Pro x64, 10 Pro x64
 
 

Can you give the model of the modem and a screen of its hardware ID? Have you installed any drivers for it besides the ones windows did for you?


Attached Thumbnails
Com1 in Ports vs. Com1 in Modems-hardware-id.png  
My System SpecsSystem Spec
20 May 2016   #5
byzantine

windows 7 32 bit
 
 

Thanks for responding, rvcjew. Device Manager says the hardware ID is "moto1_gen". The actual modem has no brand name on it, but is model number 1456VQH87. The chip is a Conexant RH56D-PCI. After I ran Wizard, drivers that Wizard loaded for the MODEM were windows\system32\drivers\modem.sys and windows\system32\drivers\RootMdm.sys. I noticed the drivers for PORTS are different. They are windows\system32\drivers\serenum.sys and windows\system32\drivers\serial.sys. I have not added any new drivers. I let Wizard do whatever it did. I'm trying to be very sequential and minimalist here, to make it easier for me. I have not yet uninstalled anything. Wondering if doing something with Ports to let Ports know there is a new modem on Com1, would fix things.
My System SpecsSystem Spec
20 May 2016   #6
fireberd

Windows 10 64 bit
 
 

After going back and re-reading your initial post. Many motherboards have a Com port on the motherboard (a motherboard connector) that can be enabled or disabled in the BIOS. If one wanted to use this port you would need the adapter to connect to the jack on the motherboard and provide the RS232C serial connector. Thus the listing in the Device Manager for COM 1 is most likely the com port on the motherboard. If that is the case, it can be disabled in the BIOS.

The Modem listing is separate and is the modem you are trying to attach. Disable the Com (serial) port in the BIOS and then see if that makes any difference with the modem install.
My System SpecsSystem Spec
21 May 2016   #7
byzantine

windows 7 32 bit
 
 

There is a silver box about 1 inch by 1 inch by a half inch that looks like it is connected to the motherboard, which also has a jack input going into it. You can connect a phone line into it from the back of the computer. The port to the silver box looks like a phone jack, but has more fins inside and has a different symbol next to it, but you can click a phone line into it. Maybe this was what the previous owner was using for internet access. He disabled an entry for an ethernet adapter when I told him I would be using a dial up modem. Don't know if he used BIOS or DM to disable it. The entry in dev manager for the disabled device is under Network Adapters: SiS 900-Based PCI Fast Ethernet Adapter. Location is PCI Bus 0, device 4, function 0. DM doesn't say anything about Com ports associated with the adapter, in Resources it says it isn't using any resources because it is not currently enabled. I'm assuming if I enable it, it will say it is assigned to Com1. I'm still back at sqaure 1, trying to make sure the com1 in ports is the same as the com1 in modems. I'm thinking I have to "re-enable" Ports to get Ports to pick up the new assignment for Com1 at the modem, as opposed to the ethernet adapter. Don't know if this helps the discussion, but the location of the Com1 device under Ports is "on PCI standard ISA bridge". I apologize if I have provided a lot of much non-useful information. I'm all for trying to reassign the modem to Com2, if possible. The pc I am currently posting from is using Windows ME and has Ports assigned to Com1 while the modem is assigned to Com2, and works fine. No conflicts. And Device Manager in Win ME lets me click on Modems and change the port. But Modems in Windows 7 will not allow me to change the port. I can, however, In Win 7, go into Ports and change the com port to some other number desired. Maybe I'll change the com port in Ports to Com2 which will take the ethernet adapter away from Com1 and onto Com2, freeing up Com1 for the modem ?? Any risk in trying it?
My System SpecsSystem Spec
21 May 2016   #8
byzantine

windows 7 32 bit
 
 

OK, went ahead and changed Ports to Com2, then got a "conflict" error when querying Modem which is still on Com1. This implies Win 7 wants modem and ports to be assigned to same com port? But in Windows ME I can have modem on com2 and Ports on com1. I give up. Wait, there has to be a way to change the com port assigned to the modem in Win 7. Maybe uninstall and reinstall the modem in Device Manager, and ask for com2 when reinstalling?
My System SpecsSystem Spec
21 May 2016   #9
fireberd

Windows 10 64 bit
 
 

I've changed ports in Win 7 without a problem. I have a USB/RS232C adapter. I've changed to the port number in two different Win 7 desktops. I have the motherboard com port disabled in the BIOS.

The Ethernet adapter is for broadband internet connection (e.g. DSL or cable modem connection). It should have nothing to do with the com port, either the Ethernet adapter enabled or disabled.
My System SpecsSystem Spec
22 May 2016   #10
byzantine

windows 7 32 bit
 
 

From googling, it looks like I have one of those modems that cannot have com port reassigned by Dev Mgr, but can be reassigned by uninstalling and reinstalling the modem and selecting different com port when Wizard asks me. So I will try that now.
My System SpecsSystem Spec
Reply

 Com1 in Ports vs. Com1 in Modems




Thread Tools Search this Thread
Search this Thread:

Advanced Search




Similar help and support threads
Thread Forum
Looking the way to lock use of 3g usb modems
I'm looking a simple way to prevent users in my network to use 3g usb modems (mobile phones and usb sticks that act like a modem) and so navigating bypassing network gateway and firewall. Users are not local admin (now) but preventing installation isn't enough, some user could have configured the...
Network & Sharing
How can I get rid of the yellow exclamation mark against Com1
I've tried cleaning the registry, uninstalling and reinstalling the port then rebooting but it's still there. Looking around the net there appears to be software that claims to be able to fix it but none of it is from MS. So I'm scared to use it. Also tried the MS Mrfixit but it couldnt. Does...
Drivers
I have 2 DSL modems...Can i use one as a switch?
Like the question says? Can i plug one DSL modem into another as a switch? Thanks
Hardware & Devices
Using COM1 over local network
Hi ! I have a POS application.I'm using one thermal printer connected to COM1,I create a bat file wit this command : copy mydata.txt COM1: I run this bat and printer is working fine. I've installed my application on a second computer in the network and I need to print from there to the...
Network & Sharing
COM1 port once available for Visor Prism is now not ...
Hi! My Handspring Prism was working fine with my Win 7 until recently. Now, every time I try to sync it, I get a "The selected port, COM1, is not available at this time. Hotsync manager will open the port when it becomes available." My Device Manager won't tell me what is using COM1 and says...
Hardware & Devices
USB to COM1
Hi is there any app to use a usb device on a COM1 port? i know i can make a cable but i need a software? if theres any out there, im searching and nothing. Thanks
General Discussion


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 01:06.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App