It is possible to use mscomm32.ocx in excel vba. If you already have vb on your computer than it works in vba but if you don't, you must do the following. Get mscomm32.ocx and place it in your windows system directory. Get vbctrls.reg off a vb installation cd or internet and save it where you can install it into the registry.

I am using Excel 2007 with VB6.5 programming a small macro to communicate with devices through 2 Com ports. COM1: PC build-in RS232.

Now, go to start-->Pretenzionnoe pisjmo obrazec rk. run and type the word command A dos window will appear. Type C: WINDOWS SYSTEM REGSVR32.EXE C: WINDOWS SYSTEM MSCOMM32.OCX this registers the control ************* (should you wish to unregister it for some reason do this below) C: WINDOWS SYSTEM REGSVR32.EXE /u C: WINDOWS SYSTEM MSCOMM32.OCX ************** Now type regedit in the dos window to start the registry editor. Import vbctrls.reg You may have to restart the computer now.

Hi - I'm an engineer working on trying to control a process using electrical resistance as a feedback. I had a development controller running in Excel VBA communicating with a Fluke 8845A digital multimeter. My pc recently died (for unrelated reasons) and am now attempting to setup the controller on another pc - but no luck. The controller relies upon communicating with the 8845A multimeter through a piece of code written in Excel VBA.

The code uses MSComm to data to the multimeter and recieve data back from it. This is a nice way to run the controller as I can take the data, process it in vba code, store it to the spreadsheet and then directly provide feedback on what to do next to a robot. I followed the process of downloading the MSComm ocx into the windows system folder (& system 32), registering it through reg command prompt, altering licences and this is where it goes wrong. I can't add the mscomm axtive x object to a worksheet in excel.

I get the following messages: Cannot insert object. Can anyone help - I looked at removign the need for the MSComm use by employing some code I've found on-line but am having difficulty in getting this to work - I can open the port and send some data but have errors coming up when I try to read data. I need a solution asap!!!

PS - this is to support a development process - the full production process controller will be programmed by a proper software engineer - not an aero eng! Microsoft Blog (URL 1) recommends replacing MSCOMM32.OCX with API (Application Programming Interface) code and links to a Serial Port Communication page (URL 2) where you can download VB source code to use the API.

May be Microsoft update might have caused this problem. Some say that the older version of MSCOMM32.OCX has had its 'kill bit' set by update 'kb969898' (which was installed on system on 28th June). Suggestions are to roll back the update, download an new version of MSCOMM32.OCX, or use a completely different method to read/write to the serial ports. Excel checks the Registry entry in 2 places for lincense for that control: HKEY_LOCAL_MACHINE SOFTWAR E Classes Licenses and HKEY_CLASSES_ROOT Licenses for 4250E830-6AC2-11cf-8ADB-00 AA00C00905 this controls GUID.

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