MSComm Timeout

Posted on 2003-12-02
Last Modified: 2008-02-01

I have an VBA application that talks to a serial device, which acts as a converter and talks to another device. I would like a way for the application to timeout if it doesn't recieve a response in a certain period of time.

The trouble with the timeouts built in to mscomm (that I know of) is that they will only detect if the serial device is there when the app is transmitting, but I need to know if the third device is not responding.

Thanks and sorry if I wasn't clear enough.
Question by:Dormouse31
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2

Accepted Solution

mazfar earned 125 total points
ID: 9862756
I dont know if it answers your question but its a kind of work around.

Put a timer control and set it to whatever is your max waiting time at the port. Whenever you do a serial port open, activate the timer. When the specified interval passes, the timer event will fire and you can close the port (or do whatever u want to here). In the MSCOMM oncomm event, reset the counter (so as whenever you receive anything timer starts again).

I hope I was able to explain my solution.


Author Comment

ID: 9863085
I thought of the timer idea, but there isn't a timer in the VBA toolbox. How do you use a timer in a VBA App?

Expert Comment

ID: 9869740
Check this link to use timer API to replicate timer functionality in VBA.

Have a nice day.
LVL 29

Expert Comment

ID: 10212185
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Answered mazfar
Please leave any comments here within the next seven days.


EE Cleanup Volunteer

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When trying to find the cause of a problem in VBA or VB6 it's often valuable to know what procedures were executed prior to the error. You can use the Call Stack for that but it is often inadequate because it may show procedures you aren't intereste…
Article by: Martin
Here are a few simple, working, games that you can use as-is or as the basis for your own games. Tic-Tac-Toe This is one of the simplest of all games.   The game allows for a choice of who goes first and keeps track of the number of wins for…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question