topic Re: Project select data from the serial port in LabVIEW

Project select data from the serial port

baicy — Tue, 08 Mar 2011 15:28:52 GMT

Hi everyone,

The project is about use labview to receive data from a serial port wirelessly. The serial port will receive two values (X1 and X2) every 10 minutes. I want to use those two values as two inputs for my formula. How to make selection? Many thanks.

Baicy

Re: Project select data from the serial port

RavensFan — Tue, 08 Mar 2011 15:45:41 GMT

You have to figure out how to parse the serial data coming in. We can't figure that out for you without seeing an example of what the serial string looks like.

Re: Project select data from the serial port

Coq_Rouge — Tue, 08 Mar 2011 16:12:28 GMT

I suggest you take time to study some of the free Labview course material.

Re: Project select data from the serial port

baicy — Tue, 08 Mar 2011 16:12:58 GMT

Thank you very much, Ravens Fan.

Actually, I can control the serial string coming in.

For example, the string can be send as % 000000A1 0000000A2 * , which start with % and end with *

Or I can send the string like this % 000000A1 \r\n 0000000A2 *

All I need to do is to seperate those two data and use each one as correct input for the formula.

Any idea how to achieve that? many thanks.

Baicy

Re: Project select data from the serial port

RavensFan — Tue, 08 Mar 2011 17:17:33 GMT

Scan From String.

Using the first option, and putting some numbers in for the zeroes so it shows some kind of meaningful result.

Re: Project select data from the serial port

baicy — Wed, 09 Mar 2011 14:40:09 GMT

Hi Ravens Fan,

Many thanks for your help. You are the best.

If the input string is not the exactly the format string by using the Scan From String Function, will these un formatted string be discarded?

Again, many thanks,

Baicy

Re: Project select data from the serial port

RavensFan — Wed, 09 Mar 2011 14:45:48 GMT

Possibly. It depends on how much different the string is. For example, extra characters at the end will be discarded. But if the function has a difficult time decoding the string, then its possible an error will happen. You may need to wire up the error out terminal of that function and handle it.