How Serial communication works?

[Bhadresh]

Hello

I am doing some personal project in that I use LabVIEW. I need serial communication with PC LabVIEW and one relay card.

So, I want to know about the working of LabVIEW serial communication.

I just use USB to RS 485 converter (home made) then through RS 485 to relay card.

In this relay card relay operate as per signal coming from RS 485.

Can you explain me how it work?

I have already work with LabVIEW but not done serial communication.

Thank you...

[crossrulz]

Look in the example finder (Help->Find Examples...) for Basic Serial Write and Read.  That should get you started.  See what you can do with it. If you have more questions, show us what you've tried and tell us where you are stuck.

[Bhadresh]

I have already shown the example, but didn't get any idea from that .

I want to know about working principle of the serial communication, how it transmit and receive data?

Thank you

[nathand]

https://www.google.com/search?q=serial+communication

[Bhadresh]

Sorry about that but I know about serial communication but I know about with labview.

How it interact with labview ?

[smercurio_fc]

We don't understand what you are asking. What is your LabVIEW question? If you're asking how to do serial communication with LabVIEW, you've already been told about the example. As you can see from the example, you use VISA, which is an API. Do you know what an API is?

If you have a more fundamental question, I would suggest you start here: http://www.ni.com/white-paper/4359/en