Serial COM Port

[Jai@conti]

When Data is written to a COM port, why Same data is received back from the COM port?

[RavensFan]

What do you have attached to that serial port?  Could you have a loopback adapter connected?  A device that echoes the incoming command?

[GerdW]

Hi Jai,

because of the bended wires and hidden elements in your image?

Btw. please attach VIs or snippets instead of pure images - LabVIEW cannot edit JPG images!

When you have problems with serial communication you should tell us more about your hardware and settings!

- Why do you use BytesAtPort, when the TermChar is enabled?

- Why don't you use Ctrl-U (more often)?

[Jai@conti]

Hi RavensFan

I have attached K-LINE

[GerdW]

Hi Jai,

how did you connect with "K Line"??? 😄

When something unexpected occurs you should start to debug!

Have you tried to do this serial port communication using a terminal-type program (like HyperTerm)? What are the results using other software?

[Jai@conti]

Hi Gerdw,

Thank you very much.

i will debug it using Hyper Terminal.

K-Line is a protocol, i have a microcontroller at the other end 

I want to communicate with the microcontroller via K Line

FYR, find the K line reference doc attached

[GerdW]

Hi Jai,

I know where K-Line is used. I just wanted to recommend to provide information anybody can use when reading your messages!

Will you answer our other questions?

How did you connect? Which hardware is used?

[Jai@conti]

Hi Gerdw,

Sorry,I can not give you the hardware details.

There is already one tool to which device responds. but i want to develop exe for my own use.

I want to know how the input is formated and given to the device via K line

I am not able to write proper data that s why i am getting back the same data what i write.

Please let me know anymore info is required.

Thank you very much.

[GerdW · Accepted solution]

Hi Jai,

I want to know how the input is formated and given to the device via K line

Then you should read the manual of the device you are trying to talk with!

I am not able to write proper data that s why i am getting back the same data what i write.

Then why did you think it was a problem of the serial port?

Read the manual of the device you are trying to talk with and follow the protocol description given there!