VB.net Serial Port write commands - No response from the machine

I have a pull test machine, connected with COM7 to my PC. I want to Xrite some commands and get the required answer from the machine.
The machine came with a manual for data communication. that says that after sending the command the key displayed on the screen are locked automatically. to release the key functions the command "free!" must be sent via the serial to the control unit.
sample command :
- free!
to release the locked keys

val?
reslut +-XXXXX_N
the command CR completes the transmission of mesured values.

Actualy i am only able to read data from the machine by pressing the print button on the machine screen. I want to be able to send commands to get the required result.

serialport.write("val?")
No result

Any help will be much appreciated.

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JiachenLiMFST-9349 · May 12 at 05:52 AM

Hi @HichamJAAFAR-9909 ,
Could you please provide more code in the project?
It is difficult to identify the problem from the information you provided.

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DewayneBasnett-7583 · May 12 at 01:17 PM

"The machine came with a manual for data communication..." Can you give us specifics about the machine? A link to the manual you referenced would be helpful too.

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JiachenLiMFST-9349 · May 18 at 07:23 AM

Hi @HichamJAAFAR-9909 ,
May I know if you have got any chance to check my reply? It will be great if you can share more detailed information for us to better investigate this issue. Thanks for your cooperation.

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ABIGAILBERKOWITZ-0247 · Jul 19 at 08:40 PM

I am dealing with something similar. I am trying to control the movement of a gauge from the PC. I connected it to the serial port and have the machine commands, but I do not know how to put the commands in my code.
Did you figure out the answer you needed?
Thanks

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