instrument control NI visa RS232

[Lilou_lilou]

Hello everyon, I am beginner on Labview and i wish to get your help please! 

Indeed i want to develop an application ton control a laser (connected in serial port, protocol RS232), i want to parameterize it (write the control mode, write the preamplifier diode current set point, write the bosster diode current set point ...) I have this instruction from the constructer: 

Baud rate =19200 bps

Nimber of bits= 8bits 

Stop bit= 1

Parity= None 

Handshaking = None 

Delimiter /r 

I used Ni VISA, i can connect and disconnect my instrument (i see the com and i don't have any error message) but i can't turn on my laser nor emit a laser beam.

Can someone assist me please ? Would you have some examples for me ? 

Thanks in advance.

Merci

[GerdW]

Hi Liluo,

---

@Lilou_lilou wrote:

Can someone assist me please ? Would you have some examples for me ? 

---

How should we assist on communicating with an unknown (to us) device?

Solution: read the (programming) manual for that device and use the commands given in there!

Generic answer: when you want to communicate with external devices you need to know their communication protocol. Most often this is described in the manuals…

[RTSLVU]

On top of what GerdW said, I suggest you should watch this video and learn the proper way from the start:

VIWeek 2020/Proper way to communicate over serial

[Lilou_lilou]

Hello GerdW
I appreciate your answer, thank you, indeed on the manual of my instrument I have no specific information except for commands not adapted to labview I think.
I give you some examples: IC2? Read the booster diode current set point.
TD1? Read the actual preamplifier diode temperature ...
But I will try to find out more. Thank you for your help.
Have a nice day.
Best regards.
Lilou 

[Lilou_lilou]

Hello,
Thank you very much, this will certainly help me! Have a nice day.
Sincerely