VISA test panel works but VISA Write does not.

[Sai_09]

Hello. I am using LabVIEW 2023 and I want to automate which includes an optical copper and a monochromator. I used the commands provided in the manual which works with the VISA Test panel but does work with VISA Write. I enabled the termination character to 13, for carriage return (\r), in VISA Configure Serial Port and even enabled " '\' Codes Display " for the string of  VISA Write but still it doesn't work.

I am using a USB connection (USB A to USB B)

I have attached one of my basic code where I want to run the chopper, for which the command is " enable=1 + carriage return ". I have also attached the manual of the chopper just in case.

Can anyone please help me out with this?

[Bob_Schor]

According to the manual to attached (thanks) and the very tiny code snippet, it should have worked, but how would you know?  You only send an "enable=1\r" command to "some unspecified port", and then quit!  I didn't read enough of the manual to know what to expect, but I assume that the device would respond with an acknowledgement that you could observe with a VISA Read.

I should have bookmarked it, but there is an excellent video out there by Tim Robinson on how to (properly) use VISA.  [Found it -- search for "Reading VISA in LabVIEW Tim Robinson", and it will take you to the video in the LabVIEW Wiki].

Bob Schor

[RTSLVU]

I suggest you watch this video: VIWeek 2020/Proper way to communicate over serial 

[Sai_09]

Thanks for your response Bob_Schor and RTSLVU but I watched the video and didn't get any proper solution.

I actually kept a PORT control for Visa Resource name like this here.

I had also wired a VISA Read after VISA Write as you said earlier. When I read the buffer from VISA Read I get the same string which I send from the command, just the difference is that it doesn' t include the carriage return (\r). 

Like for example, in the below VI I ask for the current frequency but I get the same string.

Where actually I should get a value like this. (This is from the VISA Test Panel)