Hello, I want to design control software for my power supply which has serial interface, but the communication protocol is non-standard so i cannot find any driver for it, I only have serial communication command set, I'm very new at LabView and I dont know where to start, commands are looking simple, just set voltage/current and read output - disable/enable output and read CC-CV state, should I create driver first refer to command set? Or how can I define these non-standard command set? Please can you help me?

Hi BerkayBtr, @BerkayBtr wrote: Thanks for your answer, I've already estabilished test connection with NI-MAX and send commans and got right responses, I have watched tenth of videos about simple serial communication but what I don't know is how to design a voltage/current knob to adjust voltage from front panel instead of sending single command with simple example, as I told I'm totally new to LabView I have started to learn 1 week ago For this, you probably want to use "Format into String" or similar. An example might be like this (here I do the full command in one part, but I also would suggest something like what Crossrulz mentioned with separate VIs to set the address and \n parts). Here the "Display Style" of both the front panel indicator ("Command to Set Voltage") and the Format String on the block diagram are set to "\" or '\' Codes Display (via right click menu): This can be helpful to see the characters like the '\n'. The other part that you might or might not know about is the "Connector Pane" (top right on the front panel): Clicking in here allows you to set the externally accessible controls and indicators for your VI (so you can use it in other VIs more effectively). This is similar to setting parameters or return values in text-based programming languages (if you're more familiar with that concept). See Building the Connector Pane for more information.

I would start by making a VI for each of these commands. I would also go so far as to make this into a class so that the class can hold the VISA Session and the "machine address". You could even make a VI for that prepends the machine address and Line Feed (\n) and write to the supply. I would also make a VI that sends a command and then reads the reply. You can use these two lower level VIs in each of your other VIs for each command.

LabVIEW

Programmable power supply

Solved!

Author

Hi cbutcher,

I have created a VI for testing my power supply as you suggested, it works, huge thanks to everybody for suggestions, now just for one thing I need help, I want to read output voltage continuously and at the same time want to adjust output voltage. As I understand I have to put READ function inside of while loop with shift register for continuous read, but can write and read function work simultaneously? Here is the VI I have created just for voltage write command

Message 11 of 11

(857 Views)

LabVIEW

Programmable power supply

Re: Programmable power supply