VISA + Serial Communication - need help!
Hello world
I have a lot of help with my project of this forum and I'm looking for more . Thank you for taking the time to help. Please bear with my as I ask a LOT of questions.
I intend to control a frequency converter using its series terminals and send orders from my PC + LabVIEW it. The commands do the basic functions like, start, stop, speed up/down etc etc. I use a converter Series USB to transfer data.
Now, I ve played with examples like SERIAL COMMUNICATION VI and others and I begin to understand the functioning of VISA.
Q1. In order for LabVIEW + VISA contact my frequency converter, do I need to install some sort of a driver for him to recognize? The frequency controller is old ages, even I don't know and I don't think I can find a driver for it any time soon? What kind of driver I'm looking for? Is it possible to customize my own driver and which would be easy?
accessory included - process.jpg
I downloaded some pictures about the problems of data format. I need to send information to the converter to format "telegram" as shown in the image below. Each 'function' in the 'format telegram' has varied length in bytes: some have 1 others have 2, other 4...
I also downloaded an image called "Format.jpg" which indicates what information each of these 'functions' will contain. Note:-the frequency converter uses only the last 4 bits.
Say for example:
START function will have this bit of information-
Start the Byte - ASCII ' 59 "
Address - 00
Control character -? I'm not sure what it should be I need to use the converter based on parameter values - is confused on what to choose - C, U, I or r Start, stop, etc. have their own specific parameter values such as 402, 404 RESP, so I guess I want update (U)?
Word of State control -? depends on the previous action
Sign - do not necessary
Data - 0
Comma - is not necessary
check the sum - is not necessary
Stop the Byte - ' > ' (ASCII: 62)
Phew... How would I go about clubbing this whole format together to send a control signal? Put all this information in a table allow somehow?
Please help to me... to achieve desperately need...
Thank you
Sandeep
It would be useful that you could find a driver, but it is not absolutely necessary to have a. You can write your own, use the Instrument i/o Assistant, or use VISA readings and some discreet.
The format of the commands is a bit complicated but not impossible. You just need to be careful to have the exact number of bytes.
What I don't see in the atttachments, it is possible words to control and the State and the number of parameter. I hope these are in another part of the manual.
A bytes example (without the control and settings) to update the frequency to 12.34 could be '<00U________+123403??>'.
00U________+123403??>
Tags: NI Hardware
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