Instrument Control (GPIB, Serial, VISA, IVI)
How to attach graph to Visa Read in labview for real time graph
Again, since you are using a termination character, you do not need to use the Bytes At Port node. Just tell the VISA Read to read a very large number of bytes and it will stop the read when the termination character is reached.
Haris115 wrote:Program is attached please check it
There is no need to keep attaching the same identical program with every response. That's just redundant. Once is enough!
Unless you tell us exactly how the reveived string looks like, we cannot tell if the conversion is correct. As has been said many times: without the use of a termination character, you will most likely get corrupted the data because of frame shifts and such.
If you have such a hard time with all this, maybe programming is not what you should be doing in the first place. This is not a LabVIEW problem, but just common sense. The same logic would apply in any other programming environment.
@Haris115 wrote:
Please tell which components are redundant and extra. .
You attached the identical VI here and here (yes, I did a diff and the outcome was blank). As I said, once is enough. (I don't know if the forum has a good deduplication algorithm).
Haris115 wrote:In our requirement, data come at radomly and how can we judge that each and every data for termination letter. How can we find termination letter for huge amount of random data coming at pc.
If you have a huge amount of random data, not having a termination character just makes things much more difficult or even impossible. (For example if the data is received as 123.4567.899.123.44.67, is the correct data 12, 3.45, 67.899 ... or 1, 23.4, 567.9, etc.). Use of a termination character is absolutely essential!
Haris115 wrote:I don't think termination letter will effect the coming data.
It will affect the correct interpretation of the incoming data, see above. It will also facility correct reading of each valid point, without needing to get the byte count at the port.
@Haris115 wrote:
Also tell me how to convert the graph to dbm graph.
Please spell out acronyms. we are not clairvoyant. You also don't have a graph, you have a chart (big difference!).
@Haris115 wrote:
Please tell which components are redundant and extra.
Posting the exact same VI with each response
Haris115 wrote:
In our requirement, data come at radomly and how can we judge that each and every data for termination letter. How can we find termination letter for huge amount of random data coming at pc.
I don't think termination letter will effect the coming data.
VISA is find the termination character and give you all of the data before it. It is a way to frame you data to make sure you have ALL of the data. I does affect your data. Otherwise you have race conditions. What happens if you check the serial port in the middle of a transmission? The port may say it has 3 bytes, but the full message has 5. You will now be 2 bytes off for every transimission from then on out. You will notice it if you have 2 items that says 100 and 0 when it should be just one item of 1000. The termination character will eliminate this if done correctly.
