Data related to communications received conspire RS-232

Hi all

I am trying to receive data using the RS-232 serial communication and plot the data in real time. I have a 24-bit data at the transmitting end, so I use "Join numbers" block in the labview to join the three 8-bit data (the final result is the 32-bit data after joining the numbers with 8-bit zero value data). After data entry, it is sent to the waveform table. The received data should be Wescott on 8 different waveform cards, while the first 24 bits data are Wescott on the first chart of the wave, the second 24-bit data are Wescott on the second table of wavform... This is the reason why the 'String subset' block is used.

The next two links show the block diagram:

http://Prnt.SC/c0drv9

http://Prnt.SC/c0dsl9

As you can see I am highlighting the process execution. If in the first link I showed some data arrives to the waveform charts. But in the second link, you can see that each table waveform except two are conspiring the value zero. My question is why what is happening?

I am aware that there is an error in the communication, but it should not interfere with the layout of data.

Thanks for any help.

Darko

Why you use "bytes to the Port?  It is almost always the wrong thing to use.  You wrote a command and don't give any time to the device address (although the highest point the execution could have slowed things enough to cope).  If you get probably a short message of only a few bytes.

If each message is the same length, then son of this many bytes in reading and get rid of this byte to the Port node.

In addition, you have the stop enabled by default with the series character set VI, which is a default line break character.  It is a huge problem because you try to read binary data.  It's a decent chance, you're going to be sending a number which byte is 10 decimal.  If that happens, VISA playback will stop there and give you incomplete data.  You must disable the stop character in the run configuration function.

In addition, use block diagram cleanup because you have too much overlap and the wires to the rear.

Also, don't son a constant in all indices of this function of the Index table.  By default, it will give you index, 0, 1, 2, 3,... with nothing plugged in.

Tags: NI Software

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