LabVIEW is randomly down 4 or 5 bytes from front of sequential readings
I posted this topic in the forum, VISA, but there seems to be no traffic, and this seems to be a problem of software anyway. I have a serial device that is supposed to echo all commands and then send it to arrive at an answer firther. My problem is that LabView is declining the first 4 or 5 bytes for the echo, and there is no clear reason for whether it is 4 or 5 bytes. Using a terminal I get the response you want:
$ echo - en "\xFA\x30\x4\x43" >/dev/ttyr02
$ od - x<>
0000000 30fa 4304 30fa 4304 30fa 050 has 2e06 010 a
0000020 9478
It did the right thing at the level of the operating system, but Labview still refuses to read the first 4 / 5 bytes. Someone saw something similar in the past? I'm pulling out my hair. The thing is, I can use LabView to write random bytes to a serial port, reading from each other by a null-modem cable, and everything I write comes back fine. Therefore, there is no consistency. Is 0xFA one kind of specificity of who I should be aware?
Have you tried thw VISA writes and reads the synchronous value? as a use of emulators or Terminal? Click with the right button on the functions, and then select Setup (the clock in the icon should disappear.
And the FA would be 4 of those to get attention followed by 1010 for recovery of clock on the end
Tags: NI Software
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I'm relatively new to LabView, I like to think that I learned a lot through trial and error and read this forum, but I am confused by something here. I hope someone out there has an idea.
I have a program that controls a pump. I am communicating via a USB-serial cable. In general, how my program works is that it sends a command to the pump, and then he immediately starts querying the pump for its status. I have the query in a loop that repeats every second. While the pump is moving it returns the busy status, and when it finishes it returns to the ready state. When the program receives the ready status, it exits the application and send the following command.
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Opening and closing of the VISA session several times are generally not a good idea. It is preferable to configure the port outside the loop, do th ereads and written inside the loop, and then close the session after the end of the loop. I would not be surprised if your serial port gets frozen due to the frequent opens and closes.
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