Nothing in the buffer

[PitiUNB]

Hi all,

I'm struggling to make a VI to work with Omega controller. I have CN745 connecting with a computer via RS485 and using RS455-to-USB converter. I created a VI as in the attached picture. My problem is that I don't receive anything in the buffer. Any ideas what might go wrong in my VI? An interesting thing is that with the same physical setup (i.e. wiring, converter), I get to work using Visual Basic 6. I tried to look for example VI, but there is no direct example. So I adapted it from the ones that are close to my controller protocol (different Omega controllers may use different communication protocols)

Eventually, I will have this VI in a loop to monitor temperature for every few minutes. I also will add a write temperature setpoint VI in there.

[crossrulz]

I don't think you want to flush the buffer.  That could be clearning your data before you read it.

[Dennis_Knutson]

Using the string 'CRLF' will do nothing except send the ASCII characters 'C', 'R', etc. You need to send the actual control codes. You should have looked at the serial examples. The basic one has the string control set for '\' Codes display. With that, you use \r\n. You can also use the constants on the string palette.

[Dennis_Knutson]

p.s. If the instrument requires termination characters on a write, then it probably sends them on a read. You should enable the termination character and get rid of that silly Bytes at Serial Port. Get rid of the sequence structure at the same time.