Control 34401A Multimeter

[Dennis_Knutson]

Ate you sending a \r or a \n with the simple serial example? Compare it to the termination character being set with a property node on the block diagram of the initialize function. They probably don't match.

[Maloya]

\n yes i've used it on example programm and the VISA Interactive Control

You mean the initialise function of the instrument driver?

 No they don't use it. I worked on this difference at the beginning but put it aside, when an  instrument driver support engineer stated that this not necessary to change.

What do you think about it?

Is it necessary after every write?

[Dennis_Knutson]

The initialize function in the driver does set the termination character with a property node so that you don't have to append a \n. Look at the block diagram. I'm posting from my phone and can't right now but it's probably set to append a carriage return so either change the VI our make the instrument match.

[Maloya]

They use a line feed their, but shouldn't this be fine?

  The Line Feed (LF) character (0x0A, \n) moves the cursor down to the next line without returning to the beginning of the line.  This character is used as a new line character in UNIX based systems (Linux, Mac OSX, etc)

Nevertheless I changed it to carriage Return to give it a try. I changed just the string but there is still the same error.

[Dennis_Knutson]

The line feed looks okay. The initialize function is using 2 stop bits. Is your example set the same?

[Maloya]

Yes it is.

[Dennis_Knutson]

The next step would be to turn on I/O Trace and run both the id query in MAX and then the initialize function.