Impossible to acquire the lock on Fluke 45 COM1 series in LabVIEW

When the ECHO of multimeter Fluke setting is enabled, the following occurs using the Panel to test VISA OR max:

  1. In the VISA sign, a write command is sent to write * IDN? \r to the multimeter.  No error, the DMM accepts the order.
  2. In the VISA sign, a reading command is sent and the DMM previous writing echoes (* IDN? \r) command to the VISA sign
  3. In the VISA sign, a reading command is sent, then the DMM shows the output of the command "write" (FLUKE, 45, [redacted] sn, D1.0\r\n 1.7)
  4. In the Panel VISA, a read command is sent, and then the DMM indicates that the "write" command has been received and executed successfully using default BOM of the DMM (-online \r\n)

Note that this is quite the same when ECHO is turned off, except that step 2 does not occur.

Now, it's quite identical to the output during the next show the * IDN? order Tera Term:

* IDN?

Fluke, 45, [redacted] sn, 1.7 D1.0

=>

(Tera term, does not display the CR (\r) or line feed (\n) as does the VISA Committee).

Thus, it would seem that the VISA panel communicates with the DMM in the same way as terminal, it is simply not actively reading such as Tera term and requires the user to request a read line.

What I don't understand is the difference between the behavior of the DMM when you use the Tera term or the Panel test VISA and when using LabVIEW.

When communicating with the DMM in terms of Tera or the VISA sign, the digital multimeter answers ranging from 1 view state to indicate status 2 (see images below).  When you try to use even the simplest example communication series live or the driver plug-and-play Fluke screws, the DMM remains to view state 1.  Note that the change of State 1 to State 2 happens only after the launch of a connection in Tera term or the VISA sign; so, I think I'm having a problem where LabVIEW is unable to acquire a lock for communication with the instrument series.

If someone has some, please let me know if you have a way to solve this particular problem.

Display status 1:

Display state 2:


Tags: NI Hardware

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