34420A Meter LabVIEW Connection over USB Timed out Error

[paulrathke]

Hello I have a Keysight 34420A Meter and I want to connect it to my laptop over USB, that I can controll it by LabVIEW.

I have installed 34420A driver and RS232 to USB driver. I tested the example code, but there is always a timed out problem, visa error code is -1073807339.

I read the similar solution from community, but these solution can't fix it. How to solve it?

labview: 2018, visa: 18.0

Here is my configuration.

[RTSLVU]

1. Are you using the right com port? (VISA Resource)
2. Are you using the right serial protocol? (Baud, Stop bit, Parity)?

Most often it's one of those first two things. 

If not, using the VISA Test Panel  (part of Ni-MAX) see if the instrument responds to an *IDN? query. 

Last resort if all else fails: Try increasing the timeout period