Lakeshore 372 USB control issue with Mac OS X / LabView

francoisp
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Posts: 2

Lakeshore 372 USB control issue with Mac OS X / LabView Nov 21, 2018 9:21:07 GMT -5

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Post by francoisp on Nov 21, 2018 9:21:07 GMT -5

Hi,

I am trying to control a Lakeshore 372 resistance bridge from an USB interface. My configuration is the following :

Apple MacBook Air (13 pouces, mi-2012)
Mac OS X 10.13.6
LabView 2016
NI-VISA 18.0.0

I downloaded the LabView VIs from the NI website at sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=219B57E262CD504BE05400144FFA2D85

Write actions do not produce any error, but *no apparent effect on the parameters* is observed if checked from the front panel.

Read actions produce a *time out error* consistently.

I join a screen capture for illustration, with the "initialize.vi"

Thanks for your help !

Lake Shore Jeff M
Lake Shore

Posts: 293

Lakeshore 372 USB control issue with Mac OS X / LabView Nov 26, 2018 15:29:57 GMT -5

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Post by Lake Shore Jeff M on Nov 26, 2018 15:29:57 GMT -5

Hello francoisp,

It seems that we may have a bug in our model 372 driver. Your trace capture shows no response to *IDN?

If you look at the ‘initialize.vi’ in the 372 driver, it appears it’s sending *RST before it updates the COM port settings (parity, baud, stop/start bits). This causes an error state and the COM port to be messed up. We were able to see a similar problem when I ran the driver at my desk.

We have an updated VI that I would like to send you so please send me an email at service@lakeshore.com so I can forward the updated VI to you for verification that it resolves the issue.

francoisp
New Member

Posts: 2

Lakeshore 372 USB control issue with Mac OS X / LabView Nov 29, 2018 11:39:56 GMT -5

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Post by francoisp on Nov 29, 2018 11:39:56 GMT -5

Hello Jeff,

Thanks for putting me on track!

I got it:

-Installed the latest version of "CP210x Macintosh OS X VCP Driver v5" downloaded from:
www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers

- Read installation note for Mac Os X High Sierra:
www.silabs.com/community/interface/knowledge-base.entry.html/2018/03/30/usb_to_uart_bridgev-Dnef

- Rebooted Mac and LakeShore 372.

- Now "ASRL1::INSTR" appears in NI Max. Cut/paste in VI and it works (no error and LakeShore 372 "clicks")

Thanks!

Lake Shore Jeff M
Lake Shore

Posts: 293

Lakeshore 372 USB control issue with Mac OS X / LabView Nov 29, 2018 12:01:47 GMT -5

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Post by Lake Shore Jeff M on Nov 29, 2018 12:01:47 GMT -5

Thanks For the post Francois.

So that everyone knows the full story, we also provided an updated initialize.vi for your 2016 Labview application which resolved what we saw happening in the initial issue you reported. We will provide the new .vi to National Instruments and they will post an updated version of the Model 372 Driver within the next two weeks