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davtu
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Re: Converter
davtu   7/30/2013 12:54:21 PM
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The devices that you listed allows the controller to use RS-232 via the PCI or PCIE bus. This still does not solve the problem of how to to get RS-232 to converse with a USB device. My point is that the converter needs to have the right USB protocols in order to talk to the DMM on the device side. RS-232/USB converters work because they communicate easily to the USB controller since the drivers work with any PC. However, on the device side you need unique drivers for every type of USB device.

The suggestion in your blog post was to use a RS-232/USB converter to talk to the new 34461A which I don't believe is possible. However, a RS-232/USB converter would work quite well with the 34401A.


Perhaps we can take this offline, once we come to an agreement we can update the comments section.

MeasurementBlues
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Re: Converter
MeasurementBlues   7/30/2013 12:29:37 PM
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If the instrument and the controller both have USB, of course that's what you'd use. But, older instruments such as the 34401A were designed before USB and it was never added. Tha started with the 34405A/34410A/34411A series a few years ago.

See The Serial Port: It Just Keeps Going for several types of interfaces that add serial ports to computers and controllers.

davtu
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Re: Converter
davtu   7/30/2013 12:23:19 PM
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I'm not sure that I understand how a RS-232/USB converter could be used in that case. RS-232 can only talk to one device at a time. How would a system with multiple IO's use the converter? If they have USB, wouldn't they just use USB? Not trying to be snarky, I'd really like to understand how to get this to work.

MeasurementBlues
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Re: Converter
MeasurementBlues   7/30/2013 12:16:20 PM
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>An RS-232 to USB converter won't work with the DMM.

That's true if your controller has the RS-232 port and the Meter has USB only. But, many automated test systems use more than one communications bus, for that reason.

davtu
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Converter
davtu   7/30/2013 12:13:42 PM
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An RS-232 to USB converter won't work with the DMM. Normally those converters connect the USB side to the controller while the RS-232 connnects to the device. For those that need RS-232, it is usually the controller that has RS-232; while the device (DMM) is USB. This is difficult for converters since they need to have the proper USB drivers to talk to the DMM. There aren't many (if any) of those out there.


A better method is to use RS-232 to Ethernet converters. I did a write up on a blog for this: http://gpete-neil.blogspot.com/2013/07/rs232-to-control-lxi-instruments.html

 

 

MeasurementBlues
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Another versionb of this story.
MeasurementBlues   7/9/2013 4:39:33 PM
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See What! They're Replacing My Meter? at DesignCon Community.

MeasurementBlues
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Final 34401A purchase
MeasurementBlues   7/9/2013 4:37:05 PM
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I imagine some large defense companies with many test systems in house will buy many 34401A meters because they are convinced that there are alwasy differences that can mess up their test results.

MeasurementBlues
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Re: new version is better
MeasurementBlues   7/9/2013 4:36:36 PM
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>I rather like that new screen they are using

It looks like a nice display. Agilent has been using that type of display in several other products.

 

B_Albing
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new version is better
B_Albing   7/9/2013 2:03:47 PM
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Martin, I rather like that new screen they are using - makes an instrument that is sort of like a bare-bones 'scope. I think I'll go with the new version.



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