Using modbus/TCP with USB ethernet adapters

[MarkMoss]

I have a test stand where I have a handful of USB instruments and a single modbus/TCP slave.  I'm considering adding a USB ethernet adapter to the stand so that there is a single USB cable connecting the computer to the hardware rather than both a USB and an ethernet connection.  Does anybody out there have experience (good or bad) using USB ethernet adapters with modbus/TCP slaves?

The existing USB instruments all use ASCII/SCPI-style command sets.  The Modbus/TCP slave is an Automation Direct EBC-100.  Nothing high-bandwidth or low-latency.  Basically, the computer issues no more than a handful or command or request (ether SCPI or Modbus/TCP) per minute.

Mark Moss

Electrical Validation Engineer

GHSP

[Adam G]

Hello Mark,

I was wondering what NI hardware you are going to be using in your application? Also are you going to be using LabVIEW for the programming? Have a great day!

Best Regards,

Adam G 

[MarkMoss]

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@Adam G wrote:

Hello Mark,

I was wondering what NI hardware you are going to be using in your application? Also are you going to be using LabVIEW for the programming? Have a great day!

Best Regards,

Adam G 

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The test software is written in LabVIEW, and the test stand uses M-Series cards for data acquisition.

Mark Moss

[Joe D.]

Hi Mark,

I don't have experience with what you are trying to do, I would recommend against it as there seems to be a big quality and performance difference with the USB and on board setups.