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This is the first time in my life I need to try "Modbus RTU", and as a master I need a RS485 to USB converter which will establish connection to the PC.

I have found some converters in the market which stress and mention their product is Modbus compatible such as this one.

On the other hand there are many other RS485 to USB converters which does not mention Modbus at all.

Below is my basic plan:

enter image description here

I found a converter for this purpose, but its data-sheet does not include a word about Modbus. Isn't Modbus a protocol and the converter itself a physical layer? What is being meant here by saying "Modbus compatible"? Most importantly, how can I know whether this converter supports Modbus RTU or not?

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  • \$\begingroup\$ FYI: Links eventually go dead or the content changes. Be sure to put something in your text that gives an idea of what you're linking to. In this case, replace "this" with a model number. \$\endgroup\$ – Bort Apr 18 '18 at 18:41
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Modbus is a protocol that typically uses RS485 physical interface. Any adapter that is RS485 compliant should work with Modbus.

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  • \$\begingroup\$ So writing extra "Modbus compatible" to an RS485 to USB converter seems to be a marketing trick then? \$\endgroup\$ – user1999 Apr 18 '18 at 19:02
  • \$\begingroup\$ They probably know that is the largest market for their product. \$\endgroup\$ – EE_socal Apr 18 '18 at 19:08

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