Easily Access Registers and Coils in Modbus
Modbus may be older technology but thousands, if not ten of thousands, of Modbus devices still measuring, metering and analysing; probably some in your factory. Now, with the 460MMWI, you have an easy way to pull Modbus RTU Slave Registers and Coil data into your web applications. Use that data to easily build a HTML5 dashboard, archive data or create a sophisticated alarm system. The 460MMWI gets you the data – you just have to make use of it.
How do I get Modbus Slave data?
There are only two steps to accessing your Modbus Slave data. First, you configure the 460MMWI using the easy to use, browser-based configuration pages. You’ll identify the address of the Modbus Slaves to access, and the registers and coils you want to read. Once that’s complete, you’ll just issue standard HTTP GET instructions to move that data into your application. It’s that easy.
How is the Modbus Data Represented?
In your GET you can request either a JSON or XML data string containing tags for the Registers or Coils you identified. In XML, you’ll get something like <Speed105>523<Speed105>. In JSON, you’ll get “Speed105:523” for the same register. The leading 4 in the tag name identifies the notation as a holding register.
What Web Client Applications can I use?
You can access the JSON or XML tags from any web application tool including Python, PSP and other similar tools.
Why Use Real Time Automation as a Gateway Supplier?
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