The NETx BMS Platform Core Server provides a Modbus interface which can be used to integrate Modbus devices. NETx BMS Core Server supports the handling of Modbus All Modbus datatypes are supported: discrete inputs, coils, holding registers, and input registers.

Since there is no discovery protocol for Modbus the configuration has to be done manually.

Modbus device definition

To define a Modbus device, first select "Device definitions " in Modbus  menu within the NETx BMS Core Serverselect open the Core Studio and select the menu item in Modbus / Device definitions.

 Here you set up driver settings so that the NETx BMS Core Server is found as a Modbus device:

Image RemovedHere the device parameters are defined. Provide a name, an IP address and a port and select the device type in the last column.

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More information about Modbus device definitions fields can be found here.

Then, select "Modbus datapoint definitions " in Modbus menu, here the datapoint definitions can be added for each one of defined Modbus devices. 

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Modbus data point definition

In the Core Studio, select the menu item in Modbus / Datapoint definitions.

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For each data point provide device name, data point type, address. Details on Modbus datapoint definition can be found here.

Modbus address mapping

To use an addressing scheme different to the standard Modbus memory addresses that start with address 0, an address mapping is possible. Select "Select the Modbus / Modbus mapping definitions " in Modbus menu . For menu item and provide for each Modbus device , an individual address mapping can be specifiedand register type an offset that is added to the address configured in the data point definitions.

The structure of the Modbus address mapping definition can be found here.

Afterwards, save all changes in Modbus tabs, NETx BMS Core Server will display a reinitialization message.Restart the NETx BMS Core Server again and open an Item Tree. All Modbus devices and objects are found under the sub tree "NETx\XIO\Modbus". Each device has one entry within the Item Tree. Below this entry, you will find a GATEWAY item which shows the connection state to the Modbus device. In addition, all selected objects are listed. As defined by the Modbus standard each folder represents the Modbus Datapoint type.

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