Wiesemann & Theis GmbH

Networking, sensors and interface technology for industry, office and IT

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Networking solar systems via Modbus

Using the Modbus interface of the DTUs

Which product is right for your application?

Modbus/TCP <> Modbus/TCP Image of Network Extender SPE

A Network Extender SPE for Modbus/TCP interfaces.

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Modbus/TCP <> Modbus/RTU Screw terminal

A serial device server, here a Com-Server++, as a TCP gateway.

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Modbus/RTU <> Modbus/RTU Com-Server++

A Com-Server Set connects two Modbus/RTU interfaces.

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    Connecting Modbus interfaces in photovoltaic systems

    Infographic house with solar system and your connection through the house

  • Would you like to expand your PV system with additional Modbus sensors or actuators? Perhaps these are not located in the same room, but elsewhere in the property? Maybe you would like to access your system or energy management data via Modbus? Then the following applications could be right for connecting the respective interfaces.

    • The highlight: Use existing network cables

  • What all the following applications have in common is that you can use your existing cabling. Depending on which interfaces the respective devices are equipped with, different converters or extenders are required.

    Network Extender SPE for Modbus/TCP interfaces

    Infographic Modbus/TCP interface to Modbus/TCP interface

  • If the components to be connected both have a network interface and therefore a Modbus/TCP interface, the connection can be realized via Network Extender Set using any desired cable. Whether Ethernet, Single Pair Ethernet, bell wire or any shielded, two-core or multi-core cable: the extender set bridges distances of up to 1000m and even more if you connect another set in series.

Blue devices on DIN rail

Network Extender SPE, article no.: 55608

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    Serial device server as TCP gateway

    Infographic Modbus/TCP interface to Modbus/RTU interface

  • If the systems to be connected are equipped with different Modbus interfaces, a serial device server such as the W&T Com-Server is suitable for the connection. This converts the Modbus/TCP requests from the management system into Modbus/RTU requests that an inverter, for example, can understand. The existing Ethernet cabling in the property can also be used to connect the Com-Server to the management system.

    Serial Device Server Set connects two Modbus/RTU interfaces

    Infographic Modbus/RTU interface to Modbus/RTU interface

  • If Modbus/RTU interfaces are available at both ends of the line, two Com-Servers can be switched to Box-2-Box mode. The two serial interfaces (RS485) are each connected to one of the two Com Servers, which in turn can be connected via the existing network cabling.

Blue devices on DIN rail

Com-Server++, article no.: 58665

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Try for 30 days at no cost!

Test now!
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Do you have more questions?

Calls are welcome

Any questions about networking ModbusTCP or ModbusRTU via Ethernet?

Personal support

Not sure which product is right for your application? Or do you have questions about commissioning, installation or use? Our team of technicians is there for you personally on weekdays from 8 am to 5 pm!

Phone: +49 202/2680-110 (Mon.-Fri. 8 a.m. to 5 p.m.)

E-mail: info@wut.de

Order a sample

Commercial customers can request samples of all products from W&T. If the sample is returned within 30 days, you only pay the return costs. If you would like to keep the test device, simply pay the enclosed invoice.

Com-Server SPE network extender

Additional information


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