Wireless RS485 Transmitter: The Energy Meter & Inverter Connection Solution

Levtech Wireless RS485 Transmitter | Energy Meter & Inverter Connection

Eliminate Modbus communication cables between your inverter and your energy meter. A robust, ready-to-use wireless solution for all photovoltaic configurations.

Levtech's LSP-STR-485 transmitter is the technical answer to cabling issues at photovoltaic sites. This device creates a "virtual bridge" between your Smart Meter and your inverter, ensuring real-time data transmission for perfect management of self-consumption and zero injection.

Key features:

• High immunity to interference: Unlike Wi-Fi, Levtech's 868 MHz radio technology passes through thick walls and does not interfere with your domestic appliances.
• Simplified installation: Direct 230V AC power supply. No external transformer is required, facilitating integration into a DIN rail electrical panel.
• Connectivity: The manufacturer includes a standard antenna connector that allows the antenna to be moved outside metal cabinets for maximum reception.

Three versions for every need

Adapt your installation according to distance and environment:

• 100-metre version – Residential use: Ideal for a standard house where the meter and inverter are separated by a few walls or a small garden.
• 400-metre version – Extended residential & tertiary use: Designed for large properties, farms or buildings with thick walls. Offers increased penetration power.
• 800-metre version – Industrial use: The high-performance solution for factories, logistics warehouses or ground-mounted solar parks. Maximises signal stability in congested environments.

How the Levtech wireless RS485 transmitter works

The LSP-STR-485 is a radio wave signal transmitter designed to establish wireless communication between two devices using the RS485/Modbus protocol.

Simple and scalable installation

• Point-to-Point Mode: For a standard connection, two units are required: one configured as a transmitter and the other as a receiver.
• Multi-device network: If your system includes several devices, a single module at the processing unit (PC or UPS) is sufficient to control up to 254 slave devices simultaneously.
• Transparent Communication: Once installed, the modules enable wireless communication via radio waves as if your devices were connected by a physical cable.

Wiring: Simplified installation

The transducer connection has been designed for quick integration into your electrical cabinets.

• Power supply: The transducer uses 230V AC, allowing for easy installation in any electrical cabinet.
• Mains connection: Power is supplied via the connector located at the bottom of the box.
• Data connection: The RS485 signal wires (GND, A, B) are connected at the top.
• Technical tip: If communication fails, the A and B wires can be interchanged.
• Signal quality: It is recommended to use twisted pair wires for the communication lines between the transducer and the remote device.

Expert programming of the RS485 transducer

The LSP-STR-485 is configured via a simple and precise interface, allowing you to adjust the device to your specific needs.

Equipment required for configuration:

• Hardware: A laptop and a USB-RS485 converter.
• Software: The free PuTTY software must be installed on your computer.

Configuration steps:

1. Connection: Connect the device as shown in the wiring diagram.
2. Accessing the menu: Follow the instructions to access the programming menu via PuTTY.
3. Available settings: The configuration menu allows you to change the following essential settings:
   • Communication channel (Channel).
   • Identifiers (Remote ID, Local ID, Network ID).
   • Security key (Key).
   • Transmission settings (Baud rate, Parity, Stop bit).

Once the settings have been adjusted, simply select the restart option to apply the new configurations.

Why choose the Levtech wireless transmitter?

1. Ultra-fast plug-and-play installation

The modules arrive pre-paired from the factory. Simply connect them to a 230V power supply and connect terminals A and B. No complex software configuration is required.

2. Ultra-penetrating 868 MHz radio technology

Unlike Wi-Fi (2.4 GHz), which quickly becomes saturated and has a short range, the 868 MHz frequency penetrates obstacles (concrete, metal, slabs) more easily and guarantees smooth communication without interference with your internet network.

3.Universal Modbus RTU compatibility

This system is transparent: it transmits data without modifying it. It is compatible with:

• Inverters: Deye, WKS, Victron, Fronius, SMA, etc.
• Energy meters: DTSU666, Victron ET112/ET340.

Our expert advice:

Running a shielded cable between a charging station or inverter and the main electrical panel can account for 40% of an installer's working time. With the Levtech transmitter, you can reduce this time to 10 minutes while ensuring the same measurement accuracy as with a wired connection.