Route 1: Professional II TCP/IP via Modbus TCP
The TCP/IP version has a built-in Modbus TCP server. The Miniserver queries the meter directly on the network; no gateway is needed.
- Find the IP address of the meter. By default it obtains it via DHCP; it is shown on the meter under «Settings» → «IP address». For operation with Loxone we recommend a fixed address.
- In the meter’s web interface, check that «Modbus active» is switched on and note the port.
- Import the EMU template for Modbus TCP from the Loxone Library into Loxone Config and enter IP address and port. The slave address of the Professional II TCP/IP is always 1.
The meter updates power, current, voltage, frequency and power factor about every 500 to 900 ms and answers up to four queries at the same time. The TCP timeout is set to 10 seconds by default and can be set between 10 and 600 seconds.
Route 2: Professional II RS485 via Modbus RTU
Where there is no network in the distribution board, the Professional II RS485 runs on the RS-485 bus of a Loxone Modbus Extension. Several meters are daisy-chained on the same line, each with its own Modbus address.
- Wire the meters in a line, not in a star, and terminate the line at both ends.
- Set the Modbus address and baud rate on the meter, the same baud rate as on the extension.
- Import the EMU template for RS485 from the Loxone Library into Loxone Config and enter the address for each meter.
Topology, termination and addressing are explained on the RS-485 / Modbus RTU page.
Route 3: M-Bus meters via the M-Center
Heat, cooling and water meters mostly speak M-Bus. The M-Center reads them and provides the values with the Modbus TCP server licence (210.300.04). In Loxone you create the M-Center as a Modbus TCP device and read holding registers:
| Value | OBIS code | Register float32 |
|---|---|---|
| Cold water, volume | 8-0:1.0.0 | 3000 |
| Hot water, volume | 9-0:1.0.0 | 3030 |
| Heat meter, meter reading | 4-0:1.0.0 | 4060 |
| Heat meter, flow temperature | 4-0:3.1.0 | 4120 |
| Electricity, import tariff 1 | 1-0:1.8.1 | 1030 |
Prerequisite: the OBIS code is entered for the registers in the M-Center. The device address is the «Modbus TCP Server device number» of the respective meter. Data type float32, big endian, high word first. The manual counts registers from 1; check with a known meter reading whether Loxone expects the address offset by one.
Order numbers
| Item | Article number | Shop |
|---|---|---|
| EMU Professional II 3/100 TCP/IP – direct connection 100 A | P20A000T | Shop: EMU Professional II 3/100 TCP/IP P20A000T → |
| EMU Professional II 3/5 TCP/IP – CT connection | P21A000T | Shop: EMU Professional II 3/5 TCP/IP P21A000T → |
| EMU Professional II 3/100 RS485 – direct connection 100 A | P20A000MO | Shop: EMU Professional II 3/100 RS485 P20A000MO → |
| EMU Professional II 3/5 RS485 – CT connection | P21A000MO | Shop: EMU Professional II 3/5 RS485 P21A000MO → |
| M-Center for 20 M-Bus devices | 210.000.00 | Shop: EMU M-Center 210.000.00 → |
| Modbus TCP licence (M-Bus to Modbus TCP) | 210.300.04 |
Order online in the EMU Metering shop.