The M-bus IoT gateway can be used in various ways:
M-Bus IoT gateway with wired M-bus devices
The M-bus IoT gateway reads up to 20 directly connected devices (20 simple M-bus loads). M-bus devices are connected over line M1M2.
M-Bus IoT gateway with level converters
Up to six level converters (WTV531, WTX631) can be connected in parallel per line to a M-bus IoT gateway.
The level converter (A) is connected to a M-bus IoT gateway via the RS-232 interface (terminals A, B, C). The following level converters (B) can be connected via the M-bus SLAVE connection.
Up to 60 M-bus devices can be connected to each WTV531 level converter.
A | Level converter WTV531 (master) |
B | Level converter WTV531 (slave) |
Up to 250 M-bus devices can be connected to each WTX631 level converter.
UP to six level converters WTX631 (one level converter, five repeaters) or up to two level converters WTV531 (one level converter, one repeater) can be connected in series to a M-bus IoT gateway.
M-Bus IoT gateway with wireless devices
The M-bus IoT gateway is equipped with additional RF converters to extend the system up to 2,500 wireless devices. The communication between the M-bus IoT gateway and RF converters takes place over a mesh RF protocol (backbone network).
A minimum of one M-bus IoT gateway and one RF converter is required to read out wireless devices. The backbone RF network can consist of a maximum of 23 RF converters. Communication between the RF converters and wireless devices takes place over the wireless M-bus protocol. The RF converter saves the consumption data from the devices in its environment, while forwarding the data to other RF converters, up to the M-bus IoT gateway (the other RF converters act as repeaters here).
M-Bus IoT gateway with network nodes
WT.. network nodes receive telegrams from consumption meters.
Up to 12 network nodes can communicate with each other on a network and exchange the respective consumption data (mesh system). This way, up to 500 heat cost allocators and/or wireless heat/water meters can be incorporated in a radio network (manages 500 addresses). This means that each individual network node stores all consumption data for the entire network.
One M-bus IoT Gateway can read up to 5 networks in parallel. At least one of the WT.. network nodes must be connected to M-bus IoT gateway using a physical M-bus line.
The M-Bus primary address for the connected WT.. Network node is 253.
Up to 20 simple M-Bus loads can be connected via line M1M2 without an additional level converter. A level converter is required, however, as soon as the network nodes are connected via line ABC.
Shorter lifecycle of network nodes
Reading out device data on the network node via M-bus IoT gateway requires additional electricity. This reduces the lifecycle of battery-operated WT.. Nodes compared to other network nodes on the network.
We recommend reading out the network nodes at most once a day since reading out data can increase battery use by ca. 5%.
- Disconnect communications directly on the WTX16.. between the devices upper section (gateway) and the lower section (network nodes, if you intend to read out an existing wireless network with the WTX16.. gateway via the M-Bus IoT gateway. Parallel reading is not possible and can destroy the devices.
- Connect the M-bus IoT Gateway to the network nodes (lower section). The network nodes are still powered with voltage in the upper section.
M-Bus IoT gateway with level converters and district heating controllers
Up to 250 RVD2.._district heating controllers can be connected per line to a M-bus IoT gateway. The M-bus IoT gateway and RVD2.. controllers communicate over M-bus.