Wireless wM-Bus Meter Reading (868 MHz)
wM-Bus (EN 13757-4) lets a meter transmit its readings without any wiring, over the 868 MHz band used across the EU. Here's how it works — and when a DIY setup at home actually makes sense.
How it works
Check your meter's documentation
Find out whether your meter transmits wM-Bus data at all, in which mode (S, T or C), and whether that data is open or encrypted.
Pick a matching receiver
A USB or network wM-Bus receiver needs to match your meter's transmission mode and the 868 MHz band.
Place the receiver near the meter
Connect it to a computer or home server and position it so it reliably picks up the meter's signal.
Read and decode the data
If the meter's data isn't encrypted, software can decode it into readable consumption values — heat, water, gas or electricity.
What to know about wM-Bus
MHz in the EU
Wireless M-Bus (EN 13757-4) operates in the 868 MHz band across the EU — a shared frequency used by several types of utility meters.
No cabling required
Unlike wired M-Bus, the meter broadcasts its data over the air — no bus cable to run to every device.
Three transmission modes
S mode is stationary, two-way, less frequent; T mode sends frequent one-way transmissions, typical for battery-powered meters; C mode uses more efficient encoding for longer battery life.
Not every meter is the same
Many utilities and operators use encryption or access restrictions — check the specific meter's documentation before buying instead of assuming universal compatibility.
Reception depends on conditions
There's no general figure for reception range — it depends on the specific meter, receiver, and building construction.
Can be integrated further
Gateways can convert wM-Bus data to other protocols, such as Modbus or BACnet, so readings can feed into a BMS or other building automation system.
DIY wireless reading starter set
A basic starting point — always check your meter's compatibility before you buy.
- 868 MHz USB or network wM-Bus receiver
- Antenna for reception range
- Recommended decoding software
- Setup guide
- Pre-purchase compatibility check
Frequently asked questions
How does wM-Bus differ from wired M-Bus?
Wired M-Bus uses a physical two-wire bus, while wM-Bus (EN 13757-4) sends the same kind of data without wires, over the 868 MHz band.
Will my meter work with a DIY receiver?
Not always. Many meters transmit encrypted or access-restricted data depending on the utility's or operator's policy — check your meter's documentation before buying.
What are the wM-Bus transmission modes?
The standard defines S (stationary, less frequent, two-way), T (frequent one-way transmissions) and C (more efficient encoding) modes — your meter uses one of these.
Are M-Bus and Modbus the same thing?
No — they're two completely different standards, despite the similar names. M-Bus (EN 13757) is a European standard built specifically for utility meter reading, while Modbus is a general industrial protocol used across a wide range of devices.
Can wM-Bus data connect to home automation?
Yes — with the right gateway, wM-Bus data can be converted to other protocols, such as Modbus, and integrated into an existing system.
Curious about wireless meter reading?
Browse wM-Bus receivers in the shop, or learn more before deciding if it fits your setup.