What is Wireless M Bus?
This page describes what is wireless M Bus and mentions Wireless Meter Bus basics. It mentions wM-Bus kits (hardware and software).
The full form of wM-Bus is Wireless Metering Bus. It is specified in EN13757-4 standard. This standard mentions communication between meter and other components. The system components include read-out devices and data collectors. These devices can be stationary or mobile.
The figure depicts Wireless M-Bus communication system block diagram. The communication between meter and other system components can be either one-way or two-way. There are different physical layer modes. These wM-Bus PHY modes are mentioned in the table-1. The PHY modes are S-mode, T-mode, R-mode, N-mode, C-mode, F-mode etc.
| WM-Bus PHY Mode | Description |
|---|---|
| S-Mode(Stationary Mode) | S1-Mode(One way) S1m-Mode(One way) S2-Mode (two way) |
| T-Mode (Frequent Transmit Mode) | T1-Mode (one way) T2-Mode(two way) |
| R-Mode (Frequent Receive Mode) | R2-Mode (two way) |
| N-Mode (Stationary Mode) | N1 Mode(one way) N2 Mode (two way) N2g-Mode(two way) |
| C-Mode (Frequent Transmit Mode) | C1 Mode (one way) C2 Mode (two way) |
| F-Mode (Frequent Transmit Mode) | F1 Mode (one way) F2 Mode (two way) |
wM-Bus frequency bands
Following table-2 mentions wM-Bus modes and their SRD frequency bands.
| wM Bus Mode | SRD Frequency Band |
|---|---|
| S1-Mode, S2-Mode | 868 MHz |
| T1-Mode, T2-Mode | 868 MHz |
| C1-Mode, C2-Mode | 868 MHz |
| R2-Mode | 868 MHz |
| N1-Mode, N2-Mode | 169 MHz |
| F1-Mode, F2-Mode | 433 MHz |
Wireless M-Bus(wM-Bus) Kits
TEXAS INSTRUMENTS have CC112x and CC120x series supporting Wireless M-Bus Transceiver functionalities. It supports frequency bands 868,433 and 169MHz. It is ETSI 300-220 V2.3.1 compliant.
RENESAS has developed wireless M-Bus protocol stack.
They have Wireless M-Bus interface board which supports following features.
• It supports T1,S1,T2,S1-m,C1,S2,C2,N1,F2 and N2 modes as per
EN 13757-4 standard document. The WM-Bus Kit supports 169 and 868 MHz frequency bands.
The protocol stack source code is available.In addition software
libraries of data-link layer and application layer is also available.
Wireless M-Bus tutorial
Refer Wireless M-Bus tutorial>> which covers following:
• System Features
• WM-Bus network
• WM-Bus Protocol Stack
• WM-Bus Frame formats A and B
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