Wireless M Bus - LoRaWAN Bridge (ELB-100)
OMS/EN 13757 Wireless M-Bus to LoRaWAN protocol bridge with secure 5G/4G Blackhaul
5G/4G Backhaul
Secure · Rugged
Industry Grade
Key feaures
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Converts OMS Wirelss M-Bus Modes (T/C/S/N) to LoRaWAN uplinks
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Edge parsing, decryption (AES-128), and payload normalization
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LoRaWAN B/16 channel compatible servers; adaptive data rate
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5G NR (NSA/SA) & LTE Cat 4/Cat M1 blackhaul with dual SIM failover
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Local RS-485/Modbus, Ethernet (PoE) and Web UI/SNMP Management
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TLS 1.3, VPN (Wireguard/IPSec), Secured Boot & Signed OTA
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Technical Specifications
Wireless M-Bus
EN-13757-4 (OMS), Modes (T,C,S,N), 868/915 MHz
LoRaWAN
1.0.4/1.1; EU868/US915/AS923; +20dBm max
Blackhaul
5G NR SA/NSA; LTE Cat-4/6; Cat-M1/NB-IoT (option); Dual SIM
Compute
Quad‑core ARM @ 1.2 GHz, 1 GB RAM, 8 GB eMMC
I/O
1 x Ethernet (PoE 802.3af), 1 x RS 485,, 1 x USB
Power
9–36 V DC or PoE; <4 W typical
Mechanical
IP67, 160×110×45 mm, UV Resistant
Security
TLS 1.3, AES 128/256, Secure Boot, TPM 2.0 (option)
Experimental results (Internal lab)
PER vs RSSI (W-M Bus to LoRaWAN)
Tested in an anechoic chamber at 868 MHz; payload 64 B; LoRa SF12.
RSSI (dBm) | PER (%) |
|---|---|
-80 | 0.2 |
-100 | 0.8 |
-115 | 2.6 |
-120 | 5.9 |
End to End Latency
From W-M-Bus packet receive to LoRaWAN uplink acknowledged at NS.
Backhaul | Median (ms) | P95 (ms) |
|---|---|---|
5G SA | 110 | 210 |
5G NSA | 135 | 250 |
LTE Cat-4 | 260 | 520 |
Cat-M1 | 480 | 900 |
Power Profile
DC Input @ 12V; ambient 25 °C ; averages across 24 hours duty cycle
Mode | Power (W) |
|---|---|
Idle | 2.3 |
Bridge Active | 3.6 |
Cellular TX Peak | 5.1 |
Failover behaviour
Dual-SIM switchover when backhaul drops for >5s
Scenario | Recovery Time (s) | Packet Loss |
|---|---|---|
5G → 4G failover | 3.8 | <0.5% |
4G → 5G restore | 6.1 | <0.3% |
-40°C…+70°C
Operating Temp
IP67
Enclosure Rating
Dual SIM
5G/4G Failover
Use Cases
01
Water/Gas/Heat meter backhaul in mixed-technology neighbourhoods
02
Rapid migration where LoRaWAN coverage exists alongside OMS meters
03
Campus utilities with centralized LoRaWAN network servers