M-Bus Level Converter
CMeX10S - CMeX13S
Product categories
Water,
Heat / Cooling,
Electricity
Water
Drinking Water
Heat / Cooling
Electricity
System technology
Wired
M-Bus,
Modbus
Instruments
Smart City
Smart Building
Your benefits
- Transparent mode of operation:
Unchanged transfer of read-out data to the communication device - IR interface for modular extension:
No need to replace the level converter when connecting additional measuring points, investment protection - RS232 interface for communication with PC:
Transparent communication between level converter and PC - 100-240 V AC mains power required:
No extra power supply necessary - Operating status display via LED:
Easy on-site analysis and troubleshooting
Applications
- Remote supply and remote reading of M-Bus end devices

Properties
- Signal converter from M-Bus to RS232
- DIN mounted, modular and expandable – future proof solution
- Stackable modular design M-Bus level converter for 32, 64, 128 or 256 M-Bus end devices with a standard load of 1,5 mA
- With the IR-Enabler (CMeX40) it is possible to extend existing M-Bus installations for additional M-Bus loads
- Several extension modules (additional M-Bus loads) which are mounted to the right (IR interface) of the module are available
- M-Bus protocol according to EN 13757-3
- Transfer rates: 300, 2400 Bit/s
- M-Bus short-circuit protection
- 100-240 V AC power supply
- Operating indicator with LED
Product information

Technical Data
M-Bus Level converter with RS232 1) | Extension Modules for CMeXxxS | |||||
---|---|---|---|---|---|---|
CMeX10S | CMeX11S | CMeX12S | CMeX13S | CMeX10 | CMeX11 | |
Mechanics | ||||||
Dimensions (HxWxD) | 90x108x65 mm (6 DIN-Modules) | 90x36x65 mm (2 DIN-Modules) | ||||
Weight | app. 220 g | app. 100 g | ||||
Installation | Hat rail TS35 (EN 50022) / DIN mounted | |||||
Casing material | Polyamide | |||||
Protection class | IP20 | |||||
Terminals | ||||||
Power supply | L, N, Protective Earth Screw terminal cable 0,75 - 2,5 mm2 0,5 Nm tightening torque | L, N Screw terminal cable 0,75 - 2,5 mm2 0,5 Nm tightening torque | ||||
M-Bus | Pin terminal solid wire Ø 0,6 - 0,8 mm and Screw terminal cable 0,25 - 2,5 mm2 0,5 Nm tightening torque | Pin terminal solid wire Ø 0,6 - 0,8 mm | ||||
RS232 | RJ-45 | Not available | ||||
Electrical | ||||||
Nominal Voltage | 100…240 V AC / ± 10% / (50/60 Hz) | |||||
Power consumption (max.) | 25 W | 3 W | ||||
Power consumption (nom.) | 1,5 mA x M-Bus-Loads + 1 W | |||||
Installation category | CAT 3 | |||||
M-Bus specifications | ||||||
M-Bus standard | EN 13757 | |||||
M-Bus baud rate | 300, 2400 Bit/s | |||||
Maximum connected M-Bus-Loads (each 1,5 mA) | 32 | 64 | 128 | 256 | 32 | 64 |
Maximum cable length | 1000 m 2) | |||||
Maximum load capacitance | 1,5 μF | |||||
Bus voltage (nom.) | 42 V DC | 28 V DC | ||||
IR Interface for extension modules | Yes | |||||
Extension possibilities (Additional M-Bus Loads) | Yes (Maximum of 4 CMeX-modules side by side) | |||||
Ambient conditions | ||||||
Operating temperature range | -30 to +55 °C | |||||
Storage temperature range | -40 to +85 °C | |||||
Humidity | 80% at temperatures up to 31 °C, decreasing linearly to 50% at 40 °C | |||||
Pollution Degree | 2 | |||||
Approvals | ||||||
EMC | EN 61000-6-2, EN 61000-6-3 | |||||
Safety | EN 61010-1, CAT 3 |
1) Can be used as an extension module (additional M-Bus loads).
2) The maximum possible network reach (entire cable length) as well as the distance to the M-Bus end devices depends greatly on the network topology, the number of connected devices, the cross-section of the used cables and the transfer rate.