Elvaco CMeX20 Manuals
1 pdf manual(s) Elvaco CMeX20 for free download (Document Types: Manual )
Elvaco CMeX20 Manual [PDF] (2 pages)
- Identifier: id-1870308
- Brand: Elvaco
- Device: CMeX20 Gateway
- Type: PDF
- Key Aspects: Safety Recommendations and Warnings, Technical Support and Resource Links, Component Overview and Descriptions
- UPD Date: 19.05.2026
- Source File: 1852454.pdf
- Pages: 2
- Description: Installation instructions for the Elvaco CMeX20.
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INTRODUCTION CMeX20 is a DIN-mounted External MCM that converts IR to M-Bus. It enables standard M-Bus communication for all CMeX Series products and DIN-mounted ABB electricity meters using IR interface. For a complete description of the product or for information in Swedish, visit the Elvaco AB website, www.elvaco.com. OVERVIEW CMeX20 External MCM for ABB B21/B23/B24, M-Bus 1. Serial number (secondary address) 2. LED 3. M-Bus connector 4. M-Bus in 5. M-Bus in 6. M-Bus out 7. M-Bus out MOUNTING The CMeX20 is mounted on a DIN-rail. The metallic clip on the bottom is used to mount and demount the unit from the DIN-rail. Mount the CMeX20 on the left side of an ABB electricity meter or another CMeX Series product. M-BUS 2-WIRE BUS M-Bus is a multi-drop 2-wire bus with no polarity. Use a cable of area 0.25-1.5 mm2, e.g. a standard telephone cable (EKKX 2x2x0.5). Connect the M-Bus 2-wire to the screw terminals (4) and (5) or pin terminal (3). IMPORTANT • All connected M-Bus slave devices must have unique M-Bus secondary or primary addresses depending on addressing mode. • Measure voltage over M-Bus slave connection to verify M-Bus master connection. Voltage should be between 21-42 VDC. LED INDICATIONS The product is equipped with a single orange LED, which shows communication status. Orange LED Mode Product state Visual Permanently on M-Bus connected Flashing M-Bus communication TROUBLESHOOTING Product does not respond to M-Bus master commands Please verify your M-Bus slave configuration and connection: • Voltage over M-Bus connection should be between 21 VDC and 42 VDC. • All M-Bus slaves connected to the M-Bus master must have unique primary addresses or secondary addresses depending on addressing mode. • Verify M-Bus slave baud rate used by M-Bus master. M-Bus master baud rate must be identical to M-Bus slave baud rate. SAFETY The warranty does not cover damage to the product caused by usage in any other way than described in this manual. Elvaco AB can not be liable for personal injury or property damage caused by usage in any other way than described in this manual.
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