Elvaco CMeX20 User manual

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 conguration 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.

© 2020, Elvaco AB. All rights reserved. The documentation and product are provided on an “as is” basis only and may contain deciencies or in-
adequacies. Elvaco AB takes no responsibility for damages, liabilities or other losses by using this product. No part of the contents of this manual
may be transmitted or reproduced in any form by any means without the written permission of Elvaco AB. Printed in Sweden.
CMeX20 Quick manual A4 English
Document id: 1090033
Version: 4.0
Mechanics
Protection class IP20
Mounting Mounted on DIN rail (DIN 50022) 35
mm
Electrical connections
Supply voltage From M-Bus
Connection M-Bus Screw terminal 0.25-1.5 mm²
Electrical characteristics
Nominal voltage 21-42 VDC through M-Bus
connection, independent of wiring
polarity
Unit loads 3 mA M-Bus 2T
User interface
Orange LED Power/M-Bus activity
M-Bus slave interface
M-Bus baud rate 300 and 2400 Bit/s
M-Bus information All elds in the rst telegram of the
electricity meter
Integration
Meter implementation ABB meters with IR interface
Maximum number of
connected meters
1
Approvals
EMC EN 61000-6-2, EN 61000-6-3
Product Part number Description
CMeX20 1050010 External MCM for ABB B21/B23/
B24, M-Bus
ORDERING INFORMATION
CONTACT INFORMATION
Elvaco AB Technical support:
Phone: [phone]
E-mail: support @elvaco.com
Online: www.elvaco.com
TECHNICAL SPECIFICATIONS
Products:
CMeX12s
,
Products:
Products:
Products:
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CMeX10
CMeX11
CMeX10S
CMeX11S
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EN61000‐4‐4
EN61000‐4‐5
EN61000‐4‐2
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EN61000‐4‐5
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ProductYearo
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LVDDirective2014/35/EU
EMCDirective2014/30/EU
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EN61000‐4‐6(ImmunitytoH
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Elvaco AB, Kabelgatan 2T, S-43437 Kungsbacka, Sweden