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 mm
2
, 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.
