INTRODUCTION
CMeX20W enables ABB electricity meters with IR interface to
communicate via Wireless M-Bus. The communication is automatically
configured between CMeX20W and the ABB meter. CMeX20W allows
transmission of meter values from the ABB meter via a standardized
interface that can be handled by all receivers on the market that
complies with the M-Bus standard.
OVERVIEW
1.
DIN lock
2.
Antenna connection
3.
Serial number
CMeX20W
4.
Power supply L
5.
Power supply N
6.
IR interface
7.
LED
8.
Push button
MOUNTING
CMeX20W should be mounted on a DIN rail, to the left of the ABB
electricity meter. The metallic clip on the bottom is used to mount
and demount the unit from the DIN-rail. For safety reasons, a DIN-rail
enclosure must cover the terminals.
CMeX20W should be equipped with an antenna mounted on the
SMA connector (2). The included mini stub antenna works in most
installations. If CMeX20W is mounted in a metal cabinet, it may require
an external antenna that can be ordered from Elvaco.
POWER SUPPLY
The installation should be performed by a qualified electrician or an
installer with the required knowledge. The power supply must be
protected with a 10 A circuit breaker of characteristic C or slow blow
fuse. The power supply should be connected via a clearly marked, easily
accessible and nearby switch so the unit can be switched off during
service work.
Main supply should be connected to screw terminals (4) and (5). Main
supply voltage should be in the range of 220-240 VAC, 50 Hz.
OPERATION AND FUNCTION
After power up, the CMeX20W will try to communicate via the IR port
with the electricity meter that is mounted to the right of the product.
Before communication is established with the meter, the red LED (7) is
on. In this mode, no wireless M-Bus messages are sent from CMeX20W.
CMeX20W can be configured to either send encrypted or unencrypted
messages. By pressing the push button (8) for at least 5 seconds, the
transmission is changed between encrypted and unencrypted mode. In
encrypted mode, the LED (7) lights up yellow and in unencrypted mode,
the LED lights up green.
When transmitting data, the LED is flashing (turned off) for 0.5 s.
CMeX20W uses the Wireless M-Bus mode T1. The product supports
both encrypted and unencrypted messaging. Encrypted mode means
that the Wireless M-Bus messages are protected with a 128 bit AES key.
When CMeX20W has created a connection to the electricity meter, the
LED changes color from red to green in unencrypted mode, and yellow
in encrypted mode. The CMeX20W now starts sending readings once
every 16 seconds. The LED flashes (turns off for 500 ms) every time a
wireless message is sent.
When a meter change is performed, the CMeX20W is automatically
configured. Wait for green or yellow LED to light up which indicates that
CMeX20W has contact with the new meter.
CMeX20w
External MCM for ABB B21/B23/B24, Wireless M-Bus
