Figure 1 CMeX50 overview
4.2 Mounting
The product should be mounted on a DIN-rail. The DIN-lock (11) on the bottom is used to mount and
demount the unit from the DIN-rail. To fully comply with safety regulations, a DIN-rail enclosure must
cover the terminals.
4.2.1 M-Bus master port
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 wiring to the screw connector (7). Do not exceed the
maximum cable length of 1000 meters.
IMPORTANT
Please take the following in consideration:
• The product handles 32 slaves. Overloading the bus will show an error message on the display
and turn off the M-Bus bus.
• All connected M-Bus slave devices must have unique primary or secondary M-Bus addresses
depending on addressing mode used.
4.2.2 M-Bus slave ports
The product is equipped with four different M-Bus slave ports (IR interface left (13), RS232 (9), USB (10)
and M-Bus slave interface (12)) to enable wide integration. These ports can be used to:
1. Read the connected wireless M-Bus slaves as normal M-Bus slaves
2. Read the connected wired M-Bus slaves (transparent)
Slaves can be read using primary and/or secondary addressing. The CMeX50 itself is available as an M-Bus
slave with the secondary address equal to the serial number.
4.2.2.1 IR interface
The IR interface is used as a standard transparent M-Bus interface over IR. This port can be used together
with M-Bus Metering Gateway products from Elvaco, i.e. CMe2100 and CMe3000. In this way it is
possible to extend the product with TCP/IP and GPRS communication.
4.2.2.2 RS232 interface
The RS232 interface is used as a standard transparent M-Bus interface over RS232. Use the included
RS232 cable (RJ45 to D-SUB9) and connect to any standard RS232 D-SUB9 connector.
4.2.2.3 USB interface
The USB interface is used as a standard transparent M-Bus interface over USB. Use the included USB
cable and connect to any standard USB master port. When using Microsoft Windows® operating systems,
a virtual comport will automatically be generated when connecting the product to the computer.
Additional USB drivers can be downloaded from the Elvaco web site: www.elvaco.com.
4.2.2.4 M-Bus 2-wire interface
The M-Bus 2-wire interface acts like any other M-Bus slave device on the 2-wire bus. The nominal current
is 1T (1.5mA). This interface can be directly used with any standard M-Bus master device.
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