Instructions

4. OPERATION
The CEM M-ETH is designed to be used as a Ethernet port for any device in the CEM family, using the
mechanical coupling next to the optical port.
4.1.- OPERATING PRINCIPLE
The CEM M-ETH is an optional accessory for electrical energy meters from the CEM range that are
mounted on DIN rails.
The CEM M-ETH provides CEM units with Ethernet communications with the MODBUS/TCP protocol.
Once the unit is coupled to the CEM energy meter (See “3.2.- INSTALLATION”) the LINK LED turns green
to let the user know that the link has been made correctly.
From this point onward, the new CEM energy meter + CEM M-ETH assembly functions as a single
device.
4.2.- LED INDICATORS
The unit has three indicator LEDs:
POWER
LINK
LINK / ACT
Figure 5:CEM M-ETH indicator LEDs
POWER LED: Indicates that the unit is connected to a power supply.
LINK LED: Indicates the status of the link with the CEM unit. (Table 3)
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Instruction Manual
CEM M-ETH