CIRCUTOR CEM-M-ETH - Manual (Page 11)

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 )
11 Instruction Manual
CEM M-ETH