Circutor CEM-M-RS-485 Manual do Utilizador descarregar pdf (Página 11)

4�- OPERATION

The CEM M-RS485 is designed to be used as a RS-485 electrical port for any device in the

CEM family, using the mechanical coupling next to the optical port.

4.1.- OPERATING PRINCIPLE

The CEM M-RS485 is an optional accessory for electrical energy meters from the CEM range

that are mounted on DIN rails.

The CEM M-RS485 provides CEM units with RS-485 communications with the MODBUS

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-RS485 assembly functions as

a single device.

This assembly operates the same as any standard slave device with a RS-485 bus, responding

to MODBUS requests from the bus's master peripheral.

4.2.- LED INDICATORS

The unit has three indicator LEDs:

POWER

LINK

COMS

Figure 5:CEM M-RS485 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)

Instruction Manual

CEM M-RS485

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Circutor CEM-M-RS-485 Manual do Utilizador Página 11