Circutor CEM-M-ETH Manuel d'utilisateur télécharger pdf (Page 12)

Table 3:LINK LED, colour codes

LINK LED

Colour Status

Flashing red Unit not linked

Steady green Unit linked

 LED LINK/ACT, indicates the state of the Ethernet connection, Table 4�

Table 4: LED LINK/ACT

LED LINK/ ACT

Colour Status

On Ethernet link

Off No Ethernet link

Flashing

Activity on this port

4.3.- OPTICAL COMMUNICATIONS PORT

The unit has an optical serial communications port on its right side, in accordance with the UNE

EN 62056-21:2003 standard, in order to communicate with other devices in the CEM family.

4.4- RS-485 COMMUNICATIONS

4�4�1�- MODBUS/TCP PROTOCOL

The MODBUS/TPC protocol is the MODBUS RTU protocol with a TCP interface that runs on

Ethernet.

MODBUS/TCP uses TCP/IP and Ethernet to manage the data of MODBUS messages between

compatible devices.

The MODBUS/TCP protocol embeds a standard MODBUS data frame in a TCP frame without

the Modbus checksum, as shown in the diagram in the gure.

Figure 6:Construction of a MODBUS/TCP data frame

CEM M-ETH

Instruction Manual

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Circutor CEM-M-ETH Manuel d'utilisateur Page 12