CIRCUTOR CVM-B Series - Manual (Page 259)

7.5.- MODBUS/TCP BRIDGE COMMUNICATIONS MODULE
The M-CVM-AB-Modbus TCP ( Bridge) is a communications module for connecting the
CVM-B units to a Modbus/TCP network and as an Ethernet to RS-485 gateway.
Modbus/TCP is a communications protocol designed for enabling industrial units to
communicate with each other on Ethernet networks using TCP/IP protocols.
Basically, Modbus/TCP encapsulates a Modbus frame within a TCP frame, making it possible
to configure and monitor a unit via the Internet.
The communications module is also equipped with an RS-485 gateway.
7�5�1�- CONNeCTION TeRMINALS
Table 125:List of terminals, Modbus TCP ( Bridge ) communications module�
Terminals in the unit
1: Ethernet 3: B(-), RS-485
2: A(+), RS-485 4: S, GND for RS-485
1 4 2 3
figure 177: Modbus TCP ( Bridge) communications module terminals
7�5�2�- LeDs
Table 126: List of LeDs, Modbus TCP (Bridge) communications module�
LeD Status function
LINK / ACT
On Unit connected to the network
Off Unit disconnected from the network
Blinking light Activity on the bus
SPeeD
On 100 BT
Off 10 BT
SPEED LINK/ACT
figure 178: LeDs Modbus TCP� (Bridge)
259 Instruction Manual
CVM-B100 - CVM-B150