Guide to networking
The network
7
Chapter 3
The network
3.1
Physical layer
The connection of several control panels in network is based on an RS485 network, which must be structured
in ring topology in order to guarantee the appropriate fault tolerance along the cable lines.
Each control panel connected in network must be equipped with an IFMNET module.
The connection of two or more control panels in a network can be achieved by means of two RS485
communication ports (
[B], [C]
).
Cables:
2 wire shielded cable
Typical impedance 12Ohm
Maximum length 1000m (between two successive control
panels)
Compliant with local laws and regulations in force
The connection must be a loop connection and must respect the direction of the wiring: the terminals on the terminal
board of PORT-B must be connected with their counterparts on the terminal board of PORT-A of the next control panel;
whereas, the terminals on the terminal board of PORT-A must be connected to their counterparts on the terminal board
of PORT-B of the previous control panel.
[A]
Status LED
[B]
Port-A
Connection terminal for
port A
[C]
Port-B
Connection terminal for
port B
[D]
12V
Terminals for the power
supply to the RS485/fiber
converter
A
B
C
D
2
1
Port-A
3
D-
-
D+
2
1
Port-B
3
D-
-
D+
2
1
Port-A
3
D-
-
D+
2
1
Port-B
3
D-
-
D+
2
1
Port-A
3
D-
-
D+
2
1
Port-B
3
D-
-
D+