User Manual

Planning (hardware)
Ethernet
9
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9.5.1 Cable
Desigo Control Point devices are connected over switches and Ethernet cable with RJ45 plugs.
The following conditions must be met:
Bus cable and length:
● Standard Ethernet cable: Min. category 5
● Shielded or unshielded
● STP (Shielded Twisted Pair) or UTP (Unshielded Twisted Pair)
● Length between switch and room automation station: max. 100 m
● Length between room automation stations: Max. 100 m
● Number of devices on a line topology: Max. 20
● For PoE Class 4, the maximum cable resistance is 12 Ω.
Switch: Standard product from IT at 100 Mbps
9.5.2 Power over Ethernet (PoE) PoE
Principle: "Usable signal and power supply on the same cable".
Benefits
Power over Ethernet (PoE) is a simpler solution to supply power to low consumption room operator units. It
saves on power cables and associated installation costs. PoE can be used to connect Ethernet devices in
difficult to access locations or areas where multiple cables are disruptive.
For further information on Power over Ethernet (PoE), see
Ethernet, TCP/IP, MS/TP and BACnet fundamentals
(CM110666).
* Power voltage and current is based on the PoE switch used as well as the number of connected touch panels.
Function
On PoE, Powered Devices (PDs, here: End units) are supplied by Power Sourcing Equipment (PSEs). The
voltage is supplied over the RJ45 plug and twisted pair cable (TP), and by device over:
● Wires that also transmit data
● Unused wires on the RJ45 connection
PoE Switch
PXG3.Wx00-1
PoE Switch
AC 24 V
*
Ethernet
PoE
PXM40...
PoE
PXM50...