EQ-3 HomeMatic Informações Técnicas descarregar pdf (Página 26)

10.2 Information on connecting the RS485 bus

The following connections are to be made for connecting the HomeMatic Central to

devices of the HomeMatic Wired family:

1. RS485signallines(RS485–AandRS485–B)

2. Shielding or ground connection

Theconnectionrequiresashieldedtwisted-paircable(e.g.eitherstandardCat-5

cableorCat-6cable),suchasisnormallyusedforPCnetworks.

Aprefabricatedconnectingcable(aso-calledpatchcable)orarespectiveRJ-45

plug has the following pin assignments respectively:

Figure 2: 8-pin modular plug connection diagram

Viewfromfront(intotheplugcontacts),catchabove.

Make the following connections, as listed, to connect the HomeMatic Central with

the HomeMatic Wired devices.

The connection of the shielding to the GND connection of the HomeMatic

Wired device is important because faulty functionality can be caused by

potential shifting otherwise.

1 ... ... 8

Wires of the Connection

cable or plug pins

Funktion

Connection to the

HomeMatic Wired device

1 Signal line RS485 - A RS485 - A

2 Signal line RS485 - B RS485 - B

3-8 not connected

Shielding Ground GND

1 2 ... 21 22 23 24 25 26 27 28

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EQ-3 HomeMatic Informações Técnicas Página 26