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Connection
IMPORTANT
Observe polarity.
IMPORTANT
Remember the characteristics of the standard EIA-485 bus:
• Maximum distance of 1200 meters (0.75 miles).
• Maximum of 32 devices connected to the bus.
• A 120 ohms (Ω) termination resistor is needed at each end of the bus. The gateway has an internal
bus biasing circuit already incorporating the termination resistor. It can be enabled using the DIP
switch block (SW A) dedicated to the EIA-485 port:
Position 1
– ON: 120 Ω termination active.
– OFF: 120 Ω termination inactive.
Positions 2 and 3
– ON: Polarization active.
– OFF: Polarization inactive.
For further details, see
IMPORTANT
When installing the gateway at the end of the bus with the termination resistor enabled, do not
install an additional termination resistor at that end.
NOTE
See the
Wiring diagram (page
5.2.4. Connection Procedure for KNX
Connect the KNX TP communication cable to the gateway's KNX port.
IMPORTANT
Observe polarity.
NOTE
See the
Wiring diagram (page
5.2.5. Connection Procedure for BACnet
For BACnet/IP:
Connect the BACnet/IP Ethernet cable to the gateway's Ethernet Port. The correct cable to use depends on
where the gateway is connected:
• Connecting directly to a BACnet/IP device: use a crossover Ethernet UTP/FTP CAT5 or higher cable.
USER MANUAL Version 1.0.7
DIP Switches (page
17).
10).
10).
Fujitsu VRF systems with KNX, Serial and IP support
Page 13 of 41
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