HMS Networks Intesis IN775FGL00XO000 User Manual page 17

Fujitsu VRF systems with KNX, Serial and IP support
• Connecting to a hub or switch of the LAN of the building: use a straight Ethernet UTP/FTP CAT5 or higher
cable.
NOTE
Some devices detect the difference automatically and adjust themselves.
NOTE
When commissioning the gateway for the first time, DHCP will be enabled for 30 seconds. During
that time, if there is a DHCP server, an IP address will be automatically assigned to the gateway. If
there is no DHCP, you can type an IP address of your choice. After that time, the default IP address
192.168.100.246 will be automatically set.
IMPORTANT
If communicating through the LAN of the building, contact the network administrator and make sure
traffic on the used port is allowed through all LAN paths.
For BACnet MS/TP:
Connect the BACnet MS/TP communication cable to the gateway's EIA-485 port.
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 termination resistor of 120 ohms (Ω) 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 dedicated to the EIA-485 port:
Position 1
– ON: 120 Ω termination active.
– OFF: 120 Ω termination inactive.
Position 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
Page 14 of 41
DIP Switches (page 17).
10).
Connection
USER MANUAL Version 1.0.7