Connection Procedure For Bacnet - HMS Networks Intesis IN770AIR00XO000 User Manual

Hitachi VRF with KNX, Serial and IP support

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.
• 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.
The connector for the EIA-485 bus is a green pluggable terminal block labeled SG (signal ground), B-, and A+.
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
Page 14 of 38
DIP Switches (page 17).
Connection
USER MANUAL Version 1.0.6