Connection To Modbus - HMS Networks Intesis IN701-KNX Series User Manual

Connection to Modbus

• Port B EIA-485 connection for BACnet MSTP
Connect the EIA-485 bus to connectors B1 (B-), B2 (A+), and B3 (SNGD) to the Port B of the gateway.
IMPORTANT
Respect the polarity.
IMPORTANT
Remember the characteristics of the standard EIA-485 bus:
– Maximum distance of 1200 meters.
– Maximum of 32 devices connected to the bus.
– A termination resistor of 120 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 switches:
• Position 1
ON: 120 Ω termination active
OFF: 120 Ω termination inactive
• Position 2-3
ON: Polarization active
OFF: Polarization inactive
IMPORTANT
If the termination resistor is enabled and you install the gateway at one of the ends of the bus, do
not install an additional termination resistor at that end.
15.5. Connection to Modbus
• Ethernet port for Modbus TCP and Console connection
Connect the communication cable from the Modbus TCP network to the Ethernet port of the gateway.
IMPORTANT
Use a straight Ethernet UTP/FTP CAT5 or higher cable.
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.
NOTE
After powering up the Intesis gateway for the first time, DHCP will be enabled for 30 seconds.
After that time, if a DHCP server provides no IP, the default IP 192.168.100.246 will be set.
USER MANUAL Version 1.0
IN701-KNX Series
Page 35 of 44