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Connection
5.2.3. Connection Procedure for Modbus
NOTE
Remember to check the
For Modbus TCP:
1. Connect the Modbus TCP Ethernet cable to the gateway's Ethernet Port.
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
When commissioning the gateway for the first time, DHCP will be enabled for 30 seconds.
After that time, the default IP 192.168.100.246 will be set.
For Modbus RTU:
1. Connect the Modbus RTU 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 (SW A) 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
If the termination resistor is enabled and you install the gateway at an end of the bus, do not
install an additional termination resistor at that end.
USER MANUAL Version 1.2
Common Connections (page
DIP Switches (page
19).
Mitsubishi Heavy Industries VRF with KNX, Serial and IP support
12).
Page 13 of 36
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