Connection Procedure - HMS Networks Intesis IN485HIT001R000 User Manual

Connection Procedure

6.2. Connection Procedure
CAUTION
Disconnect all systems from the power source before connecting them to the gateway.
IMPORTANT
Keep communication cables away from power and ground wires.
Figure 3. Wiring diagram
USER MANUAL Version 2.0.4
BACnet MS/TP and Modbus RTU Server Gateway for Hitachi
Connection to the wired remote controller bus
1. Mount the Intesis gateway in the desired installation site.
2. Connect the gateway at any point of the AB bus.
NOTE
• The AB bus is a two-wire bus that connects the AC indoor unit and the
wired remote controller.
• This connection has no specific polarity.
If the AC unit has a wired remote controller (RC), you can:
• Set the wired RC as header and the gateway as follower.
• Set the wired RC as follower and the gateway as header.
NOTE
You can configure this behavior via the DIP switch SW1. See
(page 58).
IMPORTANT
Although it is not mandatory, we recommend connecting a wired remote
controller in the RC bus since it may be necessary to establish proper
communication with some indoor units.
Connection to the BACnet MS/TP or Modbus RTU bus
3. Connect the BACnet MS/TP or Modbus RTU bus to the EIA-485 port of the gateway.
IMPORTANT
Observe polarity: B-, A+, and SG for signal ground.
IMPORTANT
• EIA-485 bus doesn't allow loop or star topologies.
• Maximum length for the EIA-485 bus is 1200 meters.
4. Reconnect all systems to their power source.
DIP Switches
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