B544(E) - Hisense YXE-A03U Technical & Service Manual

4. Control BOX (B544(E))
4.4 Central Control Adaptor (B544(E))
Important Notice
1
Please read the Important Notice in these Installation Instructions supplied with the product, and
perform installation in accordance with these instructions properly.
The central control adaptor is a dedicated device that can be directly connected with the
indoor unit for converting communication protocols and connects the indoor unit to central
control network.
Precautions for arrangement:
1. The design and installation of the central control adaptor should be performed under the unified
planning for central control system. The installation location of the central adaptor, electrical
distribution and wiring, address assignment, connection with Modbus monitor and indoor unit
should be planned in advance.
2. Cables for central control and distribution lines shall not be too close to each other or routed in the
same conduit. RS-485 bus should be arranged as far away from interference sources as possible,
especially high voltage interference sources, such as transformer and frequency converter. For
other relevant precautions, see the requirements for wiring of building automation system.
3. The equipment on either end of the group control bus must be provided with terminal-matched
resistor.
4. The central control line must be configured as a daisy-chain bus topology. If a star-type or tree
topology is required, it is recommended to use RS-485 hub and RS-485 repeater.
5. The central control adaptor should be installed close to the electronic control adaptor of the indoor unit.
6. The baud rate of the adaptor must be set the same with Modbus/ BACnet monitor.
7. The addresses for the central control adaptor should not be repeated.
8. The maximum allowable length of the connecting cable between the indoor unit and the central
control adaptor is 40m, and the maximum allowable length of RS485 control cable is 1000m.
Wiring diagram
Wired
controller
Transmitting cable between
indoor and outdoor unit
Outdoor unit
Wiring diagram for centralized control system (BACnet/ModBus)
Central control
adaptor
Connecting cable
NOTE: Be sure to insert the connecting cable into the wired controller port of indoor unit PCB board.
Wiring diagram for twin system
RS485 shielded twisted pairs (with polarity, A+ B-)
A+A+B-B- A+A+B-B-
Central control Central control
adaptor adaptor
Indoor unit(master)
unit(slave)
RS485 shielded twisted pairs (with polarity, A+ B-)
···
···
A+A+B-B- A+A+B-B-
Central control
adaptor
Interface
Indoor unit
Indoor unit
If you still have any trouble, please contact local service center of our company for further information.
···
···
A+A+B-B-
Central control Central control
adaptor
Indoor
Indoor unit(slave)
···
···
A+A+B-B- A+A+B-B-
Central
RS485
control
adaptor
Modbus/
BACnet
monitor
Indoor unit
102
A+A+B-B-
adaptor
Indoor unit(slave)
A+A+B-B-
Central
control
adaptor
Indoor unit