B543(E) - Hisense YXE-A03U Technical & Service Manual

Control Box (B543(E))
4.
4.3 Central Control Box (B543(E))
1
Important Notice
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 box 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 box should be performed under the unified
planning for central control system. The installation location of the central box, 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. RS485 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 box should be installed close to the electronic control box of the indoor unit.
6. The baud rate of the adaptor must be set the same with Modbus monitor.
7. The addresses for the central control box should not be repeated.
8. The maximum allowable length of the connecting cable between the indoor unit and the central
control box is 40m, and the maximum allowable length of RS485 control cable is 1000m.
Wiring diagram
Central control box
Connecting
cable
NOTE: Be sure to insert the connecting cable into the Wi-Fi port of indoor unit PCB board.
RS485 shielded twisted pairs (with polarity, A+ B-)
···
···
A+ B- A+ B-
RS485
Interface
Indoor unit Indoor unit
If you still have any trouble, please contact local service center of our company for further information.
···
···
A+ B- A+ B-
Modbus
monitor
Indoor unit
99
A+ B-
Indoor unit