Page 16 - Fan Coil Unit

FAN COIL UNIT / AIR CONDITIONING

485 Communication Central Control (RS-485)

This is a communication method that uses a 2-wire, half-duplex, multi-point serial connection.
It is a communication method where the main control unit sends and receives commands to and
from each device by varying the transmission and reception times. In this method, all devices are
connected in series for communication.
(Master/Slave Method)

>> Features of 485 Communication

01 02 03

Allows for multi-drop Capable of transmitting up to The optimal choice for serial
communication, enabling up to 1.2 km at 100 kbps communication in environments
32 transmit/receive units. with distributed equipment across
multiple networks, dealing with
04 05 noise and using numerous devices

The 2-wire system allows for When connecting more than
construction at a lower cost than 32 products, a separate MCU is
other wired systems. required, and the MCU also has
32 communication points.

Comparison of Communication Methods

Item RS-485 PLC (Power Line Communication)
Communication Power lines used for communication
Method Dedicated communication cable High-speed power line Ethernet communication
1.2 km per device 300 m per device
Signal Reach
Communication speed decreases depending on distance Decreases due to the reduced power signal
Communication Line
Construction Requires dedicated cable line construction No line construction required due to use of power lines
Communication 9600-38,400 bps Physical speed 200 Mbps
Speed Typically 40-80 Mbps
Limited control
Up to 32 devices per master
Control Quantity Up to 25,600 devices for a single network
For more than 32 devices, MCU is needed
Up to 32 devices per MCU
Signal Converter RS-232 – RS-485 conversion No separate converter required
Communication PCB by product
Communication PCB by product 3-phase power line communication modem
Installation MCU installation by zones (24-32 units) 3-phase/single-phase power line coupler
Equipment RS-485 or Ethernet communication between MCUs Blocking filter
Signal amplifier (installed depending on field conditions)
Potential issues when controlling large quantities PC control available
Individual Operating depending on the communication speed due to FCU quantity and Use of high-speed Ethernet communication
Status
distance Individual control and monitoring available
Up to 16 device connections Up to 32 device connections
Wired Remote Control
Master (1 EA) + Slave (15 EA) Master (1 EA) + Slave (15 EA)
Wired Remote Control 4-wire power and communication line 2-wire power supply using communication line
Connection
Line work required when changing the office structure When changing the office layout, it only requires setting the IP
Structural Change Adjust the FCU ID for each product by adjusting the ADD switch on by group or product
the PCB installed on the product
New construction buildings: Piping work taking into account No separate communication line work required
communication line work is required
Features Network equipment related to communication must be
Existing buildings: Many obstacles exist when installing installed on the FCU power line
communication lines.

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