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Central Control System
485 Communication Central Control
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
(Master/Slave 방식)
RS-485 Communication Features
Allows for multi-drop communication, enabling up to 32 transmit/receive units.
Capable of transmitting up to 1.2 km at 100 kbps
The optimal choice or serial communication in environments with distributed equipment across multiple networks, dealing with noise and using numerous devices
The 2-wire system allows for construction at a lower cost than other wired systems.
When connecting more than 32 products, a separate MCU is required, and the MCU also has 32 communication points.
| Item | RS-485 | PLC (Power Line Communication |
|---|---|---|
| Communication Method | Dedicated communication cable |
Power lines used for communication High-speed power line Ethernet communication |
| Signal Reach |
1.2 km per device Communication speed deceases depending on distance |
300m per device 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 Speed |
9600~38,400bps |
Physical speed 200Mbps Typically 40~80Mbps |
| Control Quantity |
Limited control Up to 32 devices per master For more than 32 devices, MCU is needed Up to 32 devices per MCU |
Up to 25,600 devices for a single network |
| Signal Converter |
RS-232 – RS-485 conversion |
No separate converter required |
| Installation Equipment |
Communication PCB by product MCU installation by zones (24-32 units) RS-485 or Ethernet communicationn betweenMCUs |
Communication PCB by product 3-phase power line communication mode 3-phase/single-phase power line coupler Blocking filer Signal amplifier (intalled depending on field onditions) |
| Individual OperatingStatus |
Potential issues when controlling large quantitie depending on the communication speed due o FCU quantity anddistance |
PC control available Use of high-speed Ethernet communicationn Individual control and monitoring available |
| Wired Remote Control |
Up to 16 device connection Master(1 ea) + Slave(15 ea) |
Up to 32 device connection Master(1 ea) + Slave(15 ea) |
| Wired Remote Control Connectio |
4-wire power and communication lin |
2-wire power supply using communication lin |
| Structural Change |
Line work required when changing the officetructure Adjust the FCU ID for each product by adjusting the ADD witch on the PCB installed on the product |
Adjust the FCU ID for each product by adjusting the ADD witch on the PCB installed on the product |
| Features |
New construction buildings : Piping work taking into account communication Existing buildings : Many obstacles exist when installing communication lines. |
No separate communication line work required Network equipment related to communication must be installed on the FCU power line |
