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CHAPTER 5 - MODBUS-RTU COMMUNICATION
5.1 Introduction
This manual is about the specifications, installation and operation of MODBUS-RTU for communication
with PC or FA computer.
5.1.1 Features
Easy use of drives in Factory Automation by user programming
Change and monitoring of drive parameters using computer
5.1.2 Interfacing type of RTU Reference:
- Allows the drive to communicate with any other computers.
- Allows connection of up to 16 drives with multi-drop link system.
- Ensure noise-resistant interface.
Users can use any kind of RS232-485 converters. However a converter that has built-in ‘automatic RTS
control’ is highly recommended. Because the specifications of converters depend on the manufacturers,
please refer to the manual for detailed converter specifications.
5.1.3 Before Installation
Before installation and operation, this manual should be read thoroughly. If not, it can cause personal
injury or damage other equipment.
5.2 Specifications
5.2.1 Performance Specifications
Items Specifications
Communication method Modbus-RTU (RS485)
Transmission form Bus method Multi-drop Link System
Applicable inverter iG5 series drive
Number of drives Maximum 16 drives connectable*
Transmission distance Max. 1200m
* Consult with LS representative to connect more than 16 drives.
5.2.2 Hardware Specifications
Items Specifications
Installation S+, S-, CM terminals on control terminal strip
Power Supply Insulated from the inverter power supply
5.2.3 Communication Specifications
Items Specifications
Communication speed 19200/9600/4800/2400/1200 bps selectable
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