Renesas Electronics Modbus ASCII/RTU Slave Board
Renesas Electronics Modbus ASCII/RTU Slave Board is a reference design that combines Renesas products together to deliver a comprehensive solution. Modbus is widely used in the fields of factory automation and plant automation because its specifications are open to the public, free to use, and relatively easy to implement. Therefore, Modbus is a very common serial communication protocol for connecting industrial equipment.
Modbus is based on serial communication and features two transmission modes, Modbus ASCII and Modbus RTU. The physical layer of Modbus often uses the RS-485 standard. By combining the RL78 Microcontroller (MCU) with sample programs and RS-485 transceiver products, you can easily implement slave devices that communicate using Modbus ASCII or Modbus RTU. The RL78 MCU has industry-leading low power operation, making it ideal for simple functions such as low power operation, I/O control, temperature, and humidity measurement.
System Benefits
- Modbus ASCII/RTU enables 1:N connection and communication with a maximum transmission distance of 500m by using RS-485 for the physical layer
- Modbus can manage the environment in a factory by acquiring the illuminance, air quality, temperature, and humidity information to control the equipment and air vents
System Block Diagram
Documents
Microcontroller
Renesas Electronics RL78/G14 Series MCUs
High function general-purpose MCUs suitable for motor control and industrial/metering applications.
LDO
Renesas Electronics ISL9005A Low Dropout Linear Regulators
Offers high performance and are capable of sourcing 300mA of current.
Transceiver
Renesas Electronics ISL32704E Isolated RS-485 Transceivers
Designed for 4Mbps bidirectional data transmission for Industrial Internet of Things networks.
Additional Application Solutions
See how Renesas' complementary product portfolios of Analog + Power + Embedded Processing work together to deliver comprehensive solutions.