RL78 microcontrollers for simple communication functions, such as low power consumption operation and measurement of temperature and humidity

RL78 microcontrollers for simple communication functions, such as low power consumption operation and measurement of temperature and humidity

Overview

Seamless real-time communication is a core prerequisite for all Industry 4.0/IIoT (Industry Internet of Things) implementations, and is necessary in order to support serial communication to end devices such as sensors. The RL78 microcontrollers deliver the highest level of low power consumption in the industry and are ideal for end devices with simple functions such as I/O control and temperature and humidity measurement. For the RL78 microcontrollers, Renesas Electronics offers Modbus ASCII/RTU and IO-Link solutions that are expected to be widely used in such end devices.

Overview

Modbus ASCII/RTU

Modbus is widely used in the field of factory automation and plant automation because the specifications are open to the public, free to use, and relatively easy to implement. As a result, it is the most popular serial communication protocol for connecting industrial equipment.

The RS-485 standard is often used in the physical layer of Modbus ASCII/RTU; it is easy to create slave devices that communicate with Modbus ASCII/RTU by connecting an RL78 microcontroller and a Renesas RS-485 transceiver using UART. The RL78 microcontrollers are particularly suitable for simple functions such as low power consumption operation and I/O control, temperature and humidity measurement. Applications like the following are available. Renesas provides application notes and sample software.

You can select an RL78 microcontroller tailored to the application.

   - For I/O controls and I2C interface sensors:RL78/G13, RL78/G14

   - For analog sensors:RL78/G1A, RL78/H1D

   - For motor units:RL78/G14, RL78/G1F

   - For LCD units:RL78/L12, RL78/L13, RL78/L1A, RL78/L1C

Evaluation Boards

Product Name Orderable Part Number Buy
RL78/G14 Fast Prototyping Board RTK5RLG140C00000BJ Buy
Low-Cost Isolated RS-485 Transceiver Evaluation Board ISL32704EVAL1Z Buy

 

Application Note

RL78/G14 Modbus ASCII/RTU Application Note (R01AN5380) Download

 

RL78/G14 Fast Prototyping Board