Overview
Description
The RTKA788152DE0000BU RS-485 evaluation board is used to evaluate the half-duplex transceivers of the RAA78815x family of RS-485 transceivers.
The RAA78815x family includes half and full-duplex transceivers with active-high driver-enable pins and active-low receiver-enable pins. These transceivers support data rates of 115kbps, 1Mbps and 20Mbps with a performance that is characterized from -40°C to +85°C.
Features
- Single 115kbps half-duplex transceiver
- RAA788152 (115kbps version currently installed) can be unsoldered and replaced by RAA788155 (1Mbps version) or RAA788158 (20Mbps version)
- Placeholders for fail-safe biasing resistors
- Configuration jumpers to operate the transceiver as transmitter or receiver, or as a transmitter with loopback
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Manual - Development Tools | PDF 1.08 MB | |
| Application Note |
PDF
1.55 MB
日本語
AI-generated Summary:
Modbus communication over UART is implemented using the RL78 microcontroller and Renesas RS-485 transceiver, supporting both Modbus ASCII and RTU modes. The system uses GPIO to control send/receive permissions and TAU0 timers to measure intervals between characters and frames, ensuring proper timing in communication. The network operates in a single-master/multi-slave configuration with up to 247 slaves, each having a unique address. The document details hardware configurations, UART communication settings, supported function codes, and interrupt handling for both master and slave modes. It also includes software structure, constants, variables, and instructions for running the system in various environments. PCB design files typically bundled include BOM, schematic, and Gerber files.
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| Application Note |
PDF
1.46 MB
日本語
AI-generated Summary:
Modbus communication operates using a single-master/multi-slave architecture over serial interfaces, primarily Modbus ASCII and Modbus RTU modes. Modbus ASCII sends data as ASCII characters, making parsing easier but increasing transmission time, while Modbus RTU transmits binary data, reducing transmission time but requiring precise timing for parsing. The protocol supports up to 247 slaves, each with a unique address, and commonly uses RS-485 physical layers. The RL78 microcontroller combined with Renesas RS-485 transceivers enables efficient Modbus communication for industrial automation, supporting low-power operation and I/O control. The document details hardware and software configurations, including UART settings, timing measurements, and interrupt handling for both master and slave modes in ASCII and RTU formats.
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| Application Note |
PDF
1.64 MB
日本語
AI-generated Summary:
Modbus communication protocol supports data transfer between industrial devices using serial communication modes: Modbus ASCII and Modbus RTU. Modbus operates on a single-master/multi-slave network with up to 247 slaves, each having a unique address. Modbus ASCII transmits data as ASCII characters, increasing data size and transmission time, while Modbus RTU uses binary format for faster communication but requires timing for parsing. The protocol often uses RS-485 physical layer. Combining RL78 microcontrollers with Renesas RS-485 transceivers enables efficient Modbus communication for low-power and I/O control applications. The document details hardware and software configurations, including UART settings, timing intervals, and function codes, to implement Modbus ASCII/RTU communication.
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| PCB Design Files | ZIP 371 KB | |
5 items
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Design & Development
Sample Code
Sample Code
Filters
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| Type | Title | Date Date |
| Sample Code | RL78/G14 Modbus ASCII/RTU Application Note Rev.2.00
[Toolchains=CC-RL|V1.12.01]
ZIP
3.04 MB
日本語
Application:
Industrial
Compiler:
CC-RL
Function:
Communication Interface
IDE:
e2 studio
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| Sample Code | RL78/G16 Modbus ASCII/RTU Application Note Rev.1.10
[Toolchains=CC-RL|V1.12.01]
ZIP
5.70 MB
日本語
Application:
Industrial
Compiler:
CC-RL
Function:
Communication Interface
IDE:
e2 studio
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| Sample Code | RL78/G22 Modbus ASCII/RTU Application Note Rev.1.10
[Toolchains=CC-RL|V1.12.01]
ZIP
5.89 MB
日本語
Application:
Industrial
Compiler:
CC-RL
Function:
Communication Interface
IDE:
e2 studio
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3 items
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Product Options
| Part Number | Status | Stock | Sampleable | Pb (Lead) Free |
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| RTKA788152DE0000BU | Active | In Stock | Available | Yes |
Videos & Training
Overview of the key features, advantages and target applications for the RAA78817x family of 3.3V RS-485/422 transceivers with +/-3kV EFT immunity and the RAA78815x family of 5V RS-485/422 transceivers with +/-5KV EFT immunity.
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