Description

The IS4310-485M2 is a Modbus RS485 module that integrates a Modbus RTU stack chip (IS4310), an RS485 transceiver and two daisy-chained RJ45 connectors.

By integrating this module into your project, you instantly get a working Modbus RS485 interface — just read from or write to the IS4310's I2C memory registers, which directly map to the Modbus Holding Registers.

This solution minimizes the design effort required to integrate a Modbus RTU Slave with an RS485 physical layer.

Optionally, you can integrate the IS4310 chip in your own design to minimize costs and customize the connector. Example schematics can be found in the IS4310 datasheet.

The IS4310 is a chip that integrates a Modbus RTU Slave stack. It features an internal memory of 500 Holding Registers, accessible by both a microcontroller (via I2C) and a Modbus Master device (e.g., PLC, computer, etc.).

You can use the IS4310 in three modes:

• As a Sensor → your microcontroller writes data to the chip via I2C.
• As an Actuator → your microcontroller reads data from the chip via I2C.
• Mixed → your microcontroller reads and writes data to the chip via I2C.

Just read/write the registers you need — no protocol stack required.

The goal of the IS4310 is to eliminate the engineering effort typically required to implement and validate Modbus RTU communication. It offers a reliable, ready-to-use solution that helps reduce development time and speed up your time-to-market (TTM).

This company and the products provided herein are developed independently and are not affiliated with, endorsed by, or associated with any official protocol or standardization entity. All trademarks, names, and references to specific protocols remain the property of their respective owners.

Download Documentation

This Module (IS4310-485M2)

• 📄 Datasheet: Available at www.inacks.com/is4310-485m2
• 📘 Online Wiki: https://inacks.gitbook.io/is4310-485m2-wiki/
• 🧩 Module Schematic: https://github.com/inacks/IS4310-485M2-Module-Schematic-Design-ISXMPL4310ex3

Modbus Chip (IS4310) used in this module

• 📄 Datasheet: Available at www.inacks.com/is4310
• 📘 Online Wiki: https://inacks.gitbook.io/is4310-wiki
• 📎 Product Flyer: https://github.com/inacks/IS4310-Flyer

Firmware Example Projects

• Modbus Sensor with Arduino
  👉 IS4310-Modbus-Arduino-Sensor-Example1035

• Modbus Actuator with Arduino
  👉 IS4310-Modbus-Arduino-Actuator-Example1036

Hardware Design Example Projects

• Modbus RS485 Schematic
  👉 IS4310-RS485-Schematic-Design-Exemple-ISXMPL4310ex1

How it Works?

The chip provides two interfaces:

• An I2C interface for your microcontroller, FPGA, Arduino, Raspberry Pi, etc.
  ➜ This is where your system reads/writes Modbus data.

• A UART output to connect your preferred RS485 (or RS232, RS422) transceiver.
  ➜ This is the fieldbus that connects to a PLC, computer, or machine.

The internal memory is composed of 504 registers: - 500 Holding Registers for user data. - 4 Configuration Registers for communication settings.

Default Chip Settings

Default Modbus Settings:

• Modbus Slave ID: 1

• Modbus Baud Rate: 19200 bps

• Modbus Parity: Even

• Modbus Stop Bits: 1

Default I2C Settings:

• I2C Slave Address: 0x11 (fixed)

• I2C Speed: 100 kHz (when pin 7 is tied to GND)

Others

Download Software

• qModMaster: Modbus RTU Master Software
  🔗 Download qModMaster

Need an Evaluation Board?

The Kappa4310Ard is an Arduino-form-factor evaluation board that lets you prototype and play with the Modbus chip IS4310 over RS485.

You can get it also on Tindie: https://www.tindie.com/products/inacks/evaluation-board-for-is4310/

For more information about the Evaluation Board you can also check: www.inacks.com

Pick'n'Place

📦 Reels available for high-volume orders. Contact us.

Questions?

💬 Contact us anytime for support.

www.inacks.com