I2C Modbus RTU Slave Chip – IS4310

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

The available Function Codes are:

• 0x03 Read Holding Registers
• 0x06 Write Single Register
• 0x10 Write Multiple Registers

You can use the IS4310 in different ways:

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

Just access the Holding Register addresses you need over I2C — no libraries required.

The IS4310 offers a ready-to-use Modbus stack solution that helps reduce development time and speed up your time-to-market, while fully complying with strict T1.5 and T3.5 protocol timing requirements.

How it works?

The chip provides two interfaces:

• I2C interface for your microcontroller, FPGA, Arduino, Raspberry Pi, etc.
  ➜ This is where your system reads/writes Modbus data.
• 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: Modbus Slave ID, Baud Rate, Parity, Stop Bits.

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