RS232 Modbus RTU Slave Module: IS4310-232M4

Description

The IS4310-232M4 is a Modbus RS232 module that integrates a Modbus RTU stack chip (IS4310), an RS232 transceiver and the classical DB9 (DE-9). The module connects to the master with a normal (not crossed) DB9 cable.

By integrating this module into your project, you instantly get a working Modbus RS232 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 RS232 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).