Description
The IS4310-485M2 is a compact (44 × 24 mm) module with castellated holes, designed for PCB mounting to function as an RS485 Modbus RTU Slave. It features two key components: the Modbus Slave Stack (IS4310) and an RS485 transceiver.
The module features two RJ45 daisy-chain connectors and supports optional Bus Power daisy-chaining. This Bus Power is routed to the PWR pad, and it enables a design to be self-powered—provided that appropriate voltage regulation is implemented between the PWR pad and the +5V pad.
When using a powered bus, the maximum allowable daisy-chained current is 750mA. A resettable fuse protects the module from excessive currents. Additionally, when using a Powered Modbus Serial Line, ensure the maximum cable current rating is not exceeded.
The return path for the PWR pad is through the GND pads, which are connected to the Common signal of the Serial Line.
The Shield pin is daisy-chained and not connected to any pad. All cable shields should be connected to Common and Protective Ground at a single point for the entire bus, ideally at the master device. Ensure that you use shielded cables and connectors to maintain proper electrical continuity across all cable shields on the bus.
The module operates at a fixed voltage of 5V. The I2C pads (SDA and SCL) are open-drain and compatible with both 3.3V and 5V. The DNC pad must be left unconnected. The I2CSPD pin is used for I2C speed selection. The module includes multiple GND pads, and proper soldering of all pads is essential for mechanical stability and durability when attaching the module to the main PCB.
The module also features a green LED to indicate power status and a yellow LED to signal data transmission or reception. Each RJ45 connector includes the same two LEDs with identical functionality.
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