ST485EXDR Integrated Circuits (ICs)

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RS-485 is a multi-drop serial communications protocol that uses differential signaling over twisted pair. This differs from traditional unbalanced signaling such as RS-232, and enables data rates up to 12 Mbps. Typically, RS-485 is used to allow multiple nodes to communicate over a single, multi-point communications channel. Depending on the application, multiple nodes can be configured as point-to-point, multi-drop, or star networks.

Introduction

The ST485EXDR is a low-cost RS-485 Transceiver with integrated bi-directional logic for selecting the direction of data flow. The RS-485 standard is a general-purpose, differential signaling protocol that defines driver and receiver characteristics suitable for several hundred nodes or more in a single communication line. The ST485 is based on the EIA/TIA-485-A standard. This standard defines three for RS-485 protocols, namely, (1) Multi-Point, (2) Point-To-Point, and (3) Star. The ST485 is compatible with the multi-point and point-to-point protocol.

Applications

The ST485EXDR is designed to meet European EMC requirements making it ideally suited for a wide range of industrial automation and control applications. It is particularly suitable for interfacing a controller with multiple slaves, providing measurements and/or control over a distance of up to 1200 meters. Typical applications include:

• Industrial Process Control
• Drives & Motors
• Home Automation
• Building Automation
• Transportation
• Security & Alarms
• Lighting & Irrigation Control

Working Principle

The ST485EXDR operates by echoing the data it receives on its TxD (transmit) line. The direction control logic embedded in the device polls each node on the line, sequentially testing for the line drivers output state. If the drivers output state is enabled, the drivers line is driven. If enabled, the drivers line is then monitored for TxD activity, and if activity is detected, the drivers line is driven. The drivers line is then monitored for TxD activity, and if activity is detected, the drivers line is driven, the drivers transmit direction is changed, and the data received is echoed on the axis of the line either in communication or control mode.

Conclusion

The ST485EXDR is a low-cost RS-485 Transceiver with integrated bi-directional logic for selecting the direction of data flow. It is ideal for industrial automation and control applications and is capable of communicating over a distance of up to 1200 meters. It supports both the Multi-Point and Point-To-Point protocols and operates by echoing the data it receives on its TxD (transmit) line. This enables data rates up to 12 Mbps, making it a reliable and efficient choice for those requiring multi-point communications over twisted pair.

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