ST485ABN

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The RS485 protocol is the perfect solution for the establishment of a mutual communication link between multiple devices, for example for the communication between a computer and a PLC. Among them, the interface IC ST485ABN is a device designed for this purpose. In this article we will learn about the application fields of ST485ABN and its working principle.

ST485ABN, manufactured by STMicroelectronics, is a half-duplex transceiver IC based on the RS485 standard protocol. It is used to provide a full-duplex or half-duplex communication link between different devices. It provides a hardware interface between electronic controllers such as PLCs, CNCs, and workstations, and other electronic systems.

The device is available in two packages—the 8-pin SOIC-8, and the 8-pin PDIP. It is a low power device and has a data rate of 2 to 10 Mbps. It is also very robust and is immune to EMI and ESD, making it ideal for industrial applications. The device is also capable of detecting and rejecting noise on the bus. It integrates a voltage regulator that allows its operation at supply voltages of +5V, from +10V to +14V.

ST485ABN can be used in various industrial applications such as factory/building automation, process control, security systems, medical control, automotive, avionic and marine systems, and other communication applications. In addition, the integrated DC-DC converter can be used to power peripherals with a regulated voltage of +5V.

The ST485ABN transceiver works according to the principle of the differential signal. This principle uses the concept of sending signals through two wires, with opposite polarities. In the case of this device, the positive and negative signal lines are transmitted on a single pair of wires using the differential voltage line driver. The transceiver receives and sends data at the same time, which ensures that any errors or noise in the signal can be eliminated through differential detection.

The ST485ABN is an ideal device for applications requiring reliable and high speed communication. Its wide range of features and robust design make it a great choice for various industrial applications. In addition, its power consumption is very low, which makes it suitable for low power applications.

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