RS422/RS485 isolator Industry

RS422/RS485 Isolator Industry by Wiesemann & Theis

The RS422/RS485 Isolator Industry (#66201) by Wiesemann & Theis offers a reliable solution for galvanic isolation of RS422 devices and RS485 bus systems to protect devices from equalizing currents and electromagnetic interference. With an isolation voltage of 1 kV DC, the isolator is ideal for applications in Industry 4.0, automation, and control technology, especially in control cabinets. The two RS422/RS485 interfaces (9-pin Sub-D plugs) support high transmission speeds up to 3 MBaud and allow flexible device connection. The automatic control in RS485 mode and transparent operation without adjusting transmission parameters significantly simplify installation. The DIN rail housing and external power supply (12–24 V AC/DC) via a galvanically isolated, pluggable screw terminal make the isolator optimal for industrial environments. The isolator complies with strict standards for office and industrial environments and offers a five-year warranty. This article highlights the technical features, applications, and benefits of the RS422/RS485 Isolator Industry.

Galvanic Isolation: Protection Against Equalizing Currents

The RS422/RS485 Isolator Industry galvanically isolates RS422 and RS485 connections between two devices or bus systems to prevent equalizing currents that can destabilize control loops or damage devices. In many industrial applications, control loops operate with potential-free conditions to ensure precise control. However, if a control bus or PC is grounded, equalizing currents may arise that affect control loop stability. The isolator provides an isolation voltage of 1 kV DC, ensuring robust separation between ports and extending the lifetime of connected devices. This is especially important in scenarios where RS422 or RS485 interfaces are used over long distances, such as in production facilities or building automation systems. For example, an RS485 bus connecting sensors and controllers in a factory can be protected by the isolator against interference from electrical devices or distant lightning strikes. The automatic control in RS485 mode ensures reliable communication without manual configuration, simplifying handling.

Interfaces and Connectivity

The RS422/RS485 Isolator Industry features two RS422/RS485 interfaces, each realized via a 9-pin Sub-D plug. These interfaces support both RS422 and RS485 communication and offer high data rates up to 3 MBaud, making them ideal for data-intensive automation applications. The galvanic isolation between the ports with an isolation voltage of 1 kV DC protects both sides from electrical interference and ensures secure data transmission. The isolator operates transparently, without requiring settings of transmission parameters (such as baud rate or parity), facilitating integration into existing systems. In RS485 mode, control is automatic, optimizing communication in bus systems with multiple devices. The DIN rail housing allows for easy mounting in industrial control cabinets, making the isolator especially suitable for Industry 4.0 applications. The high transmission speed and robust design ensure reliable communication even in environments with long cable runs or electromagnetic interference.

Power Supply and Energy Efficiency

The RS422/RS485 Isolator Industry is powered via an external power supply of 12 V to 24 V AC/DC connected via a pluggable screw terminal. The power input is galvanically isolated, providing additional protection against equalizing currents and enhancing the safety of the entire installation. This flexible power supply is particularly advantageous in industrial environments where different power sources may be available. The isolator’s energy-efficient design minimizes power consumption and makes the device environmentally friendly. For applications requiring surge protection, Wiesemann & Theis recommends the isolator 66203, which offers additional protection features. The galvanically isolated power supply and robust construction of the isolator ensure reliable operation even in demanding scenarios such as production halls or data centers.

Please note: The power supply is NOT included in the delivery.

Compliance and Reliability

The RS422/RS485 Isolator Industry complies with stringent standards for immunity (EN 61000-6-2) and emissions (EN 55032:2015 + A1 Class B, EN 61000-3-2, EN 61000-3-3), qualifying it for use in residential, commercial, and industrial environments. Its high immunity ensures reliable operation even in environments with electromagnetic interference, such as production facilities or control centers. CE marking and UL certification confirm suitability for international applications, while the robust design is intended for continuous operation. With a five-year warranty, the isolator provides a low-maintenance and durable solution for professional users. The galvanic isolation and high transmission speed offer additional safety and stability, especially in applications with long cable lengths or complex bus systems.

Versatile Applications

The RS422/RS485 Isolator Industry is ideal for applications where galvanic isolation is required to ensure the reliability and safety of RS422 and RS485 connections. In automation technology, the isolator protects controllers, sensors, or actuators from equalizing currents caused by long cables or electrical loads. For example, an RS485 bus connecting multiple sensors in a production plant can be protected by the isolator to ensure precise control. In Industry 4.0, the isolator enables secure device connection to control buses, which is critical for networked production processes. In data acquisition, the galvanic isolation ensures precise data by eliminating equalizing currents, such as when connecting RS485 sensors for environmental parameters like temperature or pressure. The DIN rail mounting makes the isolator particularly suitable for industrial control cabinets, while support for high transmission speeds (up to 3 MBaud) and automatic control in RS485 mode ensure compatibility with modern bus systems. The isolator is versatile, suitable from manufacturing plants to building automation systems.

Advantages of Transparent Operation and DIN Rail Mounting

The transparent operation of the RS422/RS485 Isolator is a key advantage, as no adjustment of transmission parameters is required. This reduces configuration effort and makes the isolator compatible with a wide range of RS422 and RS485 devices, regardless of baud rate or protocol settings. The automatic control in RS485 mode optimizes communication in bus systems with multiple devices, simplifying handling in complex networks. The DIN rail housing allows for easy and stable mounting in industrial control cabinets where space and order are crucial. The high transmission speed of up to 3 MBaud and robust construction ensure reliable communication even in environments with electrical interference. This combination of user-friendliness and robust design is especially beneficial in environments requiring fast and reliable solutions, such as industry or automation technology.

Reliable and User-Friendly Solution for RS422/RS485 Isolation

The RS422/RS485 Isolator Industry by Wiesemann & Theis impresses with its simplicity, high reliability, and standards compliance. With galvanic isolation, support for high transmission speeds, automatic control in RS485 mode, DIN rail mounting, and external power supply, it is the ideal solution for applications in automation technology, Industry 4.0, and data acquisition. The five-year warranty underlines the durability and quality of this compact solution.