The Advantech ADAM-4520 is a rugged, industrial-grade isolated converter designed to transparently convert standard RS-232 signals into long-distance RS-422 or multi-drop RS-485 signals. Whether you are extending communication distances or protecting sensitive equipment from electrical hazards, the ADAM-4520 provides a seamless, plug-and-play solution for upgrading legacy systems .

Key Features & Technical Specifications

3000 VDC Isolation & Surge Protection

• Galvanic Isolation: Provides 3000 VDC isolation protection between the RS-232 side and the RS-422/485 side. This breaks ground loops and protects your central PC/PLC from voltage spikes and electrical noise found in factory floors or external field sites .

• Surge Protection: On-board RS-485 data line surge protection ensures reliability in unstable power environments .

Long Distance & High Speed Networking

• Extend up to 1.2 km (4,000 ft): Overcomes the standard 15-meter limitation of RS-232, allowing communication over 1.2 kilometers .

• High Speed: Supports data rates up to 115.2 kbps, ensuring fast data throughput for SCADA, PLCs, and data acquisition modules .

• Multi-drop Support: Allows networking of up to 32 devices on a standard RS-485 network .

Flexible & Smart Design

• Automatic Data Flow Control: Features automatic RS-485 data flow control, meaning no manual handshaking wires are required for half-duplex operation .

• DIP Switch Selectable: Easily toggle between 2-wire RS-485 or 4-wire RS-422 modes .

• Termination Resistors: Includes built-in 120Ω termination resistors (and space for custom values) to reduce signal reflections on long cables .

• LED Indicators: Power and Data flow indicators (Tx/Rx) provide easy status monitoring and troubleshooting .

Wide Power & Temperature Range

• Universal Power Input: Accepts a wide range of DC power inputs from +10V to +48V (ADAM-4520A), making it compatible with industrial control panels .

• Extended Temperature: Operates reliably from -10°C to 70°C (Standard) or -40°C to 85°C (ADAM-4520A / Wide Temp models) .

Technical Specifications Overview

Applications & Use Cases

The ADAM-4520 is essential for system integrators and automation engineers needing to modernize communication. Use it for:

• SCADA Systems: Connecting long-distance RTUs and PLCs to central servers (e.g., water reservoir monitoring, oil & gas) .

• Building Automation: Converting PC RS-232 ports to RS-485 for HVAC or lighting control networks.

• Data Acquisition (DAQ): Interfacing remote data acquisition modules with standard PC hardware.

• Radio Modems: Bridging serial devices to radio transceivers for telemetry

OUR POLICY

• Trademark/Brand Disclaimer: All product names, trademarks, brands, and logos mentioned in this listing are the property of their respective owners. They are used strictly for identification purposes only. We are an independent reseller of surplus and pre-owned industrial equipment and are not an authorized distributor, dealer, or affiliate of the manufacturer unless explicitly stated.
• All items are sold / shipped / delivered as it is showing in the product photos 

• Conditioned Item condition is determined solely based on the available information at the time of sale. These items are sourced from surplus stock, ship recycling, or industrial decommissioning, and unless explicitly stated in the item description, batteries or cells are not included due to international shipping regulations. Manufacturer labels, packaging, or markings may vary from those shown or expected. Buyers are strongly encouraged to review all details carefully before making a purchase.

• Estimated delivery time: 7-10 working days from India (may be delayed due to customs or changes in international shipment policy).
• Buyer responsible for paying any customs clearance or import duties, VAT & other applicable fees by eBay / Authorities. Please check with your country's customs office to determine what these additional costs will be prior to buying.

• Orders dispatched within 48 Hours / 2 working day and Freight Heavy Weight items 3 working days after payment confirmation. Worldwide shipping through DHL, FedEx, UPS Fast Delivery Service on DAP basis.
• Return Policy: We offer a 14-day return policy for most items. If you would like to return an item, please contact us through eBay messages for instructions.
• Refunds: Refunds will be issued once the item has been received and inspected. If the item is not in its original condition, we may refuse the return or deduct a restocking fee.

• Communication: If you have any concerns or questions about your order, please contact us through eBay messages before leaving negative / neutral feedback. We are here to help and will do our best to resolve any issues.
• Resolution: If there is an issue with your order, we will work with you to resolve it in a timely and satisfactory manner. This may include offering a replacement or refund.

Working Time 

• Monday To Saturday
• 10:00 AM to 7:00 PM (IST)