1. Product Overview
Product Name: RS-232 (Isolated) to RS-485 Converter
Model: EX9520
Series: Autopro Industrial Communication Series
Article Number: EX9520
Manufacturer: Autopro

The Autopro EX9520 is a robust, industrial-grade communication converter designed to bridge RS-232 serial interfaces with RS-485 networks. It provides a reliable and isolated data link between legacy RS-232 devices and modern RS-485 communication systems, enabling long-distance, multi-drop serial communication in industrial automation, process control, and data acquisition environments. The EX9520 is engineered for high reliability, extended temperature operation, and ease of installation, making it suitable for both field and control room applications.

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2. Key Features
- RS-232 to RS-485 Conversion: Seamlessly converts RS-232 signals to RS-485 differential signals, allowing communication between devices using different serial standards.
- Galvanic Isolation: The RS-232 input is electrically isolated, protecting connected equipment from ground loops, surges, and electrical noise.
- Automatic Baud Rate Detection: The converter automatically detects and adjusts to the baud rate of the connected RS-232 device, simplifying setup and ensuring compatibility with a wide range of communication speeds.
- Auto Flow Control: Intelligent direction control automatically manages data transmission and reception on the RS-485 bus without requiring manual RTS signal handling.
- Extended Communication Range: Supports transmission distances up to 1200 meters (3937 feet) over RS-485 cabling.
- Network Expansion Capability: When used with the Autopro EX9510 RS-485 repeater, the communication range can be extended by an additional 1200 meters per segment.
- Multi-Drop Network Support: Enables control and communication with up to 256 devices on a single RS-485 network.
- Extended Temperature Operation: Designed for industrial environments with an operating temperature range of –25°C to +75°C.
- Flexible Power Options:
- Standard EX9520: 10 VDC to 30 VDC power input range.
- EX9520+: 9 VDC to 48 VDC extended power input range for broader compatibility with industrial power systems.
- Mounting Flexibility: Includes both DIN rail (cap-rail) and wall-mount options for versatile installation in control cabinets or field enclosures.
- RS-232 Bridge Functionality: Two EX9520 units can be paired to create an RS-232 bridge over an RS-485 link, extending RS-232 communication distance from a few meters to up to 1200 meters.
- Industrial-Grade Design: Rugged construction suitable for harsh environments, ensuring stable operation under vibration, temperature variation, and electrical interference.

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3. Technical Specifications
- Model: EX9520
- Interface Conversion: RS-232 (isolated) ↔ RS-485
- Communication Standard:
- RS-232: EIA/TIA-232 standard
- RS-485: EIA/TIA-485 standard, half-duplex, multi-drop
- Isolation: Galvanic isolation on RS-232 input
- Baud Rate: Automatic detection and adjustment (supports standard serial baud rates)
- Flow Control: Automatic direction control (no RTS/CTS required)
- Maximum Transmission Distance:
- RS-485: Up to 1200 m (3937 ft)
- Extendable with EX9510 repeater: +1200 m per segment
- Maximum Number of Nodes: 256 devices on RS-485 network
- Operating Temperature: –25°C to +75°C
- Power Supply:
- EX9520: 10–30 VDC
- EX9520+: 9–48 VDC
- Mounting Options: DIN rail (cap-rail) and wall mount (included upon request)
- Material: Industrial-grade metal or reinforced ABS housing (typical for Autopro converters)
- Protection: Electrical isolation, surge protection, and noise immunity
- Dimensions: Compact industrial form factor (specific dimensions not provided; typically suitable for DIN rail enclosures)
- Weight: Lightweight design for easy installation (exact weight not specified)

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4. Functionality
The EX9520 functions as a transparent protocol converter between RS-232 and RS-485 interfaces. It allows devices that communicate via RS-232—such as PLCs, sensors, controllers, or computers—to connect to an RS-485 network, which supports longer distances and multiple devices on a single bus.

Operational Principle:
- The RS-232 port receives serial data from a host device (e.g., PC or controller).
- The converter isolates and translates the RS-232 signal into RS-485 differential signals.
- The RS-485 interface transmits the data over twisted-pair cabling to one or more RS-485 devices.
- Auto flow control ensures that the converter automatically switches between transmit and receive modes as needed, eliminating manual control signals.
- The converter automatically detects the baud rate of the RS-232 device, ensuring seamless communication without manual configuration.

Use Cases and Applications:
- Industrial automation systems connecting legacy RS-232 equipment to modern RS-485 networks.
- Building management systems (BMS) and HVAC control networks.
- SCADA (Supervisory Control and Data Acquisition) systems for remote monitoring and control.
- Data acquisition systems requiring long-distance serial communication.
- RS-232 device extension over long distances using RS-485 cabling.
- Creating RS-232 bridges between two distant devices using two EX9520 units.
- Integration of serial devices in distributed control systems (DCS).

Compatibility:
- Compatible with standard RS-232 and RS-485 devices, including PLCs, HMIs, sensors, controllers, and industrial PCs.
- Works with Autopro’s RS-485 repeaters (e.g., EX9510) for network extension.
- Supports standard serial communication protocols such as Modbus RTU, ASCII, and other custom serial formats.

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5. Components & Accessories
Included Items:
- EX9520 RS-232 to RS-485 converter unit
- DIN rail (cap-rail) mounting bracket
- Wall-mount bracket (included upon request or specified in order)
- User documentation or quick start guide

Optional Accessories:
- EX9510 RS-485 Repeater: Extends communication range by an additional 1200 m per segment.
- Power Supply Units: Compatible DC power adapters (9–48 VDC depending on model).
- Cabling: Shielded twisted-pair RS-485 cables and standard RS-232 cables.
- Terminal Blocks or Connectors: For secure wiring and connection to field devices.

Connectors:
- RS-232 interface: Typically DB9 or terminal block connector (depending on configuration).
- RS-485 interface: Terminal block for differential pair (A/B lines).
- Power input: Terminal block for DC power connection.

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6. Installation & Setup
Requirements:
- DC power supply within the specified voltage range (10–30 VDC for EX9520, 9–48 VDC for EX9520+).
- Proper RS-485 cabling (twisted pair, shielded recommended).
- Adequate grounding and surge protection in industrial environments.

Mounting Options:
- DIN Rail Mounting: Snap the converter onto a standard 35 mm DIN rail using the included cap-rail bracket.
- Wall Mounting: Use the provided wall-mount bracket for fixed installations on panels or enclosures.

Configuration:
- No manual configuration required for baud rate or flow control; the converter automatically detects and adjusts communication parameters.
- Ensure correct wiring of RS-485 A/B lines and RS-232 TX/RX pins.
- For RS-232 bridge applications, connect two EX9520 units via RS-485 cabling and link each to an RS-232 device.

Setup Steps:
1. Mount the converter in the desired location (DIN rail or wall).
2. Connect the RS-232 device to the converter’s RS-232 port.
3. Wire the RS-485 network to the converter’s RS-485 terminals.
4. Connect the DC power supply.
5. Power on the system; the converter automatically initializes and begins operation.

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7. Performance & Capabilities
- Transmission Distance: Up to 1200 m per segment on RS-485; extendable with repeaters.
- Network Capacity: Supports up to 256 nodes on a single RS-485 bus.
- Data Rate: Automatically adapts to the baud rate of the connected RS-232 device (supports standard rates from 300 bps to 115.2 kbps or higher, depending on system configuration).
- Efficiency: Auto flow control minimizes latency and ensures efficient half-duplex communication.
- Reliability: Isolated RS-232 input prevents data corruption due to ground potential differences or electrical noise.
- Environmental Tolerance: Operates reliably in industrial temperature ranges (–25°C to +75°C).
- Limitations:
- RS-485 communication is half-duplex; simultaneous bidirectional transmission is not supported.
- Maximum cable length and node count depend on cable quality, termination, and network topology.
- Requires proper termination resistors at both ends of the RS-485 bus for optimal performance.

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8. Standards & Compliance
- Communication Standards:
- RS-232 compliant with EIA/TIA-232
- RS-485 compliant with EIA/TIA-485
- Electrical Isolation: Meets industrial isolation standards for serial communication interfaces.
- Environmental Compliance: Designed for industrial temperature and EMC environments.
- Safety and EMC: Conforms to general industrial safety and electromagnetic compatibility requirements (specific certifications may vary by region).
- RoHS Compliance: Manufactured in accordance with RoHS directives restricting hazardous substances.
- Quality Assurance: Produced under Autopro’s quality management system ensuring consistent performance and reliability.

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9. Additional Information
- Warranty: Typically covered by Autopro’s standard limited warranty (duration dependent on region and distributor).
- Technical Support: Autopro provides technical documentation, installation guides, and customer support for troubleshooting and integration assistance.
- Maintenance:
- Minimal maintenance required; periodic inspection of wiring and connectors recommended.
- Ensure proper ventilation and protection from excessive dust or moisture.
- Firmware/Updates: The EX9520 operates as a hardware-level converter and does not require firmware updates.
- Serviceability: Field-replaceable unit; can be easily swapped in case of failure without reconfiguration.
- Product Variants:
- EX9520: Standard model with 10–30 VDC power input.
- EX9520+: Enhanced model supporting 9–48 VDC input for broader power compatibility.
- Integration Notes:
- Ideal for retrofitting existing RS-232 devices into modern RS-485 networks.
- Compatible with Autopro’s full range of serial communication products, including repeaters, hubs, and converters.

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Summary
The Autopro EX9520 RS-232 (Isolated) to RS-485 Converter is a high-performance, industrial communication interface designed to bridge legacy RS-232 devices with modern RS-485 networks. Featuring galvanic isolation, automatic baud rate detection, and auto flow control, it simplifies integration and ensures reliable data transmission over long distances up to 1200 meters. Its rugged design, extended temperature range, and flexible mounting options make it ideal for demanding industrial environments. With support for up to 256 devices on a single RS-485 bus and optional range extension via the EX9510 repeater, the EX9520 delivers scalability, reliability, and ease of use for a wide range of automation and control applications.