1. Product Overview

Product Name: UCON301-I
Model: UCON301-I
Series: Universal Serial Interface Converter Series
Article Number: UCON301-I
Manufacturer: Rayon Technology Co., Ltd.
Product Type: RS232/RS422/RS485 to Ground-Isolated RS422/RS485 Converter

The UCON301-I is a high-performance, intelligent serial interface converter designed and manufactured by Rayon Technology Co., Ltd. It provides a universal solution for converting between RS232, RS422, and RS485 communication standards while offering galvanic ground isolation on the output side. The device is engineered for industrial and automation environments where reliable, noise-immune, and flexible serial communication is required.

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2. Key Features

- Universal Input Interface: Supports one configurable RS232, RS422, or RS485 input port.
- Ground-Isolated Output: Provides one ground-isolated RS422 or RS485 output port, ensuring electrical isolation between connected devices.
- Multiple Conversion Modes:
- RS232 → Isolated RS422/RS485 Converter
- RS422 → Isolated RS422 Repeater
- RS485 → Isolated RS485 Bridge
- RS422 → Isolated RS485 Converter
- Auto Data Direction Control (ADDC): Automatically manages data transmission direction in RS485 mode, eliminating the need for manual control signals.
- LED Indicators: Dedicated LEDs for power and data transmission/reception on both ports for easy status monitoring.
- Flexible Configuration: DIP switch settings allow users to select interface modes for both ports.
- Compact and Durable Design: Housed in a robust enclosure suitable for industrial environments.
- Power Efficiency: Operates on 5V DC with a typical current consumption of 300mA.
- Wide Environmental Tolerance: Designed for operation in temperatures from 0°C to 55°C and humidity up to 95% RH.
- Compatibility: Works seamlessly with RS232, RS422, and RS485 devices, including PLCs, sensors, controllers, and industrial PCs.

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3. Technical Specifications

Physical Characteristics:
- Dimensions: 92 mm (W) × 118 mm (L) × 27 mm (H)
- Weight: Not specified (lightweight aluminum or composite housing typical for this class)
- Material: Industrial-grade enclosure (Rayon standard housing)

Electrical Characteristics:
- Power Supply: 5V DC (via UP110/UP220 power adapter)
- Current Consumption: Typical 300mA
- Isolation: Full ground isolation between Serial Port 1 and Serial Port 2

Environmental Conditions:
- Operating Temperature: 0°C to 55°C
- Storage Temperature: 0°C to 65°C
- Operating Humidity: 0% to 95% RH (non-condensing)
- Storage Humidity: 5% to 95% RH

Connectors:
- Serial Port 1: DB9 male connector (configurable as RS232/RS422/RS485)
- Serial Port 2: DB9 male connector (ground-isolated RS422/RS485)
- Signal Pins: TX+, TX−, RX+, RX−, and isolated GND
- Optional Adapter: TB485 module (DB9 to 3-pin terminal block)

Indicators:
- PWR LED: Power ON indicator
- Serial1 TXD/RXD LEDs: Data transmission/reception activity for input port
- Serial2 TXD/RXD LEDs: Data transmission/reception activity for isolated output port

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4. Functionality

The UCON301-I functions as a universal serial interface converter with built-in ground isolation. It allows communication between devices using different serial standards while preventing ground loops and electrical interference.

Operating Principle:
- Serial Port 1 can be configured as RS232, RS422, or RS485 via DIP switches.
- Serial Port 2 can be configured as RS422 or RS485 and is galvanically isolated from Port 1 and the power supply ground.
- The converter uses internal circuitry to translate signal levels and manage data direction automatically in RS485 mode.

Typical Use Cases:
1. RS232 to Isolated RS422/RS485 Converter: Connects legacy RS232 devices to modern RS422/RS485 networks.
2. RS422 to Isolated RS422 Repeater: Extends communication distance and isolates network segments.
3. RS485 to Isolated RS485 Bridge: Expands RS485 network range and isolates segments to prevent interference.
4. RS422 to Isolated RS485 Converter: Enables cross-standard communication between RS422 and RS485 devices.

Applications:
- Industrial automation and control systems
- Building management systems (BMS)
- SCADA and telemetry networks
- Data acquisition systems
- Serial communication between PLCs, HMIs, and sensors
- Long-distance serial communication requiring isolation

Compatibility:
- Compatible with standard RS232, RS422, and RS485 devices.
- Supports both full-duplex (RS422) and half-duplex (RS485) communication modes.
- Works with Rayon’s TB485 terminal block adapter and other Rayon interface products such as TWIN485 and ULOG301-I.

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5. Components & Accessories

Included Components:
- UCON301-I Converter Unit
- 5V DC Power Adapter (UP110 or UP220)
- User Manual

Optional Accessories:
- TB485 Kit: DB9 Female to RS485 terminal block adapter for easy wiring.
- TWIN485 Box: Dual-channel isolated RS232 to RS422/RS485 converter for multi-port applications.
- ULOG301-I Box: Advanced version with USB monitoring capability for real-time data analysis.

Connectors and Interfaces:
- Two DB9 male connectors (Serial1 and Serial2)
- Power input jack for 5V DC adapter
- DIP switch block for interface configuration

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6. Installation & Setup

Power Requirements:
- External 5V DC power supply (UP110/UP220 adapter recommended).
- Ensure stable power source with at least 300mA current capacity.

Mounting Options:
- Desktop or panel installation (compact form factor allows flexible placement).
- Can be integrated into control cabinets or communication panels.

Configuration Procedure:
1. Set Interface Type via DIP Switches:
- Serial Port 1: Select RS232, RS422, or RS485.
- Serial Port 2: Select RS422 or RS485.
2. Connect Power Adapter: Plug in the 5V DC adapter to the power input.
3. Connect Serial Devices:
- Use DB9 connectors or optional TB485 terminal block for wiring.
- Ensure correct pin assignments for TX+, TX−, RX+, RX−, and GND.
4. Verify LED Indicators:
- PWR LED should illuminate when powered.
- TXD/RXD LEDs should blink during data transmission.

Example Configurations:
- RS232 → RS485 Converter:
- Port 1: RS232 (DIP 1,2 = OFF)
- Port 2: RS485 (DIP 3 = OFF, 4 = ON)
- RS422 → RS422 Repeater:
- Port 1: RS422 (DIP 1,2 = ON)
- Port 2: RS422 (DIP 3,4 = ON)
- RS485 → RS485 Bridge:
- Port 1: RS485 (DIP 1 = OFF, 2 = ON)
- Port 2: RS485 (DIP 3 = OFF, 4 = ON)

Setup Notes:
- Serial Port 1 shares ground with the power adapter.
- Serial Port 2 is fully isolated from power and Port 1 ground.
- Use ADDC (Auto Data Direction Control) for RS485 mode to automate TX/RX switching.

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7. Performance & Capabilities

Data Transmission:
- Supports full-duplex (RS422) and half-duplex (RS485) communication.
- ADDC automatically manages data direction in RS485 mode, ensuring seamless communication without software control.

Isolation Performance:
- Complete galvanic isolation between input and output ports prevents ground loops and protects connected equipment from voltage surges or noise interference.

Speed and Range:
- Typical RS422/RS485 communication speeds up to 115.2 kbps (depending on cable quality and environment).
- RS422 communication distance up to 1200 meters (4000 feet) under standard conditions.
- RS485 network extension possible through bridge/repeater configuration.

Efficiency and Reliability:
- Low power consumption (300mA typical).
- LED indicators provide real-time status feedback for diagnostics.
- Stable operation across wide temperature and humidity ranges.

Limitations:
- Requires external 5V DC power supply.
- Not designed for outdoor or high-voltage environments without additional protection.
- DIP switch configuration must be set manually before operation.

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8. Standards & Compliance

Electrical and Communication Standards:
- Complies with EIA/TIA RS232, RS422, and RS485 serial communication standards.
- Supports both balanced differential signaling (RS422/RS485) and unbalanced signaling (RS232).

Safety and Isolation:
- Designed with galvanic isolation between ports to meet industrial safety requirements.
- Prevents ground potential differences and electrical interference.

Environmental Compliance:
- Manufactured in accordance with RoHS directives (lead-free and environmentally safe components).
- Meets industrial-grade operating temperature and humidity specifications.

Quality Assurance:
- Produced under Rayon Technology’s ISO-certified manufacturing processes.
- Each unit undergoes functional testing for signal integrity and isolation performance.

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9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year; contact Rayon Technology for details).

Technical Support:
- Direct technical assistance available from Rayon Technology’s engineering team.
- Support contact:
- Email: info@rayontech.com.tw / rayon@ms1.hinet.net
- Phone: +886-2-82858362
- Fax: +886-2-82857065
- Website: [www.rayontech.com.tw](http://www.rayontech.com.tw) / [www.rayontech.com](http://www.rayontech.com)

Maintenance:
- No routine maintenance required.
- Periodic inspection of connectors and cables recommended.
- Ensure proper ventilation and avoid exposure to moisture or dust.

Firmware and Updates:
- Hardware-based converter; no firmware updates required.
- Configuration handled entirely via DIP switches.

Related Products:
- TWIN485: Dual-channel isolated RS232 to RS422/RS485 converter.
- ULOG301-I: USB-monitored version of UCON301-I for real-time data analysis and troubleshooting.

Manufacturer Address:
Rayon Technology Co., Ltd.
2F, No. 177, Chung Shan 2 Rd., Lu Chou City, Taipei Hsien, Taiwan

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Summary

The Rayon UCON301-I is a versatile, industrial-grade serial interface converter that bridges RS232, RS422, and RS485 communication standards with full ground isolation. Its flexible configuration, automatic data direction control, and robust design make it ideal for complex serial communication networks in industrial automation, control systems, and data acquisition environments. With its compact size, LED diagnostics, and reliable isolation, the UCON301-I ensures safe, interference-free, and efficient data transmission across diverse serial communication infrastructures.