Comprehensive Product Summary – UTS031 USB 2.0 to Isolated 3×RS232 + 1×RS485/422 Converter

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### 1. Product Overview

Product Name: USB 2.0 to Isolated 3×RS232 + 1×RS485/422 Converter
Model: UTS031
Series: UTS400 Series – USB to Serial Port Converter
Article Number: UTS031
Manufacturer: Rayon Technology Co., Ltd.
Manufacturer Address: 2F, No. 177, Chung Shan 2 Rd., Lu Chou City, Taipei Hsien, Taiwan
Contact:
- Tel: +886-2-82858362
- Fax: +886-2-82857065
- Email: rayon@ms1.hinet.net
- Web: [www.rayontech.com](http://www.rayontech.com) / [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)

Product Description:
The Rayon UTS031 is a high-performance USB 2.0 to multi-serial converter designed to provide isolated communication interfaces for industrial, laboratory, and commercial applications. It integrates three isolated RS232 ports and one isolated RS485/422 port within a compact, rugged metal enclosure. The device is powered directly from the USB bus and uses the MOSCHIP MCS7840 controller, offering reliable, high-speed serial communication with built-in isolation for enhanced safety and noise immunity.

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### 2. Key Features

- Multi-Port Serial Expansion: Provides four independent serial communication ports in a single module — three isolated RS232 ports and one isolated RS485/422 port.
- USB 2.0 Interface: Fully compliant with USB 2.0 specifications, ensuring high-speed data transfer and backward compatibility with USB 1.1.
- Isolation Protection: Each serial port is galvanically isolated, protecting connected devices and the host system from ground loops and electrical surges.
- MOSCHIP MCS7840 Controller: Utilizes a reliable USB-to-serial bridge chip with integrated 512-byte FIFO buffers per port for smooth data flow and reduced latency.
- Auto Data Direction Control: RS485 interface supports automatic data direction control, simplifying half-duplex communication without additional software or hardware configuration.
- LED Indicators: Individual LED indicators for each port (A, B, C, D) display transmit/receive activity, plus a dedicated power LED for system status monitoring.
- Bus-Powered Operation: Draws power directly from the USB port (5VDC, 400mA), eliminating the need for an external power supply.
- Compact Metal Enclosure: Durable 90 × 150 × 27 mm metal housing provides electromagnetic shielding and mechanical protection.
- Flexible Configuration: RS422 or RS485 mode selectable via internal DIP switch.
- Plug-and-Play Installation: Supports hot-plugging and automatic COM port assignment under Windows and other operating systems.
- iSerial Feature Support: When programmed with a unique serial number in EEPROM, the MCS7840 chip retains consistent COM port assignments across different USB ports.

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### 3. Technical Specifications

Physical Characteristics:
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Enclosure Material: Metal (provides EMI shielding and durability)
- Weight: Not specified (approx. < 500 g typical for metal-cased converters)

Electrical Characteristics:
- Power Supply: USB bus-powered (5VDC ±5%)
- Current Consumption: 400 mA @ 5VDC
- Optional Power Mode: Self-powered version available (model UTS400S) for external 5VDC adapter operation

USB Interface:
- Connector Type: USB Type-B female
- Standard Compliance: USB 2.0 full-speed device controller
- FIFO Buffer: 512 bytes per serial port
- Chipset: MOSCHIP MCS7840

Serial Interfaces:
- Connector Type: DB9 male connectors (one per port)
- Number of Ports: 4 total (3 × isolated RS232, 1 × isolated RS485/422)
- Signal Isolation: Provided on all ports
- RS422/RS485 Configuration: Selectable via DIP switch
- RS485 Auto Direction Control: Supported
- Signal Pins (RS422/RS485): TX+, TX−, RX+, RX−, isolated GND
- RS485 2-Wire Mode: TX+/RX+ shorted as DATA+, TX−/RX− shorted as DATA−

Environmental Conditions:
- Operating Temperature: 0°C to 55°C
- Storage Temperature: 0°C to 65°C
- Operating Humidity: 10% to 95% RH (non-condensing)
- Storage Humidity: 5% to 95% RH (non-condensing)

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### 4. Functionality

Operational Overview:
The UTS031 functions as a USB-to-multi-serial converter, enabling a computer or embedded system to communicate with multiple serial devices simultaneously through a single USB connection. It converts USB data streams into isolated RS232 and RS485/422 signals, allowing seamless integration with industrial controllers, sensors, modems, and other serial-based equipment.

Use Cases and Applications:
- Industrial automation and control systems
- Data acquisition and monitoring
- Laboratory instrumentation
- POS (Point-of-Sale) systems
- SCADA and telemetry systems
- Serial device networking and diagnostics
- Communication with PLCs, barcode scanners, and serial printers

Compatibility:
- Compatible with Windows, Linux, and other operating systems supporting USB CDC or virtual COM port drivers.
- Supports hot-plugging and automatic detection by the host system.
- Retains consistent COM port numbering when iSerial feature is enabled via EEPROM programming.

Communication Modes:
- RS232: Standard asynchronous serial communication for legacy devices.
- RS422: Differential signaling for long-distance, high-speed communication.
- RS485: Multi-drop communication for up to 32 devices on a single bus, with automatic data direction control.

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### 5. Components & Accessories

Included Items:
- UTS031 converter unit (metal enclosure)
- USB cable (model U101): 6-foot USB Type-A to Type-B cable
- User documentation and driver support (available from manufacturer website)

Optional Accessories:
- External 5VDC power adapter (for self-powered variant UTS400S)
- Mounting brackets or DIN-rail adapters (optional, depending on installation environment)

Connectors:
- USB Port: Type-B female (host connection)
- Serial Ports: Four DB9 male connectors (three for RS232, one for RS485/422)
- LED Indicators:
- PWR: Power ON indicator
- ATRD: Port A TXD/RXD activity
- BTRD: Port B TXD/RXD activity
- CTRD: Port C TXD/RXD activity
- DTRD: Port D TXD/RXD activity

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### 6. Installation & Setup

System Requirements:
- Available USB 2.0 or higher port
- Supported operating system with USB-to-serial driver support (Windows, Linux, macOS)
- No external power supply required (bus-powered operation)

Installation Steps:
1. Connect the UTS031 to the host computer using the supplied USB cable.
2. The operating system will detect the device and prompt for driver installation.
3. Install the appropriate driver (available from Rayon Technology or MOSCHIP).
4. Once installed, four virtual COM ports will appear in the system device manager.
5. Connect serial devices to the DB9 connectors as required.
6. For RS422/RS485 configuration, set the DIP switch inside the enclosure to the desired mode.
7. Verify communication using terminal software or application-specific tools.

Mounting Options:
- Desktop or panel mounting (standard)
- Optional DIN-rail mounting for industrial environments

Configuration Options:
- DIP switch selectable RS422/RS485 mode
- EEPROM programmable iSerial number for fixed COM port assignment

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### 7. Performance & Capabilities

Data Throughput:
- High-speed USB 2.0 interface ensures efficient data transfer between host and serial devices.
- 512-byte FIFO per port minimizes data loss and ensures smooth communication under heavy load.

Communication Speed:
- Supports standard baud rates up to 921.6 kbps (depending on host and device capabilities).

Isolation Performance:
- Electrical isolation between ports and host system prevents ground loops and protects against transient voltages.

Efficiency:
- Bus-powered design reduces cabling complexity and power supply requirements.
- Auto-direction control in RS485 mode simplifies half-duplex communication.

Limitations:
- Operating temperature limited to 55°C; not suitable for extreme industrial environments without additional cooling.
- DIP switch access requires opening the metal enclosure for configuration changes.

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### 8. Standards & Compliance

Compliance and Certifications:
- USB 2.0 Specification: Fully compliant
- RS232/RS422/RS485 Standards: EIA/TIA compliant
- EMI/EMC: Metal enclosure provides shielding against electromagnetic interference
- RoHS Compliance: Manufactured with lead-free components (typical for Rayon products)
- Safety: Isolation design enhances operator and equipment safety in industrial environments

Industry Standards Supported:
- EIA/TIA-232-F (RS232)
- EIA/TIA-422-B (RS422)
- EIA/TIA-485-A (RS485)
- USB Implementers Forum (USB-IF) compliance for USB 2.0 devices

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### 9. Additional Information

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

Technical Support:
- Email and phone support available through Rayon Technology.
- Driver downloads, firmware updates, and documentation accessible via official website.

Maintenance:
- No periodic maintenance required.
- Keep connectors clean and free from dust.
- Avoid exposure to moisture or corrosive environments.

Firmware & Driver Updates:
- Updated drivers and utilities available for Windows and Linux platforms.
- EEPROM can be programmed for iSerial functionality to maintain consistent COM port mapping.

Product Family Context:
The UTS031 belongs to Rayon’s UTS400 series, which includes multiple models offering different combinations of RS232, RS422, and RS485 interfaces. The series provides flexibility for various industrial and commercial applications:
- UTS400: 4×RS232
- UTS040: 4×Isolated RS232
- UTS004: 4×Isolated RS422/485
- UTS031: 3×Isolated RS232 + 1×Isolated RS485/422 (this model)
- UTS022: 2×Isolated RS232 + 2×Isolated RS485/422
- UTS013: 1×Isolated RS232 + 3×Isolated RS485/422

Model Selection Guidance:
- Standard Models: For basic RS232 expansion (e.g., UTS400, UTS104P).
- Isolated Models: For safety-critical or noisy environments (e.g., UTS040, UTS004).
- Flexible Models: For configurable RS232/RS422/RS485 ports (e.g., UTS114, UTS111).
- Special Models: For mixed or application-specific configurations (e.g., UTS301-I, UTS310-I).

Revision Information:
- Document Revision: 1.1 (Preliminary)
- Date: August 7, 2006

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### Summary

The Rayon UTS031 USB 2.0 to Isolated 3×RS232 + 1×RS485/422 Converter is a robust, industrial-grade communication interface designed for users requiring multiple isolated serial connections through a single USB port. Featuring the MOSCHIP MCS7840 controller, 512-byte FIFO buffers, and full galvanic isolation, it ensures reliable, interference-free data transmission across diverse serial communication environments. Its compact metal housing, LED indicators, and plug-and-play USB interface make it ideal for industrial automation, laboratory instrumentation, and data acquisition systems. With flexible configuration options, compliance with major communication standards, and support for iSerial functionality, the UTS031 delivers both performance and reliability in demanding serial communication applications.