Comprehensive Product Summary – UTS040 USB 2.0 to Isolated 4×RS232 Converter
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### 1. Product Overview

Product Name: USB 2.0 to Isolated 4×RS232 Converter
Model: UTS040
Series: UTS400 Series
Article Number: UTS040
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 UTS040 is a high-performance USB 2.0 to isolated 4-port RS232 converter designed for industrial, laboratory, and commercial applications requiring multiple serial communication channels with electrical isolation. It provides four independent, ground-isolated RS232 interfaces in a single compact metal enclosure, ensuring reliable data transmission and protection against ground loops and electrical noise. The device is powered directly from the USB bus (5VDC, 400mA) and uses the MOSCHIP MCS7840 controller for stable, high-speed serial communication.

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### 2. Key Features

- Four Independent RS232 Ports:
Provides four fully isolated RS232 serial ports (Ports A, B, C, D) in one compact module, each with independent signal ground isolation from the USB bus and from each other.

- USB 2.0 Interface:
Compliant with USB 2.0 full-speed specifications, ensuring compatibility with modern PCs and embedded systems.

- High-Performance MOSCHIP MCS7840 Controller:
Integrates a USB 2.0 device controller with four UART channels, each featuring a 512-byte FIFO buffer for efficient data handling and reduced latency.

- Electrical Isolation:
Each RS232 port is galvanically isolated, providing enhanced safety and protection against ground potential differences and electrical interference.

- LED Indicators per Channel:
Dedicated LED indicators for each port (ATRD, BTRD, CTRD, DTRD) display transmit/receive activity, plus a PWR LED for power status.

- Bus-Powered Operation:
Operates directly from the USB bus (5VDC, 400mA). Optional self-powered version (UTS040S) available for external 5VDC adapter operation.

- Compact Metal Enclosure:
Rugged 90 × 150 × 27 mm metal housing provides durability and EMI shielding for industrial environments.

- Plug-and-Play Installation:
Supports hot-plugging and automatic detection by operating systems. Compatible with Windows, Linux, and other USB-compliant platforms.

- iSerial Feature Support (via MCS7840):
When programmed with a unique EEPROM serial number, the converter retains consistent COM port assignments across different USB ports, simplifying multi-port system integration.

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### 3. Technical Specifications

Physical Dimensions:
- Width: 90 mm
- Length: 150 mm
- Height: 27 mm

Weight:
- Approx. 300–400 g (metal enclosure, including connectors)

Enclosure Material:
- Metal case for mechanical strength and EMI protection

USB Interface:
- Connector Type: USB Type-B female
- Standard: USB 2.0 (Full-Speed, 12 Mbps)
- Controller: MOSCHIP MCS7840
- FIFO Buffer: 512 bytes per serial port

RS232 Interface:
- Connector Type: DB9 male (x4)
- Number of Ports: 4 (Ports A, B, C, D)
- Signal Isolation: Each port isolated from USB ground and from each other
- Signal Lines: TXD, RXD, RTS, CTS, GND (isolated)
- Baud Rate: Up to 921.6 kbps (typical for MCS7840-based designs)
- Isolation Voltage: Typically 1–2 kV (manufacturer-dependent, not explicitly stated)

Power Requirements:
- Input Voltage: 5 VDC (via USB bus)
- Current Consumption: 400 mA typical
- Power Mode: Bus-powered (default)
- Optional Self-Powered Model: UTS040S (external 5VDC adapter input)

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

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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### 4. Functionality

Operating Principle:
The UTS040 functions as a USB-to-multi-serial converter, translating USB data packets into RS232 signals through the MCS7840 controller. Each of the four UART channels operates independently, allowing simultaneous communication with up to four RS232 devices. The built-in isolation circuitry ensures that each port’s ground reference is electrically separated, preventing cross-interference and protecting connected equipment from voltage surges or ground loops.

Use Cases and Applications:
- Industrial automation systems requiring multiple serial interfaces
- Laboratory instrumentation and data acquisition
- POS (Point-of-Sale) systems and barcode reader integration
- SCADA and process control systems
- Communication with PLCs, sensors, and legacy serial devices
- Redundant or backup serial communication setups
- Environments requiring electrical isolation for safety and signal integrity

Compatibility:
- Compatible with Windows, Linux, and other USB 2.0-compliant operating systems
- Supports standard COM port emulation for legacy software compatibility
- Hot-pluggable and automatically recognized by the host system

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### 5. Components & Accessories

Included Items:
- UTS040 main converter unit (metal enclosure)
- U101 USB cable (6 feet, USB Type-A to Type-B)
- User documentation (may vary by shipment)

Optional Accessories:
- External 5VDC power adapter (for UTS040S self-powered version)
- Mounting brackets or DIN-rail adapters (optional, depending on installation environment)

Connectors:
- USB Port: Type-B female connector for host connection
- RS232 Ports: Four DB9 male connectors labeled A, B, C, D

Related and Compatible Products:
- UTS400: USB to four standard RS232 ports (non-isolated)
- UTS004: USB to four isolated RS422/RS485 ports
- UTS485: USB to two RS232 and two isolated RS422/RS485 ports
- TWIN485: Two-port isolated RS232 to RS422/485 converter

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### 6. Installation & Setup

System Requirements:
- Host computer with available USB 2.0 port
- Operating system supporting USB serial drivers (Windows, Linux, macOS)
- No external power supply required for standard UTS040 model

Installation Steps:
1. Connect the UTS040 to the host computer using the supplied U101 USB cable.
2. The operating system automatically detects the device and installs the appropriate USB-to-serial drivers (MCS7840-based).
3. Verify that four new COM ports appear in the system device manager.
4. Connect RS232 devices to the DB9 male connectors labeled A–D.
5. Observe LED indicators for power and data activity.

Configuration:
- No manual configuration required for standard RS232 operation.
- For advanced applications, EEPROM programming can enable the iSerial feature, ensuring consistent COM port numbering across USB ports.
- Optional DIP switch configuration is available on other UTS400 series models for RS422/485 selection (not applicable to UTS040).

Mounting Options:
- Desktop placement or panel mounting using optional brackets.
- Compact form factor allows integration into control cabinets or test benches.

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### 7. Performance & Capabilities

Data Throughput:
- Each RS232 port supports high-speed communication up to 921.6 kbps (typical for MCS7840).
- 512-byte FIFO per port ensures smooth data flow and minimizes CPU overhead.

Isolation Performance:
- Each port is galvanically isolated, preventing electrical interference and ensuring reliable operation in noisy environments.
- Isolation protects both host and connected devices from transient voltages and ground potential differences.

Power Efficiency:
- Consumes only 400 mA from the USB bus, eliminating the need for external power in most applications.
- Optional self-powered version (UTS040S) supports external 5VDC input for systems with limited USB power availability.

Reliability:
- Metal enclosure provides mechanical protection and EMI shielding.
- LED indicators allow quick visual diagnostics of communication status.
- Designed for continuous operation in industrial and commercial environments.

Limitations:
- RS232 only (no RS422/485 support in this model).
- Maximum of four ports per module; expansion requires additional units.
- Isolation voltage not explicitly specified; consult manufacturer for high-voltage applications.

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### 8. Standards & Compliance

Interface Standards:
- USB 2.0 Full-Speed (12 Mbps)
- RS232 (EIA/TIA-232 standard)

Electrical & Safety Compliance:
- Designed for compliance with CE and FCC Class B (typical for industrial communication devices)
- RoHS-compliant materials (lead-free construction)

Industry Standards:
- Compatible with standard serial communication protocols
- Supports iSerial feature per MOSCHIP MCS7840 specification for consistent COM port assignment

Regulatory Notes:
- All product names and trademarks are the property of their respective owners.
- Manufactured by Rayon Technology Co., Ltd., Taiwan.

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year; confirm with distributor) covering defects in materials and workmanship.

Technical Support:
- Provided by Rayon Technology via email and telephone.
- Firmware and driver updates available through the official website.

Maintenance:
- No periodic maintenance required.
- Keep connectors clean and free from dust.
- Avoid exposure to moisture or extreme temperatures beyond specified limits.

Firmware & Driver Updates:
- Drivers for Windows and Linux available from Rayon Technology or MOSCHIP (now ASIX Electronics).
- EEPROM programming tools available for enabling iSerial functionality.

Product Family Overview:
The UTS040 belongs to Rayon’s UTS400 series of USB-to-serial converters, offering a wide range of configurations:
- UTS400: 4×RS232 (non-isolated)
- UTS040: 4×Isolated RS232
- UTS004: 4×Isolated RS422/485
- UTS485: 2×RS232 + 2×Isolated RS422/485
- UTS022 / UTS013 / UTS031: Mixed combinations of isolated RS232 and RS422/485 ports

This modular approach allows users to select the optimal model for their communication requirements, balancing cost, isolation, and flexibility.

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

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### Summary

The Rayon UTS040 USB 2.0 to Isolated 4×RS232 Converter is a robust, industrial-grade communication interface designed to expand a computer’s serial connectivity through a single USB port. Featuring four fully isolated RS232 channels, the UTS040 ensures safe, interference-free communication with multiple serial devices simultaneously. Its use of the MOSCHIP MCS7840 controller provides reliable performance, large FIFO buffers, and optional iSerial functionality for consistent COM port mapping.

Compact, bus-powered, and easy to install, the UTS040 is ideal for industrial automation, laboratory instrumentation, and any environment requiring multiple isolated serial connections. With its durable metal housing, LED diagnostics, and flexible power options, it delivers both performance and reliability in demanding applications.

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Manufacturer:
RAYON TECHNOLOGY CO., LTD.
2F, No. 177, Chung-Shan 2 Rd., Lu-Chou City, Taipei Hsien, Taiwan
Tel: +886-2-82858362 Fax: +886-2-82857065
Email: rayon@ms1.hinet.net Web: [www.rayontech.com](http://www.rayontech.com)

*All specifications subject to change without notice. All trademarks are the property of their respective owners.*