Comprehensive Product Summary – UTS202 USB 2.0 to 2×RS232 and Isolated 2×RS485/422 Converter

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### 1. Product Overview

Product Name: USB 2.0 to 2×RS232 and Isolated 2×RS485/422 Converter
Model: UTS202
Series: UTS400 Series – USB to Serial Port Converter Family
Article Number: UTS202
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 UTS202 is a high-performance USB 2.0 to multi-serial converter designed to provide two standard RS232 ports and two isolated RS485/RS422 ports within a single, compact, metal-enclosed module. It belongs to the UTS400 series of USB-to-serial converters, offering flexible, reliable, and electrically isolated serial communication interfaces for industrial, laboratory, and commercial applications. The device is powered directly from the USB bus and uses the MOSCHIP MCS7840 controller, ensuring stable data transfer and compatibility with modern operating systems.

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### 2. Key Features

- Dual RS232 and Dual Isolated RS485/422 Ports: Provides two standard RS232 interfaces and two isolated RS485/422 interfaces for simultaneous multi-protocol communication.
- USB 2.0 Interface: Fully compliant with USB 2.0 specifications, supporting high-speed data transfer and backward compatibility with USB 1.1.
- MOSCHIP MCS7840 Controller: Integrated USB-to-serial bridge chip offering robust performance and advanced features such as iSerial support.
- 512-Byte FIFO per Serial Port: Each serial channel includes a 512-byte FIFO buffer for efficient data handling and reduced latency.
- LED Indicators per Channel: Individual LED indicators display transmit/receive activity for each port, plus a power indicator for system status monitoring.
- Bus-Powered Operation: Draws power directly from the USB port (5VDC, 400mA), eliminating the need for an external power supply.
- Metal Enclosure: Durable metal housing provides electromagnetic shielding and mechanical protection, suitable for industrial environments.
- Auto Data Direction Control (RS485): Automatically manages data direction in RS485 mode, simplifying half-duplex communication.
- Flexible Configuration: RS422 or RS485 mode selectable via DIP switch.
- Compact Design: Space-efficient form factor (90 × 150 × 27 mm) for easy integration into control panels or desktop setups.
- Hot-Pluggable USB Interface: Supports plug-and-play installation without system reboot.
- iSerial Feature Support: Retains consistent COM port assignments across different USB ports when EEPROM serial numbers are programmed.

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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 (UTS400S) for external 5VDC adapter operation.

USB Interface:
- Connector Type: USB Type-B female
- Standard Compliance: USB 2.0 (Full-Speed/High-Speed compatible)
- Controller IC: MOSCHIP MCS7840
- FIFO Buffer: 512 bytes per serial port
- Data Transfer Rate: Up to 12 Mbps (USB 2.0 Full-Speed)

Serial Port Interface:
- Connector Type: DB9 male connectors
- Number of Ports: 4 total (2×RS232, 2×Isolated RS485/422)
- Isolation: Optical/electrical isolation on RS485/422 channels
- Signal Pins (RS485/422): TX+, TX−, RX+, RX−, Isolated GND
- RS485 Auto Direction Control: Supported (TX+/RX+ shorted as DATA+, TX−/RX− shorted as DATA−)
- RS422/RS485 Selection: Configurable via DIP switch
- RS232 Signal Lines: TXD, RXD, DTR, DSR, RTS, CTS, DCD, RI, GND

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

The UTS202 functions as a USB-to-multi-serial converter, bridging modern USB interfaces with legacy serial communication standards. It allows a host computer to communicate with multiple serial devices simultaneously through a single USB connection.

Operation Principle:
- The MOSCHIP MCS7840 controller translates USB data packets into serial communication signals (RS232 or RS485/422).
- Each serial port operates independently, with dedicated FIFO buffers ensuring smooth data flow.
- RS485 ports include automatic data direction control, eliminating the need for manual RTS signal management.
- The device is recognized by the operating system as multiple virtual COM ports, enabling compatibility with standard serial communication software.

Typical Applications:
- Industrial automation and control systems
- Data acquisition and instrumentation
- POS (Point-of-Sale) systems
- SCADA and HMI interfaces
- Serial device networking and monitoring
- Laboratory equipment communication
- Barcode scanners, PLCs, and CNC controllers

Compatibility:
- Compatible with Windows, Linux, and other major operating systems supporting USB CDC or virtual COM drivers.
- Backward compatible with USB 1.1 hosts.
- Supports hot-plugging and automatic device recognition.

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### 5. Components & Accessories

Included Items:
- UTS202 Converter Unit (metal enclosure)
- USB Cable (Model U101): 6-foot USB Type-A to Type-B cable
- User documentation (may include quick start guide or datasheet)

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 (2×RS232, 2×Isolated RS485/422)
- LED Indicators:
- PWR: Power ON indicator
- ATRD: RS232 Port A TXD/RXD activity
- BTRD: RS232 Port B TXD/RXD activity
- CTRD: RS485/422 Port C TXD/RXD activity
- DTRD: RS485/422 Port D TXD/RXD activity

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### 6. Installation & Setup

Requirements:
- Available USB 2.0 or USB 1.1 port on host computer
- Supported operating system with USB-to-serial driver support
- Optional external power supply (if using self-powered variant)

Installation Steps:
1. Connect the UTS202 to the host computer using the provided USB cable.
2. The operating system will detect the device and install the appropriate drivers (may require manual driver installation for certain OS versions).
3. Verify COM port assignments in the system’s device manager.
4. Connect serial devices to the DB9 ports according to their interface type (RS232 or RS485/422).
5. Configure DIP switches to select RS422 or RS485 mode for the isolated ports as required.
6. Observe LED indicators to confirm power and communication activity.

Mounting Options:
- Desktop placement
- Panel or wall mounting (via optional brackets)
- DIN-rail mounting (optional accessory)

Configuration:
- DIP switch inside the enclosure allows selection between RS422 and RS485 modes.
- RS485 mode automatically manages data direction.
- iSerial feature can be enabled by programming a unique serial number into the MCS7840 EEPROM, ensuring consistent COM port numbering across USB ports.

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### 7. Performance & Capabilities

Data Throughput:
- USB 2.0 Full-Speed (12 Mbps) interface ensures efficient data transfer between host and serial devices.
- Each serial port supports high-speed communication, limited primarily by the connected device and driver configuration.

Buffering:
- 512-byte FIFO per port minimizes data loss and ensures stable communication under high-load conditions.

Isolation & Protection:
- Isolated RS485/422 ports provide electrical isolation to prevent ground loops and protect connected equipment from voltage surges or noise interference.

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

Limitations:
- Total current draw limited to 400 mA from USB bus; external power may be required for high-load configurations.
- RS485/422 and RS232 modes are fixed per port (2×RS232, 2×Isolated RS485/422) and cannot be interchanged without hardware modification.

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### 8. Standards & Compliance

Compliance and Certifications:
- USB 2.0 Specification: Fully compliant
- RS232/RS422/RS485 Standards: EIA/TIA compliant
- Electrical Isolation: Meets industrial-grade isolation standards for RS485/422 channels
- Environmental Compliance: Designed for operation within industrial temperature and humidity ranges
- EMI/EMC: Metal enclosure provides shielding against electromagnetic interference
- RoHS Compliance: Expected (typical for Rayon products; verify per batch)

Industry Standards Supported:
- EIA/TIA-232-F (RS232)
- EIA/TIA-422-B (RS422)
- EIA/TIA-485-A (RS485)
- USB 2.0 (Full-Speed)

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year; confirm with Rayon Technology).
- Covers defects in materials and workmanship under normal use.

Technical Support:
- Provided by Rayon Technology via email and telephone.
- Driver downloads and documentation available on the manufacturer’s website.

Maintenance:
- No routine maintenance required.
- Keep connectors clean and free from dust.
- Avoid exposure to excessive heat, moisture, or vibration.

Firmware & Driver Updates:
- Driver updates available for Windows and Linux platforms.
- Firmware updates (if applicable) can be obtained from Rayon Technology support.

Product Family Context:
The UTS202 is part of the UTS400 series, which includes multiple models with varying combinations of RS232, RS422, and RS485 ports. The series provides scalable solutions for different communication requirements:

| Model | RS232 | Isolated RS232 | RS422/485 | Isolated RS422/485 | Total Ports |
|--------|--------|----------------|------------|--------------------|--------------|
| UTS400 | 4 | 0 | 0 | 0 | 4 |
| UTS040 | 0 | 4 | 0 | 0 | 4 |
| UTS004 | 0 | 0 | 0 | 4 | 4 |
| UTS202 | 2 | 0 | 0 | 2 | 4 |
| UTS220 | 2 | 2 | 0 | 0 | 4 |
| UTS211 | 2 | 1 | 0 | 1 | 4 |

This modular approach allows users to select the optimal configuration for their specific application, balancing cost, isolation, and interface flexibility.

iSerial Feature (MCS7840/MCS7820):
The MCS7840 controller supports the iSerial feature, which allows each converter to retain consistent COM port numbers across different USB ports when a unique serial number is programmed into its EEPROM. This feature is particularly beneficial in systems with multiple USB ports or multiple converters, as it prevents COM port reassignment and simplifies software configuration.

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### Summary

The Rayon UTS202 USB 2.0 to 2×RS232 and Isolated 2×RS485/422 Converter is a robust, industrial-grade communication interface device designed to bridge modern USB systems with legacy serial equipment. Featuring the reliable MOSCHIP MCS7840 controller, 512-byte FIFO buffers, and isolated RS485/422 channels, it ensures stable, noise-resistant, and high-performance data transmission. Its compact metal enclosure, LED indicators, and plug-and-play USB interface make it ideal for industrial automation, laboratory instrumentation, and commercial serial communication applications. The UTS202 exemplifies Rayon Technology’s commitment to providing flexible, high-quality connectivity solutions for diverse serial communication environments.