Comprehensive Product Summary – RAYON UTS220 USB 2.0 to 2×RS232 and Isolated 2×RS232 Converter

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### 1. Product Overview

Product Name: USB 2.0 to 2×RS232 and Isolated 2×RS232 Converter
Model: UTS220
Series: UTS400 Series – USB to Serial Port Converter Family
Article Number: UTS220
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 UTS220 is a high-performance external USB 2.0 to serial converter module designed to provide four independent serial communication ports within a single compact metal enclosure. It integrates two standard RS232 ports and two isolated RS232 ports, offering both flexibility and electrical isolation for industrial, laboratory, and commercial applications. The device is powered directly from the USB bus and uses the MOSCHIP MCS7840 controller for reliable multi-port serial communication.

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### 2. Key Features

- Four Serial Ports in One Module:
Provides two standard RS232 ports and two isolated RS232 ports, enabling simultaneous communication with multiple serial devices.

- USB 2.0 Interface:
Fully compliant with USB 2.0 specifications, ensuring high-speed data transfer and backward compatibility with USB 1.1 hosts.

- MOSCHIP MCS7840 Controller:
Utilizes the MCS7840 USB-to-serial bridge chip, supporting up to four independent serial channels with 512-byte FIFO buffers per port for efficient data handling.

- Electrical Isolation:
Two of the four ports are galvanically isolated RS232 interfaces, protecting connected equipment from ground loops and electrical noise.

- LED Indicators per Channel:
Each port features dedicated TX/RX activity LEDs (ATRD, BTRD, CTRD, DTRD) for real-time communication status monitoring, plus a PWR LED for power indication.

- Bus-Powered Operation:
Operates directly from the USB bus (5VDC, 400mA), eliminating the need for an external power supply. Optional self-powered versions (UTS400S) are available for higher current requirements.

- Compact Metal Enclosure:
Durable metal housing (90 × 150 × 27 mm) provides mechanical protection, EMI shielding, and improved heat dissipation.

- Flexible Configuration:
Supports RS232 and isolated RS232 interfaces; other models in the UTS400 series support RS422/RS485 or mixed configurations.

- Plug-and-Play USB Connectivity:
Supports hot-plugging and automatic COM port assignment under Windows operating systems.

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

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### 3. Technical Specifications

Physical Characteristics:
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Enclosure Material: Metal (EMI-shielded aluminum alloy)
- Weight: Approx. 350–400 g (typical, including enclosure and connectors)

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

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
- Data Transfer Rate: Up to 12 Mbps (USB 2.0 full-speed)

Serial Port Interface:
- Connector Type: DB9 male connectors (four total)
- Interface Types:
- 2 × RS232 (standard)
- 2 × Isolated RS232 (galvanically isolated)
- Signal Pins (per port): TX+, TX−, RX+, RX−, isolated GND
- Isolation Voltage: Typically 1 kV (for isolated ports)
- Number of Ports: 4 total (A, B, C, D)
- RS485 Auto Direction Control: Supported on RS485-capable models (not applicable to UTS220)
- Baud Rate Range: Up to 921.6 kbps (typical for MCS7840-based designs)

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 UTS220 functions as a USB-to-multi-serial converter, allowing a host computer to communicate with up to four serial devices simultaneously. Two ports provide standard RS232 signaling, while the other two offer isolated RS232 connections for enhanced safety and noise immunity. The device enumerates as four independent COM ports under the operating system, each accessible through standard serial communication APIs.

Use Cases and Applications:
- Industrial automation and control systems
- Laboratory instrumentation and data acquisition
- Point-of-Sale (POS) terminals and barcode scanners
- CNC machine interfaces
- Modem, printer, or legacy serial device connectivity
- Environments requiring electrical isolation between host and peripheral devices

Compatibility:
- Compatible with Windows, Linux, and macOS operating systems supporting USB CDC or vendor-specific drivers for MCS7840.
- Backward compatible with USB 1.1 hosts.
- Supports hot-plugging and automatic device recognition.

Communication Flow:
Data transmitted from the host via USB is converted by the MCS7840 controller into serial data streams for each port. Each port’s FIFO buffer ensures smooth data flow even under high-load conditions. The isolated ports use optocouplers or isolation transformers to separate ground potentials, preventing interference and protecting connected equipment.

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### 5. Components & Accessories

Included Items:
- UTS220 converter module (metal enclosure)
- USB cable (model U101): 6-foot USB Type-A to Type-B cable
- User documentation and driver CD (depending on shipment package)

Optional Accessories:
- External 5VDC power adapter (for self-powered variants)
- Mounting brackets or DIN-rail adapters (optional, depending on installation environment)
- Replacement USB cables or serial extension cables

Connectors:
- USB Port: 1 × USB Type-B female
- Serial Ports: 4 × DB9 male connectors (two standard RS232, two isolated RS232)
- LED Indicators:
- PWR: Power ON indicator
- ATRD, BTRD, CTRD, DTRD: TX/RX activity indicators for ports A–D

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### 6. Installation & Setup

System Requirements:
- Host computer with available USB 2.0 or higher port
- Supported operating system (Windows, Linux, macOS)
- Driver installation (if required for MCS7840 chipset)

Installation Steps:
1. Connect the UTS220 to the host computer using the supplied USB cable.
2. The operating system detects the device and installs the appropriate driver.
3. Verify COM port assignments in the Device Manager (Windows) or equivalent system utility.
4. Connect serial devices to the DB9 connectors labeled A–D.
5. Observe LED indicators to confirm communication activity.

Mounting Options:
- Desktop placement (standard)
- Optional wall or DIN-rail mounting using brackets (if available)
- Ensure adequate ventilation and avoid exposure to excessive heat or moisture.

Configuration:
- No DIP switch configuration required for UTS220 (fixed RS232 and isolated RS232 ports).
- Other UTS400 models may include DIP switches for RS422/RS485 selection.
- COM port numbering can be managed via the iSerial feature if EEPROM serial numbers are programmed.

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### 7. Performance & Capabilities

Data Throughput:
- Each serial port supports high-speed communication up to 921.6 kbps.
- USB 2.0 full-speed interface ensures stable data transfer between host and serial devices.

FIFO Buffering:
- 512-byte transmit and receive FIFO per port minimizes data loss and latency during high-speed communication.

Isolation Performance:
- Isolated RS232 ports provide galvanic separation between host and connected devices, reducing risk of ground loops and electrical surges.

Power Efficiency:
- Operates entirely from USB bus power (400 mA typical), suitable for portable or embedded applications.
- Optional self-powered configuration available for higher current draw or extended cable lengths.

Limitations:
- RS422/RS485 not supported on UTS220 (available on other UTS400 variants).
- Isolation applies only to designated isolated RS232 ports.
- Total current draw limited by USB port capability (ensure host port supports 500 mA minimum).

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### 8. Standards & Compliance

Compliance and Certifications:
- USB Specification: Compliant with USB 2.0 standard
- Serial Communication Standards: RS232 (EIA/TIA-232)
- Isolation Standards: Meets industrial isolation requirements for RS232 (typical 1 kV isolation)
- Environmental Compliance: RoHS compliant (lead-free construction)
- EMI/EMC: Metal enclosure provides shielding against electromagnetic interference
- Safety: Designed for industrial-grade operation with isolation protection on designated ports

Industry Standards Supported:
- USB CDC (Communications Device Class)
- EIA/TIA-232 for serial communication
- MOSCHIP MCS7840 chipset compliance with USB-IF standards

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year, depending on region and distributor policy) covering defects in materials and workmanship.

Technical Support:
- Provided by RAYON TECHNOLOGY CO., LTD. via email or phone.
- Driver updates and documentation available on the official website.

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

Firmware & Driver Updates:
- MCS7840 chipset drivers available for Windows and Linux platforms.
- iSerial feature can be enabled by programming a unique serial number into the onboard EEPROM, ensuring consistent COM port assignment across USB ports.

Product Family Context:
The UTS220 belongs to the UTS400 series, a modular family of USB-to-serial converters offering various combinations of RS232, isolated RS232, RS422, and RS485 interfaces. The series includes models such as:
- UTS400: 4×RS232
- UTS040: 4×Isolated RS232
- UTS004: 4×Isolated RS422/485
- UTS022: 2×Isolated RS232 + 2×Isolated RS422/485
- UTS220: 2×RS232 + 2×Isolated RS232 (this model)

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

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### Summary

The RAYON UTS220 USB 2.0 to 2×RS232 and Isolated 2×RS232 Converter is a robust, industrial-grade communication interface solution designed for users who require multiple serial connections with a mix of standard and isolated ports. Its integration of the MOSCHIP MCS7840 controller ensures reliable, high-speed data transfer across four independent channels, while the metal enclosure provides durability and EMI protection. With plug-and-play USB connectivity, LED diagnostics, and optional iSerial functionality, the UTS220 simplifies multi-port serial communication in industrial, laboratory, and commercial environments.

Its combination of electrical isolation, compact design, and USB bus-powered operation makes it an ideal choice for applications where safety, reliability, and flexibility are paramount.