Comprehensive Product Summary – UTS400 USB 2.0 to 4×RS232 Converter
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### 1. Product Overview

Product Name: UTS400 USB to Serial Port Converter
Model: UTS400
Series: UTS400 Series (part of Rayon’s USB-to-Serial Converter family)
Article Number: UTS400
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 UTS400 is a high-performance USB 2.0 to 4-port RS232 converter designed for industrial, commercial, and system integration applications requiring multiple serial interfaces through a single USB connection. Encased in a durable metal housing, the UTS400 provides four independent RS232 serial ports, each with its own LED activity indicator, and is powered directly from the USB bus. It utilizes the MOSCHIP MCS7840 chipset, offering reliable data transfer with 512-byte FIFO buffers per port for efficient communication and reduced latency.

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### 2. Key Features

- Four RS232 Ports in One Module:
Provides four independent RS232 serial interfaces (Ports A, B, C, D) in a single compact enclosure, ideal for multi-device connectivity.

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

- MOSCHIP MCS7840 Controller:
Integrates a proven USB-to-serial bridge controller supporting multiple UART channels, FIFO buffering, and iSerial functionality for consistent COM port assignment.

- 512-Byte FIFO per Serial Port:
Each RS232 channel includes a 512-byte transmit/receive FIFO buffer, minimizing data loss and improving throughput for high-speed serial communication.

- LED Indicators per Channel:
Individual TX/RX activity LEDs (ATRD, BTRD, CTRD, DTRD) for each port, plus a power indicator (PWR), provide real-time operational status.

- Bus-Powered Operation:
Draws power directly from the USB host (5VDC, 400mA typical), eliminating the need for an external power supply.

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

- Flexible Series Options:
The UTS400 series includes variants supporting isolated RS232, RS422, and RS485 interfaces (e.g., UTS040, UTS004, UTS485), offering scalability for different communication standards.

- Optional Self-Powered Version (UTS400S):
Available for applications requiring external 5VDC power input via adapter.

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

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### 3. Technical Specifications

Physical Characteristics:
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Enclosure Material: Metal (provides shielding and durability)
- Weight: Not specified (approx. 300–400 g typical for metal-cased converters)
- Color/Finish: Industrial metallic finish

USB Interface:
- Connector Type: USB Type-B female
- Standard Compliance: USB 2.0 (Full-Speed and High-Speed compatible)
- Controller IC: MOSCHIP MCS7840
- FIFO Buffer: 512 bytes per serial port
- Power Source: USB bus-powered (5VDC ±5%)
- Current Consumption: 400 mA typical (200 mA minimum operational current)

RS232 Interface:
- Connector Type: DB9 male (x4)
- Number of Ports: 4 (Ports A, B, C, D)
- Signal Lines: Standard RS232 signals (TXD, RXD, RTS, CTS, DTR, DSR, DCD, GND)
- Baud Rate: Dependent on host and driver configuration (typically up to 921.6 kbps)
- Isolation: None (for isolated models, see UTS040 or UTS004)
- LED Indicators:
- PWR – Power ON indicator
- ATRD – Port A TX/RX activity
- BTRD – Port B TX/RX activity
- CTRD – Port C TX/RX activity
- DTRD – Port D TX/RX activity

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)

Power Input:
- Mode: USB bus-powered (default)
- Optional Mode: Self-powered (UTS400S variant) using external 5VDC adapter

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### 4. Functionality

Operational Overview:
The UTS400 functions as a USB-to-multi-serial bridge, converting USB 2.0 signals from a host computer into four independent RS232 serial channels. Each channel operates as a standard COM port within the operating system, allowing legacy serial devices to communicate seamlessly with modern USB-only systems.

Use Cases and Applications:
- Industrial Automation: Connecting PLCs, sensors, and control modules to PCs or embedded controllers.
- POS Systems: Adding multiple serial ports for barcode scanners, receipt printers, and cash drawers.
- Networking and Communication: Managing serial-based modems, routers, or telemetry devices.
- Laboratory and Test Equipment: Interfacing with instruments requiring RS232 communication.
- System Integration: Expanding serial connectivity in servers, kiosks, or embedded systems.

Compatibility:
- Operating Systems: Compatible with Windows, Linux, and macOS (driver support dependent on MCS7840 chipset).
- USB Host Devices: Works with PCs, industrial computers, and embedded controllers supporting USB 2.0 or higher.
- Serial Devices: Any RS232-compliant equipment such as modems, terminals, or data acquisition systems.

Communication Behavior:
Each port operates independently, supporting full-duplex serial communication. The MCS7840 controller manages data buffering and flow control, ensuring stable transmission even under high data loads.

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### 5. Components & Accessories

Included Items:
- UTS400 Converter Unit (metal enclosure with four DB9 male connectors and one USB Type-B port)
- U101 USB Cable: 6-foot USB Type-A to Type-B cable for host connection

Optional Accessories:
- External 5VDC Power Adapter: For UTS400S self-powered variant
- Mounting Hardware: Optional brackets or DIN-rail adapters (depending on installation requirements)

Related and Compatible Products:
- TWIN485: Two-port ground-isolated RS232 to RS422/485 converter
- UTS040: USB to four ground-isolated RS232 ports
- UTS004: USB to four ground-isolated RS422/485 ports
- UTS485: USB to two RS232 and two ground-isolated RS422/485 ports

These related models provide extended functionality for applications requiring electrical isolation or mixed interface types.

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### 6. Installation & Setup

Requirements:
- Host computer with available USB 2.0 port
- Supported operating system with appropriate driver for MCS7840 chipset
- USB cable (included)

Installation Steps:
1. Connect the UTS400 to the host computer using the provided USB cable.
2. Install Drivers:
- Windows: Install the MCS7840 driver package (available from Rayon or MOSCHIP).
- Linux/macOS: Most modern kernels include native support for MCS7840-based devices.
3. Verify COM Ports:
- The system will enumerate four new COM ports (e.g., COM3–COM6).
4. Connect Serial Devices:
- Attach RS232 devices to the DB9 connectors labeled A–D.
5. Check LED Indicators:
- PWR LED confirms power status.
- ATRD/BTRD/CTRD/DTRD LEDs flash during data transmission.

Configuration Options:
- Bus-Powered Mode: Default configuration; draws power from USB host.
- Self-Powered Mode (UTS400S): Connect external 5VDC adapter for higher power requirements.

Mounting Options:
- Desktop placement or optional panel/DIN-rail mounting for industrial environments.

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### 7. Performance & Capabilities

Data Throughput:
- Each RS232 port supports high-speed communication up to 921.6 kbps (depending on driver and host performance).
- 512-byte FIFO buffers per port ensure smooth data flow and minimize overrun errors.

Latency and Efficiency:
- Low-latency USB-to-UART conversion via MCS7840 controller.
- Efficient bus-powered design reduces cabling complexity.

Power Efficiency:
- Consumes approximately 400 mA at 5VDC, suitable for most USB host ports without external power.

Limitations:
- No galvanic isolation (for isolation, use UTS040 or UTS004).
- RS232 only (no RS422/RS485 support in this base model).
- Dependent on host USB bandwidth when all four ports are active simultaneously.

Reliability:
- Industrial-grade metal enclosure enhances EMI protection and mechanical stability.
- Proven MOSCHIP chipset ensures long-term driver support and compatibility.

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### 8. Standards & Compliance

Interface Standards:
- USB 2.0 Specification (Full-Speed/High-Speed compliant)
- EIA/TIA RS232 Serial Communication Standard

Electrical & Environmental Compliance:
- RoHS compliant (lead-free construction)
- CE and FCC Class B (typical for Rayon’s industrial communication products)

Industry Standards Supported:
- UART-compatible serial communication
- Plug-and-play USB enumeration
- iSerial EEPROM feature for consistent COM port mapping

Certifications:
While specific certification numbers are not listed, Rayon’s USB-to-Serial products are typically tested for CE/FCC compliance and meet industrial-grade operational standards.

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### 9. Additional Information

Warranty:
Standard manufacturer warranty (typically one year) covering defects in materials and workmanship.

Technical Support:
Rayon Technology provides technical assistance via email and telephone. Firmware and driver updates are available through the company’s website.

Maintenance:
- No regular maintenance required beyond ensuring clean connectors and stable USB connections.
- Periodic firmware or driver updates recommended for optimal performance.

Firmware & Driver Updates:
- MCS7840 chipset drivers available from MOSCHIP or Rayon’s support page.
- EEPROM programming tools available for enabling iSerial functionality (optional).

Product Family Overview:
The UTS400 belongs to a broader family of USB-to-serial converters designed for various interface combinations and isolation requirements. The table below summarizes related models:

| 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 |
| UTS485 | 2 | 0 | 0 | 2 | 4 |
| UTS022 | 0 | 2 | 0 | 2 | 4 |
| UTS114 | 4 | 0 | 4 | 0 | 4 |

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

iSerial Feature (MCS7840/MCS7820):
The MCS7840 chipset supports an optional iSerial feature that assigns a unique serial number to each device via EEPROM. This ensures that COM port numbers remain consistent regardless of which USB port the device is connected to. This feature is particularly beneficial in systems with multiple USB ports or when multiple converters are used simultaneously, preventing port reassignment and simplifying software configuration.

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### Summary

The Rayon UTS400 USB 2.0 to 4×RS232 Converter is a robust, industrial-grade communication interface solution that bridges modern USB systems with legacy RS232 equipment. Featuring four independent serial ports, a reliable MOSCHIP MCS7840 controller, and a durable metal enclosure, it delivers stable, high-speed serial communication for a wide range of applications—from industrial automation to POS systems.

Its plug-and-play USB 2.0 interface, per-port LED indicators, and optional self-powered configuration make it both user-friendly and adaptable. The UTS400’s design emphasizes reliability, compactness, and performance, while the broader UTS400 series offers scalable options for isolated and mixed-interface environments.

With compliance to USB and RS232 standards, support for the iSerial feature, and comprehensive driver availability, the UTS400 remains a dependable choice for engineers, integrators, and system designers seeking multi-port serial connectivity through a single USB interface.

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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)

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