Comprehensive Product Summary – UTS111-I USB 2.0 to Isolated RS232/RS422/RS485 Converter

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### 1. Product Overview

Product Name: UTS111-I
Model: UTS111-I
Series: UTS USB-to-Serial Converter Series
Article Number: UTS111-I
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 / info@rayontech.com.tw
- Website: [www.rayontech.com.tw](http://www.rayontech.com.tw) / [www.rayontech.com](http://www.rayontech.com)

Product Description:
The Rayon UTS111-I is a USB 2.0 to isolated single-port RS232/RS422/RS485 converter designed for industrial, laboratory, and commercial applications requiring reliable, electrically isolated serial communication. It provides a flexible, selectable interface supporting RS232, RS422, or RS485 modes through DIP switch configuration. The device is housed in a durable metal enclosure and operates in bus-powered mode via the USB interface, with optional external power support. It integrates the ASIX MCS7810 USB-to-serial controller chip, offering a 512-byte FIFO buffer per serial port for efficient data handling and stable communication performance.

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### 2. Key Features

- Multi-Protocol Serial Support:
Supports one ground-isolated serial port configurable as RS232, RS422, or RS485 via DIP switch selection.

- USB 2.0 Interface:
Compliant with USB 2.0 full-speed specifications, ensuring compatibility with modern host systems and backward compatibility with USB 1.1.

- Electrical Isolation:
Provides galvanic isolation between the USB interface and the serial communication port, enhancing safety and preventing ground loop interference in industrial environments.

- ASIX MCS7810 Controller:
Utilizes the ASIX MCS7810 USB-to-serial bridge chip, offering stable performance, low latency, and 512-byte FIFO buffering per port for smooth data flow.

- Auto Data Direction Control (RS485 Mode):
Automatically manages data direction in RS485 mode, eliminating the need for manual RTS control and simplifying half-duplex communication setups.

- LED Indicators:
Equipped with LED indicators for power (PWR) and serial port activity (TXD/RXD), providing clear visual status feedback.

- Bus-Powered Operation:
Operates directly from the USB bus power (5VDC, 200mA typical), eliminating the need for an external power adapter in most applications.

- Compact Metal Enclosure:
Rugged metal housing (92 × 118 × 27 mm) provides mechanical protection and EMI shielding, suitable for industrial and field use.

- Flexible Configuration:
DIP switch selectable interface type (RS232, RS422, or RS485) allows versatile deployment across different communication standards.

- High Reliability and Safety:
Designed for environments requiring electrical isolation and robust communication, such as automation systems, data acquisition, and industrial control.

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### 3. Technical Specifications

USB Interface:
- Connector Type: USB Type-B female
- Standard: USB 2.0 full-speed (12 Mbps)
- Controller: ASIX MCS7810
- FIFO Buffer: 512 bytes per serial port
- Power Source: USB bus-powered (5VDC ±5%)
- Current Consumption: 200 mA typical @ 5VDC

Serial Interface (RS232/RS422/RS485):
- Connector Type: DB9 male
- Number of Ports: 1
- Interface Selection: DIP switch configurable
- Signal Pins: TX+, TX−, RX+, RX−, GND
- Isolation: Ground-isolated serial port
- RS485 Mode: Auto Data Direction Control supported
- RS422 Mode: Full-duplex differential signaling
- RS232 Mode: Standard single-ended signaling

Indicators:
- PWR LED: Indicates DC power input active
- Serial1 LED: Indicates TXD/RXD activity on port 1

Physical Characteristics:
- Enclosure Material: Metal
- Dimensions: 92 mm (W) × 118 mm (L) × 27 mm (H)
- Weight: Approx. 250 g (typical, including enclosure)

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 Requirements:
- Input Voltage: 5VDC (via USB bus)
- Current Draw: 200 mA typical, 400 mA maximum

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### 4. Functionality

Operational Overview:
The UTS111-I functions as a USB-to-serial communication bridge, enabling computers without native serial ports to interface with RS232, RS422, or RS485 devices. The converter translates USB data packets into serial communication signals and vice versa, maintaining data integrity and timing accuracy through its internal FIFO buffering.

Interface Selection:
A DIP switch located on the device allows users to select the desired communication standard:
- RS232 Mode: For standard serial communication with PCs, modems, or legacy equipment.
- RS422 Mode: For long-distance, full-duplex differential communication.
- RS485 Mode: For multi-drop, half-duplex differential communication with automatic data direction control.

Use Cases and Applications:
- Industrial automation and control systems
- Data acquisition and monitoring
- Laboratory instrumentation
- Point-of-sale (POS) systems
- SCADA and telemetry systems
- Serial device networking and remote monitoring
- Communication with PLCs, sensors, and controllers

Compatibility:
- Compatible with Windows, Linux, and macOS operating systems supporting USB CDC or virtual COM port drivers.
- Works with standard serial communication software and terminal emulators.
- Backward compatible with USB 1.1 hosts.

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### 5. Components & Accessories

Included Components:
- UTS111-I converter unit (metal enclosure)
- USB Type-A to Type-B cable (typically included)
- User manual or quick start guide

Optional Accessories:
- TB485: DB9 female to RS485 terminal block adapter kit for easy wiring to RS485 networks.
- External Power Supply (optional): For self-powered operation if required by specific applications.

Connectors:
- USB Port: Type-B female connector for host connection.
- Serial Port: DB9 male connector for RS232/RS422/RS485 interface.

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### 6. Installation & Setup

System Requirements:
- Host computer with available USB 2.0 or higher port
- Supported operating system with USB-to-serial driver support
- Optional external power supply (if not using bus power)

Installation Steps:
1. Connect the UTS111-I to the host computer using the supplied USB cable.
2. Install the appropriate driver (if required) for the ASIX MCS7810 chipset.
3. Configure the DIP switch to select the desired serial interface mode (RS232, RS422, or RS485).
4. Connect the serial device to the DB9 male connector.
5. Verify LED indicators: PWR LED should illuminate, and Serial1 LED should blink during data transmission.

Mounting Options:
- Desktop placement
- Panel or DIN-rail mounting (with optional brackets)
- Suitable for integration into control cabinets or test benches

Configuration:
- DIP switch for interface selection
- Auto Data Direction Control in RS485 mode (no manual configuration required)
- COM port number assigned automatically by the operating system

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### 7. Performance & Capabilities

Data Handling:
- 512-byte FIFO buffer per serial port ensures smooth data flow and minimizes latency.
- Supports full-duplex (RS232/RS422) and half-duplex (RS485) communication modes.

Speed and Throughput:
- USB 2.0 full-speed (12 Mbps) interface bandwidth
- Serial data rates up to 921.6 kbps (typical, depending on host and driver support)

Efficiency:
- Bus-powered operation reduces cabling complexity.
- Auto Data Direction Control optimizes RS485 communication timing.
- Ground isolation enhances signal integrity and protects against electrical noise.

Limitations:
- Single-port configuration (one serial channel)
- Operating temperature limited to 55°C maximum
- Requires driver installation for some operating systems

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### 8. Standards & Compliance

Electrical and Communication Standards:
- USB 2.0 full-speed compliance
- RS232 (EIA/TIA-232), RS422 (EIA/TIA-422), and RS485 (EIA/TIA-485) compliant signaling
- Ground isolation for enhanced safety and noise immunity

Safety and Environmental Compliance:
- Designed for industrial-grade operation
- RoHS compliant materials (lead-free construction)
- Meets CE and FCC Class A/B emission standards (typical for Rayon industrial converters)

Industry Standards Supported:
- USB CDC (Communications Device Class)
- Virtual COM port emulation for legacy software compatibility

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### 9. Additional Information

Warranty:
Standard manufacturer warranty (typically 1 year, depending on region and distributor policy). Covers defects in materials and workmanship under normal use.

Technical Support:
Rayon Technology provides technical assistance via email and phone. Updated drivers and documentation are available on the official website.

Maintenance:
- No user-serviceable internal components.
- Periodic inspection recommended for connector cleanliness and cable integrity.
- Ensure adequate ventilation and avoid exposure to excessive humidity or vibration.

Firmware and Driver Updates:
- Driver updates available for Windows, Linux, and macOS platforms.
- Firmware updates (if applicable) provided through Rayon’s support channels.

Related and Compatible Models:
- UTS111: Non-isolated version of UTS111-I (cost-effective model).
- UTS112 / UTS112-I: Dual-port versions with or without isolation.
- UTS134i: Four-port isolated RS422/RS485 model.
- UTS101-I: Single-port isolated RS232 model.
- UTS485: Combination model with two RS232 and two isolated RS422/RS485 ports.

Model Comparison Summary:

| Model | RS232 | RS422/485 | Isolated RS232 | Isolated RS422/485 | Total Ports |
|--------|--------|------------|----------------|--------------------|--------------|
| UTS101-I | – | – | 1 | – | 1 |
| UTS111-I | – | – | 1 | 1 | 1 |
| UTS112-I | – | – | 2 | 2 | 2 |
| UTS131-I | – | – | – | 1 | 1 |
| UTS134i | – | – | – | 4 | 4 |
| UTS400 | 4 | – | – | – | 4 |
| UTS485 | 2 | – | – | 2 | 4 |

Product Family Overview:
Rayon’s UTS series includes a wide range of USB-to-serial converters designed for various industrial and commercial applications. The UTS111-I occupies a unique position as a single-port, ground-isolated, multi-protocol converter offering both flexibility and safety in one compact module.

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### Summary

The Rayon UTS111-I is a robust, industrial-grade USB 2.0 to isolated RS232/RS422/RS485 converter designed for users who require flexible serial communication with electrical isolation. Featuring the ASIX MCS7810 controller, 512-byte FIFO buffering, and automatic RS485 data direction control, it ensures reliable and efficient data transmission across diverse applications. Its metal enclosure, LED indicators, and DIP switch configurability make it suitable for demanding environments such as automation, instrumentation, and data acquisition systems. With bus-powered operation, compact dimensions, and compliance with major communication standards, the UTS111-I delivers a safe, versatile, and high-performance solution for modern serial connectivity needs.