Comprehensive Product Summary – UTS112 USB 2.0 to Dual RS232/RS422/RS485 Converter (Bus Power Mode)

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### 1. Product Overview

Product Name: UTS112
Model: UTS112
Series: UTS Flexible USB-to-Serial Converter Series
Article Number: UTS112
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 UTS112 is a compact, metal-encased USB 2.0 to dual RS232/RS422/RS485 converter designed for industrial, commercial, and system integration applications requiring flexible serial communication interfaces. It provides two independent serial ports selectable via DIP switches, enabling users to configure each port as RS232, RS422, or RS485. The device operates in bus-powered mode, drawing power directly from the USB interface, and features LED indicators for power and data transmission status.

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### 2. Key Features

- Dual-Port Design: Supports two independent serial communication ports in a single enclosure, reducing space and cabling complexity.
- Multi-Protocol Support: Each port can be configured individually for RS232, RS422, or RS485 operation using DIP switches.
- USB 2.0 Interface: Compliant with USB 2.0 full-speed specifications, ensuring reliable data transfer and broad compatibility with modern systems.
- ASIX MCS7820 Chipset: Utilizes the ASIX MCS7820 USB-to-serial controller, providing stable performance and compatibility with major operating systems.
- 512-Byte FIFO Buffer per Port: Enhances data throughput and minimizes latency during high-speed communication.
- Auto Data Direction Control (RS485 Mode): Automatically manages data flow direction in RS485 mode, eliminating the need for manual RTS signal control.
- LED Indicators: Dedicated LEDs for power (PWR) and data transmission/reception (TXD/RXD) per port for easy status monitoring.
- Bus-Powered Operation: Draws power directly from the USB port (5VDC, 200mA typical), eliminating the need for an external power supply.
- Compact Metal Enclosure: Durable metal housing (92 × 118 × 27 mm) provides electromagnetic shielding and mechanical protection.
- Flexible Configuration: DIP switch selection allows quick reconfiguration between serial standards without additional hardware.
- Plug-and-Play Installation: Supports hot-plugging and automatic COM port assignment under Windows and other operating systems.
- iSerial Feature (via MCS7820): Supports unique serial number programming in EEPROM for consistent COM port assignment across USB ports.

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### 3. Technical Specifications

USB Interface:
- Standard: USB 2.0 Full-Speed (12 Mbps)
- Connector Type: USB Type-B female
- Controller IC: ASIX MCS7820
- FIFO Buffer: 512 bytes per serial port
- Power Source: USB bus-powered (5VDC)
- Current Consumption: 200 mA typical @ 5VDC

Serial Interface (RS232/RS422/RS485):
- Number of Ports: 2 independent serial channels (Port 1 and Port 2)
- Connector Type: DB9 male connectors
- Selectable Modes: RS232 / RS422 / RS485 (via DIP switch)
- Signal Pins (RS422/RS485): TX+, TX−, RX+, RX−, GND
- Auto Data Direction Control: Supported in RS485 mode
- Data Signals: Data+ and Data− can be assigned to TX+/TX− or RX+/RX− pairs depending on configuration

LED Indicators:
- PWR: Indicates USB power status (ON when powered)
- Serial1: TXD/RXD activity indicator for Port 1
- Serial2: TXD/RXD activity indicator for Port 2

Physical Characteristics:
- Enclosure Material: Metal (EMI-shielded)
- Dimensions: 92 mm (W) × 118 mm (L) × 27 mm (H)
- Weight: Approximately 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)

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### 4. Functionality

Operational Overview:
The UTS112 functions as a USB-to-serial communication bridge, allowing computers without native serial ports to interface with RS232, RS422, or RS485 devices. Each of the two serial ports can be independently configured for the desired communication standard using onboard DIP switches.

Use Cases and Applications:
- Industrial automation and control systems
- Data acquisition and monitoring
- POS (Point of Sale) systems
- Barcode scanners and receipt printers
- PLC and SCADA communication
- Serial device networking and diagnostics
- Laboratory instrumentation and test equipment

Compatibility:
- Compatible with Windows, Linux, and macOS operating systems supporting USB CDC or vendor-specific drivers.
- Supports hot-plugging and automatic COM port assignment.
- iSerial feature ensures consistent COM port numbering across different USB ports when EEPROM serial numbers are programmed.

Communication Modes:
- RS232 Mode: Standard full-duplex asynchronous communication for legacy serial devices.
- RS422 Mode: Differential signaling for long-distance, noise-immune communication.
- RS485 Mode: Half-duplex multi-drop communication with automatic data direction control.

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### 5. Components & Accessories

Included Components:
- UTS112 converter module (metal enclosure)
- USB Type-A to Type-B cable (typically included, depending on distributor)
- User manual or quick start guide

Optional Accessories:
- TB485 Terminal Block Kit: DB9 female to RS485 terminal block adapter for easy wiring to RS485 networks.
- Mounting brackets or DIN-rail adapters: Optional accessories for industrial installation (availability may vary).

Connectors:
- USB Port: Type-B female connector for host connection
- Serial Ports: Two DB9 male connectors for RS232/RS422/RS485 output

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### 6. Installation & Setup

System Requirements:
- Available USB 2.0 or higher port
- Supported operating system (Windows, Linux, macOS)
- Appropriate driver installation (if required by OS)

Installation Steps:
1. Connect the UTS112 to the host computer using a USB Type-A to Type-B cable.
2. Allow the operating system to detect and install the necessary drivers automatically or install Rayon-provided drivers if required.
3. Configure each serial port mode (RS232, RS422, or RS485) using the DIP switches located on the device.
4. Connect the serial devices to the DB9 connectors.
5. Verify power and communication status using the LED indicators.

Mounting Options:
- Desktop placement
- Optional wall or DIN-rail mounting (with accessory kit)

Configuration:
- DIP switch selection for interface type per port
- No external power supply required (bus-powered)
- Auto baud rate detection supported by host driver

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### 7. Performance & Capabilities

Data Throughput:
- USB 2.0 full-speed (12 Mbps) interface ensures stable communication for dual serial channels.
- 512-byte FIFO per port minimizes data loss and ensures smooth data streaming.

Speed and Capacity:
- Supports standard serial baud rates up to 921.6 kbps (depending on driver and system configuration).
- Each port operates independently, allowing simultaneous communication with two devices.

Efficiency:
- Bus-powered design reduces cabling and simplifies deployment.
- Auto Data Direction Control in RS485 mode optimizes half-duplex communication without software intervention.

Limitations:
- Non-isolated model (for applications requiring electrical isolation, Rayon offers the UTS112-I variant).
- Limited to USB 2.0 full-speed (not high-speed 480 Mbps).
- Requires DIP switch reconfiguration for interface type changes.

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### 8. Standards & Compliance

Compliance and Certifications:
- USB 2.0 Specification: Fully compliant with USB 2.0 full-speed standard.
- EMC/EMI Compliance: Metal enclosure provides shielding against electromagnetic interference.
- RoHS Compliance: Manufactured in accordance with environmental and safety standards (RoHS directive).
- Industry Standards:
- RS232 (EIA/TIA-232)
- RS422 (EIA/TIA-422)
- RS485 (EIA/TIA-485)

Regulatory Notes:
- Designed for industrial and commercial environments.
- Meets general CE and FCC requirements for USB peripheral devices (depending on region).

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year, depending on distributor policy).

Technical Support:
- Provided by Rayon Technology Co., Ltd. via email and online resources.
- Driver downloads and documentation available on the official website.

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

Firmware & Driver Updates:
- Firmware updates typically not required; driver updates available for new OS versions.
- iSerial feature supported when EEPROM is programmed with a unique serial number, ensuring consistent COM port mapping across USB ports.

Related and Upgrade Models:
Rayon offers a comprehensive range of USB-to-serial converters for various configurations and isolation requirements:
- UTS111: Single-port RS232/RS422/RS485 flexible model.
- UTS112-I: Dual-port ground-isolated RS232/RS422/RS485 model.
- UTS114: Four-port flexible RS232/RS422/RS485 model.
- UTS134: Four-port RS422/RS485 settable model.
- UTS134i: Four-port ground-isolated RS422/RS485 model.
- UTS400: Four-port RS232 cost-effective model.
- UTS040: Four-port ground-isolated RS232 model.
- UTS485: Two RS232 + two isolated RS422/RS485 ports hybrid model.

iSerial Feature (MCS7820/MCS7840):
The ASIX MCS7820 controller supports the iSerial feature, allowing each device to retain consistent COM port numbers across different USB ports when a unique serial number is programmed into the EEPROM. This prevents reallocation of COM numbers by the operating system and simplifies multi-port system integration.

Example:
- Without iSerial: COM port numbers change when connected to different USB ports.
- With iSerial: COM port numbers remain consistent regardless of USB port used.

This feature is particularly beneficial in industrial or laboratory environments where multiple USB-to-serial devices are deployed and consistent port mapping is critical.

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### Summary

The Rayon UTS112 USB 2.0 to Dual RS232/RS422/RS485 Converter is a robust, flexible, and cost-effective solution for expanding serial communication capabilities on modern computers. Its dual-port configuration, DIP switch-selectable interface modes, and bus-powered operation make it ideal for industrial automation, POS systems, and instrumentation applications. The use of the ASIX MCS7820 chipset ensures reliable performance, while the metal enclosure provides durability and EMI protection.

For users requiring electrical isolation or additional ports, Rayon’s extended UTS series offers compatible models with enhanced safety and scalability. The UTS112 stands out as a versatile, plug-and-play converter that bridges legacy serial devices with contemporary USB-based systems efficiently and reliably.

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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 / info@rayontech.com.tw
Web: [www.rayontech.com.tw](http://www.rayontech.com.tw)

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