Comprehensive Product Summary – UTS134-I USB 2.0 to Isolated 4×RS485/422 Converter (Self Power Mode)

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### 1. Product Overview

Product Name: UTS134-I
Model Number: UTS134-I
Series: UTS Industrial USB-to-Serial Converter Series
Article Number: UTS134-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
- Web: [www.rayontech.com](http://www.rayontech.com)

Product Description:
The Rayon UTS134-I is a high-performance USB 2.0 to isolated 4-port RS485/RS422 converter designed for industrial, automation, and communication applications requiring robust electrical isolation and reliable multi-port serial connectivity. It integrates four independent, ground-isolated RS422/RS485 ports within a compact metal enclosure, providing both USB bus-powered and self-powered operation modes. The device is built around the MOSCHIP MCS7840 USB-to-serial controller, offering advanced data handling with 512-byte FIFO buffers per port and automatic data direction control in RS485 mode.

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### 2. Key Features

- Four Independent Serial Ports:
Supports four isolated RS422/RS485 communication channels in a single compact module, ideal for multi-node or redundant serial communication systems.

- Full Electrical Isolation:
Each RS422/RS485 port is galvanically isolated from the USB bus and from each other, ensuring protection against ground loops, electrical noise, and transient surges.

- USB 2.0 Interface:
Compliant with USB 2.0 full-speed specifications, ensuring reliable data throughput and compatibility with modern host systems.

- MOSCHIP MCS7840 Controller:
Utilizes the MCS7840 chipset, providing stable USB-to-serial conversion, 512-byte FIFO per port, and support for the iSerial feature for consistent COM port assignment.

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

- Dual Power Modes:
Operates in USB bus-powered mode (5VDC, 400mA) or self-powered mode using an external 5V adapter (UP110/UP220 recommended).

- LED Indicators per Channel:
Dedicated TX/RX activity LEDs for each port (A, B, C, D) plus a power indicator LED for quick visual diagnostics.

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

- Flexible Configuration:
Each port can be configured as RS422 or RS485 via DIP switches, allowing versatile deployment across different communication standards.

- High Reliability and Redundancy:
Designed for monitoring, backup, and redundant communication setups in industrial control systems.

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### 3. Technical Specifications

USB Interface:
- Standard: USB 2.0 (Full-Speed)
- Connector Type: USB Type-B female
- Controller IC: MOSCHIP MCS7840
- FIFO Buffer: 512 bytes per serial port
- Data Transfer: Supports asynchronous serial communication
- iSerial Feature: Supported when EEPROM is programmed with a unique serial number (ensures consistent COM port assignment across USB ports)

RS422/RS485 Interface:
- Connector Type: DB9 male (per port)
- Number of Ports: 4 (labeled A, B, C, D)
- Signal Pins: TX+, TX−, RX+, RX−, isolated GND
- Isolation: Each port isolated from USB and from other ports
- Interface Selection: RS422 or RS485 selectable via DIP switch
- Auto Data Direction Control: Supported in RS485 mode
- Signal Pairing: Data+ and Data− can be assigned to TX+/TX− or RX+/RX− pairs

Power Requirements:
- Power Modes: USB bus-powered or self-powered
- Voltage: 5 VDC
- Current Consumption: 400 mA (typical)
- External Power Adapter (optional): UP110 or UP220 5V adapter

Physical Characteristics:
- Enclosure Material: Metal (EMI-shielded)
- Dimensions: 90 mm (W) × 150 mm (L) × 27 mm (H)
- Weight: Approx. 300–400 g (typical, including enclosure and connectors)

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

Operating Principle:
The UTS134-I functions as a USB-to-multi-serial converter, translating USB data streams from a host computer into four independent RS422 or RS485 serial channels. Each channel operates asynchronously and can be configured for either full-duplex (RS422) or half-duplex (RS485) communication. The MCS7840 controller manages data buffering and flow control, ensuring smooth data transmission even under high-load conditions.

Use Cases and Applications:
- Industrial automation and process control systems
- Building management and HVAC control
- SCADA and telemetry networks
- Data acquisition and monitoring systems
- Serial device networking and redundancy setups
- Communication with PLCs, sensors, and instrumentation
- Integration with legacy RS422/RS485 equipment via modern USB interfaces

Compatibility:
- Compatible with Windows, Linux, and other 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 (with reduced throughput).

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### 5. Components & Accessories

Included Items:
- UTS134-I 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
- User Documentation: Quick setup guide and technical reference

Optional Accessories:
- UP110/UP220 Power Adapter: 5VDC external power supply for self-powered operation
- TB485 Terminal Block Kit: DB9 female to RS485 terminal block adapter for easy field wiring
- Mounting Hardware: Optional brackets or DIN-rail adapters (depending on installation requirements)

LED Indicators:
- PWR: Power ON indicator (DC input active)
- ATRD, BTRD, CTRD, DTRD: TX/RX activity indicators for ports A, B, C, and D respectively

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### 6. Installation & Setup

System Requirements:
- Host computer with available USB 2.0 port
- Supported operating system with USB-to-serial driver (Windows/Linux)
- Optional external 5VDC power adapter for self-powered mode

Installation Steps:
1. Connect the USB Cable: Attach the included U101 cable between the host computer and the UTS134-I’s USB Type-B port.
2. Driver Installation: Install the appropriate MCS7840 driver if not automatically recognized by the OS.
3. Power Configuration:
- For bus-powered mode, the device draws power directly from the USB port.
- For self-powered mode, connect a 5VDC adapter (UP110/UP220) to the power input jack.
4. Interface Selection: Use the DIP switch to configure each port as RS422 or RS485.
5. Connect Serial Devices: Attach RS422/RS485 devices to the DB9 connectors using appropriate cables or terminal adapters.
6. Verify Operation: Check LED indicators for power and data activity.

Mounting Options:
- Desktop placement or panel mounting using optional brackets.
- Suitable for control cabinets or industrial enclosures.

Configuration Notes:
- Each port operates independently and can be configured for different communication modes.
- Auto Data Direction Control simplifies RS485 half-duplex communication without additional software control.

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### 7. Performance & Capabilities

Data Handling:
- 512-byte FIFO per port ensures smooth data flow and minimizes latency.
- Supports high-speed asynchronous serial communication with stable throughput.

Speed and Capacity:
- USB 2.0 full-speed interface (12 Mbps theoretical maximum).
- RS422/RS485 data rates typically up to 1 Mbps (depending on cable length and environment).

Efficiency:
- Low power consumption (400 mA typical).
- Efficient data buffering reduces CPU load on the host system.

Limitations:
- RS485 mode supports half-duplex communication only.
- Total current draw limited by USB port capacity in bus-powered mode.
- Requires external power for high-load or long-distance applications.

Reliability:
- Isolated design prevents ground loop interference.
- Metal enclosure enhances EMI protection and mechanical durability.
- LED indicators provide real-time operational feedback.

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### 8. Standards & Compliance

Electrical and Interface Standards:
- USB 2.0 Full-Speed (12 Mbps) compliant
- RS422 and RS485 EIA/TIA standards compliant
- Galvanic isolation between ports and USB interface

Regulatory Compliance:
- CE and FCC Class B (typical for industrial communication devices)
- RoHS compliant (lead-free manufacturing)

Industry Standards:
- Compatible with Modbus RTU, BACnet MS/TP, and other serial communication protocols
- Designed for industrial-grade reliability and safety

Chipset Compliance:
- MOSCHIP MCS7840 conforms to USB Implementers Forum (USB-IF) specifications
- Supports iSerial feature for consistent COM port mapping across USB ports

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### 9. Additional Information

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

Technical Support:
- Provided by Rayon Technology Co., Ltd. via email and phone.
- Driver downloads and documentation available on [www.rayontech.com](http://www.rayontech.com).

Maintenance:
- No routine maintenance required.
- Periodic inspection recommended for connectors and cables in industrial environments.
- Keep device free from dust and moisture for optimal performance.

Firmware & Driver Updates:
- Firmware updates provided by Rayon Technology as needed.
- Latest drivers for MCS7840 chipset available from MOSCHIP or Rayon’s support site.

Related and Compatible Models:
- UTS134: Non-isolated version (cost-effective model).
- UTS400: USB to four RS232 ports.
- UTS040: USB to four isolated RS232 ports.
- UTS485: USB to two RS232 and two isolated RS422/RS485 ports.
- UTS131-I / UTS132-I: Single and dual isolated RS422/RS485 converters.

Product Family Overview:
Rayon’s UTS series provides a comprehensive range of USB-to-serial converters covering RS232, RS422, and RS485 interfaces, with options for isolation, flexible configuration, and mixed-interface combinations. The UTS134-I represents the high-safety, four-port isolated RS422/RS485 model optimized for industrial and redundant communication systems.

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### Summary

The Rayon UTS134-I USB 2.0 to Isolated 4×RS485/422 Converter is a robust, industrial-grade communication interface device engineered for demanding serial networking environments. It combines four fully isolated RS422/RS485 ports, a reliable MOSCHIP MCS7840 controller, and flexible power options within a compact metal enclosure. Its design emphasizes electrical safety, data integrity, and ease of integration, making it ideal for automation, monitoring, and control applications requiring multiple isolated serial channels.

With features such as automatic RS485 data direction control, per-port LED indicators, and support for both bus-powered and self-powered operation, the UTS134-I delivers a versatile and dependable solution for extending serial connectivity through modern USB interfaces.

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Manufacturer: Rayon Technology Co., Ltd.
Model: UTS134-I
Product Type: USB 2.0 to Isolated 4-Port RS422/RS485 Converter
Power: 5VDC, 400mA (USB bus or external adapter)
Dimensions: 90 × 150 × 27 mm
Ports: 4 × DB9 male (RS422/RS485 selectable)
Isolation: Per-port ground isolation
Controller: MOSCHIP MCS7840
FIFO: 512 bytes per port
Operating Temperature: 0°C–55°C
Enclosure: Metal, industrial-grade

Ideal for: Industrial automation, SCADA, data acquisition, and redundant serial communication systems requiring high reliability and electrical isolation.