Comprehensive Product Summary – UTS114 USB 2.0 to 4-Port RS232/RS422/RS485 Converter

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### 1. Product Overview

Product Name: UTS114 USB to Serial Port Converter
Model: UTS114
Series: UTS Flexible Series (RS232/RS422/RS485 selectable models)
Article Number: UTS114
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
- Websites: [www.rayontech.com](http://www.rayontech.com), [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)

Product Description:
The Rayon UTS114 is a high-performance USB 2.0 to four-port RS232/RS422/RS485 converter designed for industrial, commercial, and system integration applications requiring multiple serial interfaces through a single USB connection. It integrates four independent serial channels within a compact, durable metal enclosure and supports flexible configuration of each port for RS232, RS422, or RS485 communication modes. The device is powered directly from the USB bus and utilizes the MOSCHIP MCS7840 controller for reliable, high-speed data transfer with 512-byte FIFO buffering per port.

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### 2. Key Features

- Four Independent Serial Ports: Supports four configurable serial channels (A, B, C, D) in one compact module.
- Multi-Protocol Support: Each port can be independently configured as RS232, RS422, or RS485 via DIP switch settings.
- USB 2.0 Interface: Compliant with USB 2.0 full-speed specifications, ensuring broad compatibility and plug-and-play operation.
- High-Performance Controller: Built around the MOSCHIP MCS7840 chipset, providing stable communication and advanced serial management.
- 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, simplifying RS485 network configuration.
- LED Indicators per Channel: Dedicated LEDs for power and transmit/receive activity on each port for easy status monitoring.
- Bus-Powered Operation: Draws power directly from the USB port (5VDC, 400mA), eliminating the need for an external power supply.
- Metal Enclosure: Provides electromagnetic shielding and mechanical durability for industrial environments.
- Compact Design: Space-efficient form factor (90 × 150 × 27 mm) suitable for desktop or embedded system integration.
- Flexible Configuration: DIP switch accessible on PCB for RS232/RS422/RS485 selection; default configuration is RS422/RS485.
- Hot-Pluggable USB Interface: Supports connection and disconnection without system reboot.
- iSerial Feature (MCS7840): Optional EEPROM-based unique serial number allows consistent COM port assignment across USB ports.
- Wide Environmental Tolerance: Operates reliably in temperature and humidity ranges suitable for industrial use.

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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: MOSCHIP MCS7840
- FIFO Buffer: 512 bytes per serial port
- Power Source: USB bus-powered (5VDC ±5%)
- Current Consumption: 400 mA typical

Serial Interface (RS232/RS422/RS485):
- Connector Type: DB9 male (x4)
- Number of Ports: 4 (A, B, C, D)
- Selectable Modes: RS232, RS422, RS485 (via DIP switch)
- Signal Pins (RS422/RS485): TX+, TX−, RX+, RX−, GND
- RS485 Auto Direction Control: Supported
- Default Configuration: RS422/RS485 mode
- RS232 Signal Pins: DCD, RXD, TXD, DTR, GND, DSR, RTS, CTS, RI

Pin Assignments (DB9 Connector):

| Pin | RS232 Signal | RS422/485 Signal | RS485 2-Wire Signal |
|-----|---------------|------------------|---------------------|
| 1 | DCD (In) | — | — |
| 2 | RXD (In) | RXD+ (In) | — |
| 3 | TXD (Out) | TXD+ (Out) | DATA+ (I/O) |
| 4 | DTR (Out) | TXD− (Out) | DATA− (I/O) |
| 5 | GND | GND | GND |
| 6 | DSR (In) | RXD− (In) | — |
| 7 | RTS (Out) | — | — |
| 8 | CTS (In) | — | — |
| 9 | RI (In) | — | — |

RS485 Mode Note:
Pins 2 and 3 are shorted as DATA+; pins 4 and 6 are shorted as DATA−.

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

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

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

The UTS114 functions as a USB-to-multi-serial converter, enabling a host computer to communicate with up to four serial devices simultaneously through a single USB interface. Each port can be independently configured for RS232, RS422, or RS485 communication, allowing integration with a wide range of industrial and commercial equipment such as PLCs, sensors, barcode scanners, POS terminals, and data acquisition systems.

Operation Overview:
1. The device connects to a host PC via a USB Type-B cable.
2. The MCS7840 controller enumerates as four virtual COM ports in the operating system.
3. Each port can be configured for the desired serial protocol using DIP switches.
4. Data transmission and reception are managed through the 512-byte FIFO buffer, ensuring smooth communication even under high data loads.
5. LED indicators provide real-time feedback on port activity and power status.

Use Cases and Applications:
- Industrial automation and control systems
- Point-of-sale (POS) terminals and kiosks
- Data acquisition and monitoring systems
- Serial device networking and remote control
- Laboratory instrumentation and test equipment
- Communication with legacy serial devices via modern USB interfaces

Compatibility:
- Compatible with Windows, Linux, and macOS operating systems supporting USB CDC or vendor-specific drivers.
- Backward compatible with USB 1.1 hosts.
- Supports hot-plugging and dynamic COM port assignment.

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### 5. Components & Accessories

Included Components:
- UTS114 converter unit (metal enclosure)
- USB Type-A to Type-B cable (standard length)
- User manual and driver CD (if applicable)

Optional Accessories:
- TB485: DB9 female to RS485 terminal block adapter kit for easy field wiring.
- Mounting brackets or DIN-rail adapters (optional, depending on installation environment).

Related Models (for scalability and customization):
- UTS134i: USB to four ground-isolated RS422/485 ports (safety model)
- UTS400: USB to four RS232 ports (cost-effective model)
- UTS040: USB to four isolated RS232 ports (safety model)
- UTS485: USB to two RS232 and two isolated RS422/485 ports

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### 6. Installation & Setup

Requirements:
- Host system with available USB 2.0 port
- Supported operating system with appropriate drivers installed
- USB cable (Type-A to Type-B)

Installation Steps:
1. Connect the UTS114 to the host computer using the supplied USB cable.
2. The operating system will detect the device and install the necessary drivers (or prompt for driver installation).
3. Verify that four virtual COM ports are created in the system’s device manager.
4. Configure each port’s communication parameters (baud rate, parity, stop bits, etc.) as required by the connected devices.
5. Use the DIP switch on the PCB to select RS232 or RS422/RS485 mode for each port:
- OFF position: RS232 mode
- ON position: RS422/RS485 mode
6. For RS485 operation, the Auto Data Direction Control feature automatically manages transmit/receive switching.
7. Connect serial devices to the DB9 connectors according to the pinout table.

Mounting Options:
- Desktop placement
- Wall or panel mounting (via optional brackets)
- DIN-rail mounting (with optional adapter)

Configuration Notes:
- Default DIP switch setting is RS422/RS485 (all switches ON).
- To change to RS232 mode, open the metal enclosure and adjust the DIP switch on the PCB.
- Each port can be configured independently.

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### 7. Performance & Capabilities

Data Throughput:
- High-speed USB 2.0 interface ensures efficient data transfer between host and serial devices.
- 512-byte FIFO per port minimizes data loss and ensures smooth communication under heavy load.

Speed and Capacity:
- Supports standard serial baud rates up to 921.6 kbps (depending on host and device capabilities).
- Four fully independent serial channels allow simultaneous communication with multiple devices.

Efficiency:
- Bus-powered design reduces cabling complexity and power supply requirements.
- Auto-direction control in RS485 mode eliminates the need for manual RTS signal handling.

Limitations:
- RS232/RS422/RS485 mode selection requires physical DIP switch adjustment (not software-configurable).
- No galvanic isolation between ports (for isolated models, see UTS134i or UTS040).

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### 8. Standards & Compliance

Compliance and Certifications:
- USB 2.0 Specification: Fully compliant
- EMC/EMI: Designed for industrial environments with metal shielding
- RoHS Compliance: Manufactured with lead-free components (where applicable)
- Safety: Meets general CE and FCC requirements for electronic communication devices

Industry Standards Supported:
- RS232 (EIA/TIA-232-F)
- RS422 (EIA/TIA-422-B)
- RS485 (EIA/TIA-485-A)

iSerial Feature (MCS7840/MCS7820):
- Supports EEPROM-based unique serial number assignment for consistent COM port mapping across USB ports.
- Prevents reassignment of COM numbers when connecting to different USB ports on the same host.
- Ideal for systems requiring fixed port identification in multi-port configurations.

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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 updates and documentation available on the official website.

Maintenance:
- No periodic maintenance required.
- Keep connectors clean and free from dust.
- Avoid exposure to excessive moisture or vibration.

Firmware & Driver Updates:
- Updated drivers and utilities available for download from Rayon’s website.
- Compatible with Windows (XP to Windows 11), Linux kernel 2.6+, and macOS (with appropriate drivers).

Product Family Overview:
The UTS114 belongs to Rayon’s “Flexible Model” series, offering configurable RS232/RS422/RS485 ports. It bridges the gap between cost-effective fixed-interface models (like UTS400) and safety-isolated models (like UTS134i). This flexibility makes it suitable for system integrators and OEMs requiring adaptable serial communication solutions.

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### Summary

The Rayon UTS114 USB 2.0 to 4-Port RS232/RS422/RS485 Converter is a robust, versatile communication interface designed for industrial and commercial applications requiring multiple serial connections through a single USB port. With its MOSCHIP MCS7840 controller, 512-byte FIFO buffering, and flexible DIP-switch configuration, it delivers reliable, high-speed serial communication across diverse environments. The metal enclosure ensures durability and EMI protection, while LED indicators provide clear operational feedback. Its bus-powered design, compact form factor, and multi-protocol support make it an ideal solution for engineers, system integrators, and OEMs seeking a dependable and adaptable USB-to-serial interface.