Comprehensive Product Summary – UTS022 USB 2.0 to Isolated 2×RS232 + 2×RS485/422 Converter

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### 1. Product Overview

Product Name: USB 2.0 to Isolated 2×RS232 + 2×RS485/422 Converter
Model: UTS022
Series: UTS400 Series – USB to Serial Port Converter Family
Article Number: UTS022
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 UTS022 is a high-performance USB 2.0 to multi-serial converter designed to provide two isolated RS232 ports and two isolated RS422/RS485 ports within a single compact, metal-encased module. It is part of the UTS400 series, which offers flexible, isolated, and multi-interface serial communication solutions for industrial, laboratory, and commercial applications. The UTS022 integrates the MOSCHIP MCS7840 USB-to-serial controller, providing robust data handling with 512-byte FIFO per port, LED indicators for each channel, and full electrical isolation for enhanced safety and signal integrity.

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### 2. Key Features

- Multi-Port Design: Supports four independent serial ports in one enclosure—two isolated RS232 ports and two isolated RS422/RS485 ports.
- USB 2.0 Interface: Fully compliant with USB 2.0 specifications, ensuring high-speed data transfer and backward compatibility with USB 1.1.
- Isolation Protection: Each serial channel is galvanically isolated to prevent ground loops and protect connected equipment from electrical surges.
- MOSCHIP MCS7840 Controller: Utilizes a reliable USB-to-serial bridge chip with integrated 512-byte FIFO buffers per port for efficient data flow and reduced latency.
- Auto Data Direction Control (RS485): Automatically manages data direction in RS485 mode, eliminating the need for manual RTS control.
- Flexible Interface Configuration: RS422 or RS485 mode selectable via DIP switch, allowing adaptation to various communication standards.
- LED Indicators: Individual TX/RX activity LEDs for each port (ATRD, BTRD, CTRD, DTRD) plus a power indicator (PWR) for easy status monitoring.
- Bus-Powered Operation: Draws power directly from the USB bus (5VDC, 400mA), eliminating the need for an external power supply.
- Optional Self-Powered Version: Available as model UTS400S for applications requiring external 5VDC power input.
- Compact Metal Enclosure: Durable, EMI-shielded metal housing measuring 90 × 150 × 27 mm, suitable for industrial environments.
- Hot-Pluggable USB Interface: Supports plug-and-play installation and hot-swapping without system reboot.
- iSerial Feature Support: When programmed with a unique EEPROM serial number, the MCS7840 retains consistent COM port assignments across USB ports.
- Wide Environmental Tolerance: Operates reliably in 0–55°C and 10–95% RH environments.

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### 3. Technical Specifications

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

Electrical Characteristics:
- Power Input: 5VDC via USB bus
- Current Consumption: 400 mA (typical)
- Optional Power Mode: Self-powered version (UTS400S) supports external 5VDC adapter input

USB Interface:
- Connector Type: USB Type-B female
- Standard Compliance: USB 2.0 (Full-Speed, 12 Mbps)
- Controller IC: MOSCHIP MCS7840
- FIFO Buffer: 512 bytes per serial port
- Hot-Plug Support: Yes
- iSerial EEPROM Support: Yes (optional unique serial number for consistent COM port mapping)

Serial Port Interface:
- Connector Type: DB9 male (per port)
- Number of Ports: 4 total (2 isolated RS232 + 2 isolated RS422/RS485)
- Isolation: Galvanic isolation between ports and USB interface
- Signal Pins (RS422/RS485): TX+, TX−, RX+, RX−, isolated GND
- RS485 Auto Direction Control: Supported (TX+/RX+ shorted as DATA+, TX−/RX− shorted as DATA−)
- Interface Selection: RS422 or RS485 selectable via DIP switch
- Signal Indicators: LED per port for 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)

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### 4. Functionality

The UTS022 functions as a USB-to-multi-serial converter, enabling a host computer to communicate with multiple serial devices through a single USB connection. It converts USB 2.0 signals into isolated RS232 and RS422/RS485 serial interfaces, allowing simultaneous operation of up to four independent serial channels.

Operation Principle:
- The MOSCHIP MCS7840 controller manages USB communication and serial data conversion.
- Each serial port operates independently with its own FIFO buffer, ensuring smooth data flow even under high traffic.
- In RS485 mode, the converter automatically controls data direction, simplifying half-duplex communication.
- The galvanic isolation between ports and the USB interface prevents ground potential differences and protects against electrical interference.

Typical Use Cases:
- Industrial automation and control systems
- Data acquisition and monitoring equipment
- POS (Point-of-Sale) terminals and barcode readers
- Laboratory instrumentation and test setups
- SCADA and telemetry systems
- Communication gateways between legacy serial devices and modern PCs or embedded systems

Compatibility:
- Compatible with Windows, Linux, and other operating systems supporting USB CDC or vendor-specific drivers for MCS7840.
- Works with standard serial communication software and terminal emulators.
- Supports hot-plugging and automatic COM port assignment.

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### 5. Components & Accessories

Included Items:
- UTS022 converter unit (metal enclosure)
- USB cable (Model U101): 6-foot USB Type-A to Type-B cable
- User documentation and driver support (available from manufacturer website)

Optional Accessories:
- External 5VDC power adapter (for self-powered variant UTS400S)
- Mounting brackets or DIN-rail adapters (optional, depending on installation environment)
- Replacement USB cables or DB9 serial cables

Connectors:
- USB Port: Type-B female (host connection)
- Serial Ports: Four DB9 male connectors (two for RS232, two for RS422/RS485)
- LED Indicators:
- PWR – Power ON indicator
- ATRD – RS232 Port A TX/RX activity
- BTRD – RS232 Port B TX/RX activity
- CTRD – RS422/RS485 Port C TX/RX activity
- DTRD – RS422/RS485 Port D TX/RX activity

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### 6. Installation & Setup

System Requirements:
- Available USB 2.0 or higher port on host computer
- Supported operating system (Windows, Linux, or equivalent)
- Driver installation (MCS7840 driver package from Rayon or MOSCHIP)

Installation Steps:
1. Connect the UTS022 to the host computer using the supplied USB cable.
2. The system detects the device and prompts for driver installation.
3. Install the appropriate driver for the MCS7840 chipset.
4. Once installed, the system assigns COM port numbers to each serial channel.
5. Connect serial devices to the DB9 ports as required.
6. Configure RS422/RS485 mode using the DIP switch located inside the enclosure if necessary.
7. Verify operation using LED indicators and communication software.

Mounting Options:
- Desktop placement (default)
- Optional wall or DIN-rail mounting (with accessories)

Configuration:
- DIP switch allows selection between RS422 and RS485 modes for the isolated ports.
- RS485 mode automatically manages data direction (no manual RTS control required).
- iSerial EEPROM configuration (optional) ensures consistent COM port numbering across USB ports.

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### 7. Performance & Capabilities

Data Throughput:
- USB 2.0 Full-Speed (12 Mbps) interface ensures sufficient bandwidth for four simultaneous serial channels.
- Each serial port supports standard baud rates up to 921.6 kbps (depending on driver and OS support).

Buffering:
- 512-byte FIFO per port minimizes data loss and ensures stable communication under high load.

Isolation & Protection:
- Electrical isolation between USB and serial ports prevents ground loops and protects connected devices from voltage surges.
- Metal enclosure provides EMI shielding and mechanical durability.

Efficiency:
- Bus-powered operation reduces cabling complexity and power supply requirements.
- Auto-direction control in RS485 mode optimizes half-duplex communication efficiency.

Limitations:
- Total current draw limited to 400 mA from USB bus; external power may be required for high-load applications.
- DIP switch access requires opening the enclosure for configuration changes.
- RS422/RS485 ports share configuration; cannot operate simultaneously in both modes on the same port.

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### 8. Standards & Compliance

USB Compliance:
- Fully compliant with USB 2.0 specification (Full-Speed mode).
- Backward compatible with USB 1.1 hosts.

Serial Communication Standards:
- RS232 (EIA/TIA-232)
- RS422 (EIA/TIA-422)
- RS485 (EIA/TIA-485)

Electrical Isolation:
- Meets industrial isolation standards for signal and ground separation between ports and host interface.

Regulatory Compliance:
- Designed to meet CE and FCC Class B requirements (typical for Rayon products).
- RoHS compliant (lead-free manufacturing).

Industry Standards:
- Compatible with standard serial communication protocols and industrial automation interfaces.
- Supports iSerial feature per MOSCHIP MCS7840 specification for consistent COM port mapping.

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year, subject to regional terms).

Technical Support:
- Provided by RAYON TECHNOLOGY CO., LTD. via email and website resources.
- Driver downloads, firmware updates, and documentation available online.

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

Firmware & Driver Updates:
- MCS7840 driver updates available from MOSCHIP or Rayon’s support portal.
- EEPROM programming for iSerial feature can be customized upon request.

Product Family Context:
The UTS022 belongs to the “Powerful Model” category within Rayon’s USB-to-Serial product lineup, offering a combination of isolated RS232 and RS422/RS485 interfaces. Other related models include:
- UTS485: 2×RS232 + 2×Isolated RS422/RS485
- UTS040: 4×Isolated RS232
- UTS004: 4×Isolated RS422/RS485
- UTS114: 4×Flexible RS232/RS422/RS485 configurable ports

Ordering Information:
- Model: UTS022
- Description: USB 2.0 to Isolated 2×RS232 + 2×RS422/RS485 Converter
- Included Cable: U101 (USB A–B, 6 ft)
- Optional Variant: UTS400S (self-powered version)

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### Summary

The RAYON UTS022 is a robust, industrial-grade USB-to-serial converter that integrates two isolated RS232 and two isolated RS422/RS485 ports into a single, compact, and durable metal enclosure. Powered by the MOSCHIP MCS7840 controller, it delivers reliable, high-speed serial communication with advanced features such as 512-byte FIFO buffering, automatic RS485 direction control, and per-port LED indicators. Its galvanic isolation ensures electrical safety and signal integrity, making it ideal for demanding industrial, laboratory, and automation environments. With flexible configuration options, plug-and-play USB connectivity, and support for the iSerial feature, the UTS022 provides a versatile and dependable solution for expanding serial communication capabilities on modern computing platforms.