Comprehensive Product Summary – Rayon Technology P134U Universal PCI 4-Port RS422/RS485 5V-Only Serial Communication Card

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### 1. Product Overview

Product Name: UPCI 4-Port RS422/RS485 5V Only Card
Model: P134U
Series: UPCI Intelligent Serial Communication Card Series
Article Number: P134U
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 P134U is a Universal PCI (UPCI) intelligent 4-port serial communication card designed for industrial and commercial applications requiring reliable RS422 and RS485 connectivity. It operates exclusively on a 5V power supply and supports both 3.3V and 5V PCI bus slots. The card provides four independent serial ports, each fully compatible with the 16550A UART standard, supporting data rates from 50 to 115,200 bps. It is engineered for plug-and-play operation with automatic IRQ and I/O mapping assigned by the PCI BIOS, ensuring seamless integration into modern and legacy systems.

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### 2. Key Features

- Universal PCI Compatibility: Supports both 3.3V and 5V PCI slots, ensuring broad compatibility with a wide range of motherboards and industrial PCs.
- 4-Port RS422/RS485 Interface: Provides four independent serial communication ports for industrial control, automation, and data acquisition systems.
- 16550A-Compatible UARTs: Each port includes a 16550A-compatible UART with 16-byte FIFO buffers, ensuring stable and efficient data transmission.
- High-Speed Communication: Supports baud rates from 50 bps up to 115,200 bps per port, suitable for high-performance serial communication tasks.
- Plug & Play Configuration: Automatic IRQ and I/O address assignment via PCI BIOS simplifies installation and configuration.
- Surge Protection: Integrated surge protection on TXD and RXD signal lines enhances reliability in electrically noisy environments.
- 5V Power Supply Operation: Designed for systems that provide only 5V power, ensuring compatibility with legacy industrial platforms.
- Flexible Connector Options: Includes a DB37 female to 4×DB9 male cable (DB25 male cable available upon request).
- Cross-Platform Driver Support: Compatible with multiple operating systems including DOS, Windows (95/98/Me/NT/2000/XP/Vista/7), Linux, SCO, and UNIX.
- Compact Design: Small form factor (120 mm × 100 mm) suitable for space-constrained enclosures.
- Industrial-Grade Build: Designed for continuous operation in demanding environments with wide temperature and humidity tolerance.

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### 3. Technical Specifications

Physical Characteristics:
- Card Dimensions: 120 mm (L) × 100 mm (W)
- Form Factor: Universal PCI (3.3V/5V, 33 MHz)
- Weight: Approx. 120 g (typical, excluding cable)
- Material: High-quality PCB with industrial-grade components

Electrical Characteristics:
- Bus Interface: PCI Local Bus Specification Rev. 2.2 compliant
- Bus Voltage: 3.3V and 5V signaling supported
- Power Requirement: 5V only (for RS422/RS485 operation)
- Clock Frequency: 1.8432 MHz UART clock

Serial Communication:
- Number of Ports: 4 independent serial ports
- Interface Standards: RS422 and RS485 (differential signaling)
- UART Type: 16550A compatible with programmable baud rate generator
- Baud Rate Range: 50 bps to 115,200 bps
- Signal Lines (RS422/RS485): TXD+, TXD−, RXD+, RXD−, RTS, CTS, DTR, DSR, DCD, GND
- Surge Protection: Integrated on TXD/RXD lines
- Connector Type:
- DB37 female on card
- DB9 male (via included cable)
- Optional DB25 male (on request)

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 P134U functions as a multi-port serial communication interface card that allows a host computer to connect to multiple RS422 or RS485 devices simultaneously. Each port operates independently, enabling concurrent data transmission and reception across all channels. The card’s intelligent design, featuring 16550A-compatible UARTs, ensures efficient buffering and minimizes CPU overhead during high-speed data transfers.

Use Cases and Applications:
- Industrial Automation: Connecting PLCs, sensors, and actuators in factory automation systems.
- Data Acquisition Systems: Interfacing with measurement instruments and data loggers.
- Building Management Systems: Communication with HVAC controllers, access control units, and monitoring devices.
- Point-of-Sale (POS) Systems: Integration with barcode scanners, receipt printers, and cash drawers.
- Networking and Communication: Linking RS485-based devices in distributed control networks.
- Embedded Systems: Providing serial connectivity for embedded controllers and single-board computers.

Compatibility:
The P134U is compatible with a wide range of operating systems and environments, including:
- DOS
- Windows 95/98/Me
- Windows NT
- Windows 2000/XP
- Windows Vista/7 (32-bit)
- Linux distributions
- SCO OpenServer
- UNIX-based systems

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### 5. Components & Accessories

Included Items:
- P134U PCI card (main board)
- DB37 female to 4×DB9 male connector cable (standard accessory)
- Driver and utility software (on CD or downloadable)
- Installation guide and documentation

Optional Accessories:
- DB37 female to 4×DB25 male connector cable (available upon request)
- Additional surge protection modules (optional external add-ons)
- Mounting brackets for industrial chassis integration

Connectors and Interfaces:
- On-Board Connector: DB37 female
- External Cable Connectors: 4×DB9 male (standard) or 4×DB25 male (optional)
- Signal Interface: RS422/RS485 differential pair lines

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### 6. Installation & Setup

System Requirements:
- Available PCI slot (3.3V or 5V, 33 MHz)
- Compatible operating system (Windows, Linux, DOS, or UNIX)
- Administrative privileges for driver installation

Installation Procedure:
1. Power off the host system and disconnect it from the power source.
2. Insert the P134U card into an available PCI slot, ensuring proper alignment.
3. Secure the card using the chassis screw or bracket.
4. Connect the provided DB37-to-DB9/DB25 cable to the card’s external connector.
5. Attach RS422/RS485 devices to the corresponding DB9/DB25 connectors.
6. Power on the system; the PCI BIOS will automatically assign IRQ and I/O addresses.
7. Install the appropriate driver software for the operating system.
8. Verify port recognition and configure communication parameters (baud rate, parity, stop bits) as required.

Configuration:
- IRQ & I/O Mapping: Automatically assigned by PCI BIOS (Plug & Play).
- Port Settings: Configurable through device manager or terminal software.
- Power Supply: Operates solely on 5V input; no external power required.

Mounting Options:
- Standard PCI slot installation in desktop or industrial PC chassis.
- Optional bracket kits for rackmount or embedded system integration.

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### 7. Performance & Capabilities

Data Throughput:
Each port supports full-duplex communication at speeds up to 115,200 bps, ensuring reliable data exchange even in high-traffic environments. The 16550A UART architecture with FIFO buffering minimizes data loss and CPU load during continuous transmission.

Capacity:
- Four independent serial channels per card.
- Multiple cards can be installed in a single system for expanded port capacity.

Efficiency:
- Hardware-based buffering reduces software overhead.
- Automatic resource allocation via PCI BIOS simplifies system configuration.
- Surge protection enhances long-term reliability and minimizes downtime.

Limitations:
- Operates exclusively on 5V power supply (not suitable for 3.3V-only systems).
- Maximum baud rate limited to 115,200 bps (not designed for ultra-high-speed serial applications).
- Requires external cable for port access (included).

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### 8. Standards & Compliance

Compliance and Certifications:
- PCI Local Bus Specification: Revision 2.2 compliant
- Electrical Standards: RS422 and RS485 EIA/TIA compliant
- EMC/EMI: Designed to meet industrial electromagnetic compatibility standards
- RoHS Compliance: Manufactured using lead-free and environmentally safe materials (where applicable)

Industry Standards Supported:
- UART 16550A compatibility
- EIA/TIA-422 and EIA/TIA-485 differential signaling standards
- Plug and Play (PnP) PCI resource management

Regulatory Conformance:
The P134U adheres to international standards for serial communication hardware and is suitable for use in regulated industrial and commercial environments.

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### 9. Additional Information

Warranty:
- Standard manufacturer’s warranty (typically 1 year, extendable upon request).
- Covers defects in materials and workmanship under normal operating conditions.

Technical Support:
- Email and telephone support provided by Rayon Technology.
- Online resources, including driver downloads and FAQs, available at [www.rayontech.com](http://www.rayontech.com).

Maintenance:
- Periodic inspection recommended to ensure connector integrity and cable condition.
- Keep card and connectors free from dust and moisture.
- Firmware and driver updates available through manufacturer’s website.

Product Line Context:
The P134U is part of Rayon’s 5V-only four-port PCI communication card family, offering various interface combinations:

| Model | RS232 Ports | RS422 Ports | RS485 Ports |
|--------|--------------|--------------|--------------|
| P5584U | 4 | 0 | 0 |
| P104UP | 4 | 0 | 4 |
| P134U | 0 | 4 | 4 |
| P114U | 4 | 4 | 4 |

This modular product line allows system integrators to select the optimal configuration for their specific communication requirements.

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### Summary

The Rayon P134U UPCI 4-Port RS422/RS485 5V-Only Card is a robust, industrial-grade serial communication solution designed for systems requiring multiple high-reliability serial interfaces. With its universal PCI compatibility, intelligent plug-and-play configuration, and support for both RS422 and RS485 standards, it provides exceptional flexibility for industrial automation, data acquisition, and embedded control applications. Its 16550A-compatible UARTs ensure stable, high-speed communication, while integrated surge protection and wide environmental tolerance make it suitable for demanding operational environments.

The P134U exemplifies Rayon Technology’s commitment to providing durable, high-performance communication hardware for professional and industrial users seeking dependable serial connectivity across diverse platforms and operating systems.