Comprehensive Product Summary – Rayon Technology P5288U Universal PCI 8-Port RS232/RS485 Card

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### 1. Product Overview

Product Name: UPCI 8-Port RS232/RS485 5V Only Card
Model Number: P5288U
Series: PCIPORT Universal PCI Serial Communication Card Series
Article Number: P5288U
Manufacturer: Rayon Technology Co., Ltd.
Manufacturer Address: 2F, No. 177, Chung-Shan 2 Rd., Lu-Chou City, Taipei Hsien, Taiwan, R.O.C.
Contact:
- Tel: +886-2-82858362
- Fax: +886-2-82857065
- Email: rayon@ms1.hinet.net
- Web: [www.rayontech.com](http://www.rayontech.com)

The Rayon P5288U is a high-performance, intelligent 8-port Universal PCI serial communication card designed for industrial and commercial applications requiring multiple RS232 or RS485 serial interfaces. It supports flexible configuration, allowing each port to be independently set to RS232 or RS485 mode. The card operates exclusively on a 5V PCI bus and is fully compatible with 33 MHz PCI systems.

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### 2. Key Features

- Eight Independent Serial Ports: Each port can be configured as RS232 or RS485, providing maximum flexibility for mixed communication environments.
- Universal PCI Interface: Supports both 5 V and 3.3 V PCI slots (33 MHz), ensuring compatibility with a wide range of motherboards.
- Auto Data Direction Control (ADDC): Built-in automatic data direction management for RS485 communication eliminates the need for manual RTS control.
- Plug & Play Configuration: IRQ and I/O address mapping are automatically assigned by the PCI BIOS, simplifying installation and avoiding resource conflicts.
- High-Speed Communication: Each port supports baud rates from 50 bps up to 115,200 bps (standard), with optional support up to 921.6 kbps using a 14.7456 MHz crystal.
- 16550A-Compatible UARTs: Each port uses a 16550A-compatible UART with 16-byte transmit and receive FIFOs for efficient data buffering and reduced CPU load.
- Operating System Support: Compatible with DOS, Windows 95/98/ME/NT/2000/XP/2003/Vista, Linux, and SCO OpenServer.
- Multi-Card Support: Up to two P5288U cards can be installed in a single system, providing up to 16 serial ports.
- Comprehensive Driver Package: Includes drivers and installation utilities for multiple operating systems, with detailed configuration options for COM port numbering and IRQ sharing.
- Industrial-Grade Reliability: Designed for continuous operation in demanding environments, with wide temperature and humidity tolerance.

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### 3. Technical Specifications

System Architecture:
- Intelligent PCI multi-port serial controller card
- External expansion cable with eight DB25 or DB9 connectors

Serial Communication Controller:
- Type: 16550A-compatible UART
- Clock Frequency: 1.8432 MHz (standard)
- FIFO: 16-byte transmit and receive buffers

Interface Standards:
- RS232C and RS485 (individually selectable per port)
- Auto Data Direction Control for RS485

Baud Rate:
- 50 bps to 115,200 bps (standard)
- Up to 921.6 kbps with optional 14.7456 MHz crystal

Connectors:
- DB62 male connector on card
- Expansion cable to 8 × DB9 male (R804) or 8 × DB25 male (R801)
- Optional DB25 female cable (R802)
- Optional RS485 terminal block adapter (TB485)

Bus Interface:
- PCI Local Bus Specification Rev. 2.1 compliant
- 33 MHz, 32-bit PCI bus
- 5 V signaling (universal card supports 3.3 V slots)

I/O and IRQ Mapping:
- One 64-byte and one 8-byte I/O region assigned by PCI BIOS
- Single IRQ assigned by PCI BIOS (IRQ shareable)

Power Requirements:
- 5 V DC from PCI slot (no external power required)

Physical Dimensions:
- Card size: 6.0 in × 4.2 in (152 mm × 107 mm)

Environmental Conditions:
- Operating Temperature: 0 °C – 55 °C
- Storage Temperature: 0 °C – 65 °C
- Operating Humidity: 10 % – 95 % RH (non-condensing)
- Storage Humidity: 5 % – 95 % RH

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### 4. Functionality

The P5288U provides eight independent serial communication channels that can be configured as RS232 or RS485. Each port operates independently, allowing simultaneous communication with local RS232 devices (e.g., modems, terminals, barcode scanners) and remote RS485 devices (e.g., PLCs, sensors, industrial controllers).

RS232 Mode:
- Standard asynchronous serial communication for point-to-point connections.
- Supports full modem control signals (RTS, CTS, DTR, DSR, DCD).

RS485 Mode:
- Differential signaling for long-distance, multi-drop communication.
- Supports half-duplex operation with automatic data direction control.
- Each RS485 port can connect to one or multiple devices (multi-drop requires appropriate software protocol).

Use Cases:
- Industrial automation and process control
- Data acquisition and monitoring systems
- POS and kiosk systems
- SCADA and building management systems
- Laboratory instrumentation and test equipment

Compatibility:
- Fully compatible with standard serial communication software and APIs.
- Supports up to two cards per system (16 ports total).

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### 5. Components & Accessories

Included Components:
- One P5288U PCI interface card
- One DB62-to-8×DB9 male cable (R804)
- User manual and driver diskette

Optional Accessories:
- R801 cable: DB62 to 8×DB25 male connectors
- R802 cable: DB62 to 8×DB25 female connectors
- R803 cable: DB62 male-to-DB62 male cable for connection to RS4232-8 isolation box
- RS4232-8 box: 8-port isolated RS232/RS422/RS485 converter box
- TB485: DB9 female to RS485 terminal block adapter

Connector Pinouts:
- DB62 pin assignments support eight channels of TXD, RXD, RTS, CTS, DTR, DSR, and DCD signals.
- DB9 and DB25 connectors follow standard RS232/RS485 pin definitions.

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### 6. Installation & Setup

System Requirements:
- PC/AT compatible system with available 5 V or 3.3 V PCI slot (33 MHz)
- Supported operating system (DOS, Windows, Linux, or SCO)

Installation Procedure:
1. Power off the system and remove the cover.
2. Insert the P5288U card into an available PCI slot.
3. Connect the DB62 expansion cable to the card.
4. Attach the external DB9 or DB25 connectors to your serial devices.
5. Power on the system.
6. Install the appropriate driver for your operating system.

Jumper Configuration:
- JP1: Card number selection (ON = first card, OFF = second card).
- Allows consistent COM port numbering across reboots and multi-card setups.

Driver Installation:
- Windows 95/98/ME/2000/XP/Vista/7: Plug & Play detection; specify driver path (A:\WIN2000 or equivalent).
- Windows NT4: Manual installation via Control Panel → Network → Add Adapter → “Other.”
- DOS: Run `PCIPORT.EXE` from the driver diskette.
- Linux: Install via provided source package (`/etc/rayon/Install`), rebuild kernel module, and reboot.
- SCO OpenServer: Install using `/etc/custom` or manual `tar` and `build` commands.

Multi-Card Installation:
- Up to two cards per system.
- Assign one card as “first” (JP1 ON) and the other as “second” (JP1 OFF).
- IRQ sharing supported under Windows and Linux; SCO requires unique IRQs.

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### 7. Performance & Capabilities

Data Throughput:
- Up to 115.2 kbps per port (standard)
- Optional high-speed operation up to 921.6 kbps with upgraded crystal

Buffering:
- 16-byte transmit and receive FIFOs per port reduce CPU overhead and improve throughput.

IRQ Sharing:
- Fully PCI Plug & Play compliant; supports IRQ sharing across multiple PCI devices.

Capacity:
- 8 ports per card, 2 cards per system (16 ports total).

Efficiency:
- Intelligent buffering and automatic flow control minimize CPU interrupts.
- Supports both hardware (RTS/CTS) and software (XON/XOFF) flow control.

Limitations:
- RS485 multi-drop operation requires appropriate master/slave protocol in software.
- Maximum of two cards per system due to IRQ and I/O mapping constraints.

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### 8. Standards & Compliance

- PCI Local Bus Specification: Revision 2.1 compliant
- UART Compatibility: 16550A standard
- Electrical Interface: EIA/TIA RS232C and RS485 standards
- Operating Systems: Certified drivers for DOS, Windows NT/2000/XP/Vista/7, Linux, SCO OpenServer
- Environmental Compliance: Designed for industrial temperature and humidity ranges
- EMC and Safety: Meets general PC peripheral standards (FCC Class A equivalent)

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### 9. Additional Information

Warranty:
- One-year limited warranty covering defects in materials and workmanship.
- Excludes damage from misuse, electrical surges, or unauthorized modification.

Support & Service:
- Technical support available via email (rayon@ms1.hinet.net) or through European distributor Acceed GmbH (rayon@acceed.com).
- RMA (Return Material Authorization) required for warranty service.
- Repair services available for out-of-warranty products at a flat-rate charge.

Maintenance:
- No periodic maintenance required.
- Avoid electrostatic discharge during handling.
- Ensure proper grounding and cable shielding in RS485 installations.

Software Updates:
- Updated drivers and documentation available from [www.rayontech.com](http://www.rayontech.com).
- Linux driver source code provided for kernel integration.

Related Models in 5 V-Only 8-Port Series:
| Model | RS232 | RS422 | RS485 |
|--------|--------|--------|--------|
| P5188U | 8 | 8 | 0 |
| P5288U | 8 | 0 | 8 |
| P5388U | 0 | 8 | 8 |
| P5488U | 8 | 4 | 4 |
| P5588U | 8 | 0 | 0 |
| P5688U | 8 | 6 | 2 |
| P5788U | 8 | 7 | 1 |
| P5888U | 4 | 4 | 8 |
| P5988U | 4 | 8 | 4 |

Distributor Information:
- Acceed GmbH (Europe)
Arnoldstraße 19, 40479 Düsseldorf, Germany
Tel/Fax: +49 211 938898 0
Email: rayon@acceed.com
Web: [www.acceed.com/rayon](http://www.acceed.com/rayon)

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### Summary

The Rayon P5288U Universal PCI 8-Port RS232/RS485 Card is a robust, industrial-grade communication interface designed for systems requiring multiple serial connections. Its universal PCI compatibility, independent port configuration, and comprehensive driver support make it ideal for automation, data acquisition, and control applications. With automatic resource assignment, high-speed UARTs, and flexible RS232/RS485 operation, the P5288U delivers reliable, efficient, and scalable serial communication for modern PC-based systems.