Comprehensive Product Summary – Rayon Technology P5985 UPCI 4-Port RS422/485 PCI Card (incl. Cable A404)

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### 1. Product Overview

Product Name: UPCI 4-Port RS422/485 PCI Communication Card
Model Number: P5985
Series: PCIPORT Intelligent Serial Communication Series
Article Number: P5985
Manufacturer: Rayon Technology Co., Ltd.
Country of Origin: Taiwan, R.O.C.
Manufacturer Contact:
- Address: 2F, No. 177, Chung-Shan 2 Road, Lu-Chou City, Taipei Hsien, Taiwan
- Tel: +886-2-82858362
- Fax: +886-2-82857065
- Email: rayon@ms1.hinet.net / info@rayontech.com.tw
- Web: [www.rayontech.com.tw](http://www.rayontech.com.tw)

Product Description:
The Rayon P5985 is an intelligent 4-port RS422/RS485 serial communication card designed for PCI bus systems. It provides four independent, DIP-switch-selectable serial ports supporting RS422 or RS485 modes, with Auto Data Direction Control (ADDC) for RS485 operation. The card is fully plug-and-play compliant, automatically configured by the PCI BIOS, and supports both 3.3V and 5V 33MHz PCI slots. It includes the A404 cable (DB37 female to 4×DB9 male) for external connectivity.

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### 2. Key Features

- Four Independent Serial Ports: Each port can be configured individually for RS422 or RS485 operation.
- Auto Data Direction Control (ADDC): Automatic control of data direction in RS485 mode eliminates the need for manual RTS signal handling.
- High Compatibility: Fully compatible with 16550A UART standard, ensuring broad software and hardware support.
- Plug & Play PCI Interface: Automatic IRQ and I/O address assignment by PCI BIOS; no manual configuration required.
- Flexible Power Support: Operates on standard 5V PCI bus power; compatible with both 3.3V and 5V PCI slots.
- High-Speed Communication: Supports baud rates from 50 to 115,200 bps per port.
- Multi-OS Support: Compatible with DOS, Windows 95/98/Me/NT/2000/XP/7/8/10, Linux, and SCO OpenServer.
- Compact Design: Small form factor (122 × 101 mm) suitable for standard PC enclosures.
- Expandable System: Supports installation of up to two cards per system (total of 8 serial ports).
- Comprehensive Accessory Set: Includes DB37-to-4×DB9 cable (A404); optional DB37-to-4×DB25 cable (A400) available.
- Industrial Reliability: Designed for continuous operation in industrial and automation environments.

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### 3. Technical Specifications

System Architecture:
- Intelligent PCI serial communication controller card
- External expansion cable with four standard DB9 or DB25 connectors

Serial Controller:
- Type: 16550A-compatible UART
- Clock Frequency: 1.8432 MHz (supports up to 14.7456 MHz for higher baud rates)
- FIFO Buffer: 16-byte transmit and receive buffers per port

Interface & Ports:
- Number of Ports: 4
- Interface Type: RS422 or RS485 (individually selectable)
- Connector Type: DB37 female on card; DB9 male (A404 cable) or DB25 male (A400 cable)
- Baud Rate: 50 to 115,200 bps (software programmable)
- Signal Support: TXD±, RXD±, RTS, CTS, DTR, DSR, DCD, GND

Bus Interface:
- PCI Local Bus Specification: Rev. 2.1 compliant
- Bus Type: 32-bit PCI, 33 MHz
- Voltage: 3.3V and 5V compatible
- IRQ: One sharable IRQ assigned by PCI BIOS
- I/O Mapping: 32-byte + 8-byte I/O space assigned automatically

Physical Characteristics:
- Dimensions: 122 mm × 101 mm (approx. 12.0 × 10.0 cm)
- Weight: Approx. 120 g (card only)
- Material: Multi-layer PCB with gold-plated edge connector

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

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### 4. Functionality

Operational Overview:
The P5985 card provides four independent serial communication channels that can be configured as RS422 or RS485 interfaces. Each port operates asynchronously and supports full-duplex (RS422) or half-duplex (RS485) communication. The Auto Data Direction Control (ADDC) feature automatically manages the transmit/receive switching in RS485 mode, ensuring efficient half-duplex communication without software intervention.

Use Cases & Applications:
- Industrial automation and process control systems
- Data acquisition and instrumentation
- Building management and SCADA systems
- Serial device networking (PLC, sensors, controllers)
- Communication with RS422/RS485-based equipment
- Multi-drop serial bus environments

Compatibility:
- PCI-based PC/AT systems
- Supports up to two P5985 cards per system (8 ports total)
- Compatible with standard serial communication software and drivers

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### 5. Components & Accessories

Included in Package:
- 1 × P5985 PCI serial card
- 1 × A404 cable (DB37 female to 4 × DB9 male connectors)
- User manual and driver diskette

Optional Accessories:
- A400 cable (DB37 female to 4 × DB25 male connectors)
- TB485 terminal block adapter (DB9 female to RS485 terminal block)
- RS4232-4 isolation box (for RS232/RS422/RS485 signal isolation)
- A640 cable (DB37 male-to-female extension cable for RS4232-4 box connection)

Connector Pinouts:
- DB37 female connector on card supports four ports (A–D)
- DB9/DB25 pin assignments follow standard RS422/RS485 signal mapping

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### 6. Installation & Setup

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

Installation Procedure:
1. Power off the PC and open the chassis.
2. Insert the P5985 card into an available PCI slot.
3. Connect the A404 (DB37-to-DB9) cable to the card’s DB37 connector.
4. Power on the system; the PCI BIOS will automatically detect and assign resources.
5. Install the appropriate driver for your operating system.
6. Configure port parameters (COM number, baud rate, parity, etc.) via driver settings.

Jumper Configuration:
- JP1: Card number selection (ON = first card, OFF = second card)
- DIP Switch: Per-port interface selection (RS422 or RS485)

Mounting Options:
- Standard PCI slot installation
- External cable routing through rear I/O bracket

Driver Installation:
- Windows 95/98/Me: Plug & Play detection; specify driver path (A:\WIN95)
- Windows NT4: Manual installation via Control Panel → Network → Add Adapter → Specify path (A:\P584\NT4)
- Windows 2000/XP: Automatic detection; specify driver path (A:\WIN2000)
- Linux: Install via provided source package; rebuild kernel module
- SCO OpenServer: Install using `/etc/custom` or manual build procedure

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### 7. Performance & Capabilities

Communication Performance:
- Baud Rate Range: 50 to 115,200 bps (standard); up to 921.6 kbps with 14.7456 MHz crystal
- Data Bits: 5, 6, 7, or 8
- Stop Bits: 1 or 2
- Parity: None, Even, Odd
- Flow Control: XON/XOFF (software) or RTS/CTS (hardware)
- FIFO Buffer: 16-byte transmit and receive per port

Electrical Characteristics:
- RS422: Differential full-duplex communication
- RS485: Differential half-duplex communication with ADDC
- Termination: Optional 120 Ω termination resistors (jumper selectable)
- Isolation: Optional via external RS4232-4 box

System Capacity:
- Maximum Cards per System: 2 (8 ports total)
- IRQ Sharing: Supported (PCI BIOS assigned)
- I/O Mapping: Automatic, six 8-byte I/O blocks assigned by BIOS

Limitations:
- Requires available IRQ for Plug & Play operation
- RS485 mode supports half-duplex only
- Not compatible with ISA-only systems

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### 8. Standards & Compliance

Bus & Interface Standards:
- PCI Local Bus Specification Revision 2.1
- RS422 and RS485 Electrical Interface Standards (TIA/EIA-422-B, TIA/EIA-485-A)
- UART Compatibility: 16550A standard

Software & OS Compliance:
- Microsoft Windows (DOS, 95/98/Me/NT/2000/XP/7/8/10)
- Linux kernel 2.4.x and later (source driver provided)
- SCO OpenServer
- UNIX-compatible systems

Regulatory & Quality Compliance:
- CE and FCC Class A (industrial environment)
- RoHS-compliant manufacturing process
- ISO 9001-certified production facility

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### 9. Additional Information

Warranty:
- Standard 1-year limited warranty covering defects in materials and workmanship.
- Excludes damage due to misuse, electrical surges, or unauthorized modifications.

Support & Service:
- Technical Support (Europe): Acceed GmbH, Düsseldorf, Germany
- Tel: +49 211 938898 0
- Email: rayon@acceed.com
- Web: [www.acceed.com/rayon](http://www.acceed.com/rayon)
- Technical Support (Taiwan): Rayon Technology Co., Ltd.
- Email: rayon@ms1.hinet.net

Maintenance:
- Periodic inspection of connectors and cables recommended.
- Avoid electrostatic discharge during handling.
- Store in anti-static packaging when not in use.

Firmware & Driver Updates:
- Updated drivers available from Rayon’s website or authorized distributors.
- Linux driver source code provided for kernel integration.

Repair & RMA Procedure:
- Obtain RMA number before returning defective units.
- Provide model number, serial number, and failure description.
- Warranty repairs are free of charge; out-of-warranty repairs subject to flat-rate fee.

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### Summary

The Rayon P5985 UPCI 4-Port RS422/485 PCI Card is a robust, industrial-grade communication interface designed for multi-port serial connectivity in PC-based control and automation systems. With four independently configurable RS422/RS485 ports, automatic data direction control, and full plug-and-play PCI compliance, it offers a reliable and flexible solution for integrating serial devices into modern computing environments. Its broad operating system support, high-speed communication capability, and modular accessory options make it ideal for industrial automation, data acquisition, and embedded communication applications requiring stable, high-performance serial networking.