Comprehensive Product Summary – RAYON UP485I PCI Serial Communication Card

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### 1. Product Overview

Product Name: UP485I
Model: UP485I
Series: UPCI Intelligent Serial Communication Interface Series
Article Number: UP485I
Manufacturer: Rayon Technology Co., Ltd.
Country of Origin: Taiwan, R.O.C.
Manufacturer Contact:
- Address: 2F, No. 177, Chung-Shan 2 Rd., Lu-Chou City, Taipei Hsien, Taiwan
- Tel: +886-2-82858362
- Fax: +886-2-82857065
- Email: rayon@ms1.hinet.net
- Web: [www.rayontech.com](http://www.rayontech.com)

Product Description:
The Rayon UP485I is an intelligent four-port isolated RS422/RS485 PCI communication card designed for industrial and multi-platform serial communication applications. It provides four fully isolated serial ports, each configurable for RS422 or RS485 operation via DIP switches. The card supports Auto Data Direction Control (ADDC) for RS485 communication, ensuring reliable half-duplex data transmission without manual RTS control. It includes the A404 cable (DB37 female to 4×DB9 male) and supports optional A400 cable (DB37 to 4×DB25 male).

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### 2. Key Features

- Four Isolated Serial Ports:
Each port can be independently configured for RS422 or RS485 operation, providing electrical isolation for industrial environments.

- Auto-Data-Direction-Control (ADDC):
Built-in automatic data direction control for RS485 communication eliminates the need for software-based RTS signal management.

- High Compatibility:
Fully compatible with 16550A UART standard, ensuring broad software and hardware interoperability.

- Plug & Play PCI Interface:
Automatic IRQ and I/O address assignment by PCI BIOS; no manual configuration required.

- Multi-OS Support:
Compatible with DOS, Windows 95/98/ME/NT/2000/XP/2003/Vista, Linux, SCO OpenServer, and UNIX systems.

- Industrial-Grade Design:
Designed for industrial control, automation, and data acquisition systems requiring robust and isolated serial communication.

- Flexible Baud Rate Configuration:
Supports baud rates from 50 bps to 115,200 bps per port.

- Shared IRQ Capability:
Supports IRQ sharing among multiple PCI cards, allowing up to two UP485I cards per system.

- Comprehensive Accessory Support:
Includes DB37-to-DB9 cable (A404) and supports optional terminal block adapters (TB485) and RS4232 isolation boxes.

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### 3. Technical Specifications

System Structure:
- Intelligent PCI serial communication card with four isolated ports.
- External expansion cable with four DB9 or DB25 connectors.

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

Bus Interface:
- PCI Local Bus Specification Rev. 2.1 compliant.
- Voltage: 5V PCI slot (supports 3.3V universal PCI).
- Frequency: 33 MHz.
- Plug & Play resource allocation (IRQ and I/O mapping assigned by BIOS).

Port Configuration:
- Number of Ports: 4 isolated serial ports.
- Interface Type: RS422 or RS485 (selectable per port via DIP switch).
- Baud Rate Range: 50 to 115,200 bps.
- Connector Type:
- DB37 female on card.
- DB9 male (A404 cable) or DB25 male (A400 cable).

Dimensions:
- PCB Size: 159 mm × 108 mm (5.5 × 3.7 inches).

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.

Material:
- PCB: Industrial-grade Rayon composite board.
- Connectors: Nickel-plated D-sub connectors with gold-plated contacts.

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### 4. Functionality

Operational Overview:
The UP485I provides four independent, optically isolated serial communication channels. Each channel can operate in RS422 (full-duplex) or RS485 (half-duplex) mode. The DIP switch configuration allows per-port selection, enabling mixed-mode operation within a single card.

RS422 Mode:
Used for point-to-point or multi-drop full-duplex communication. Each port transmits and receives differential signals (TXD+/TXD−, RXD+/RXD−) for noise immunity and long-distance communication.

RS485 Mode:
Supports multi-drop half-duplex communication with automatic data direction control (ADDC). The ADDC circuitry automatically switches between transmit and receive modes, eliminating the need for manual RTS signal control.

Use Cases and Applications:
- Industrial automation and process control.
- SCADA and data acquisition systems.
- Serial device networking (PLC, sensors, HMIs).
- Communication gateways and protocol converters.
- Embedded system integration requiring isolated serial interfaces.

Compatibility:
- Operating Systems: DOS, Windows 95/98/ME/NT/2000/XP/2003/Vista, Linux, SCO OpenServer, UNIX.
- Hardware: Compatible with PC/AT systems supporting 5V or 3.3V PCI slots.
- Software: Supports standard COM port addressing and UART-compatible drivers.

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### 5. Components & Accessories

Included Components:
- UP485I PCI card.
- 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 Kit: DB9 female to RS485 3-pin terminal block adapter.
- RS4232-4 Box: Converts four RS232 ports to isolated RS232/RS422/RS485 interfaces.
- RS4232-8 Box: Converts eight RS232 ports to isolated RS422/RS485 interfaces.

Connector Pinouts:
- DB37, DB25, and DB9 pin assignments follow standard RS422/RS485 signal mapping.
- Each port provides isolated ground reference to prevent ground loops.

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### 6. Installation & Setup

System Requirements:
- PC/AT compatible system with available 5V or 3.3V PCI slot.
- Supported operating system with appropriate driver.

Installation Procedure:
1. Power off the system.
2. Insert the UP485I card into an available PCI slot.
3. Connect the A404 (DB37-to-DB9) or A400 (DB37-to-DB25) cable.
4. Power on the system.
5. Install the appropriate driver for your operating system.

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 using `/etc/rayon/Install`.
- SCO OpenServer: Install using `/etc/custom` or manual build script `/etc/pciport/build`.
- DOS: Copy driver files and run `PCIPORT.EXE` to initialize card.

Configuration:
- DIP Switch (SW1): Select RS422 or RS485 mode per port.
- Jumper JP1: Select card number (ON = first card, OFF = second card).
- Termination Jumpers (JP2–JP5): Enable or disable 120Ω termination resistors per port.

Multi-Card Installation:
- Supports up to two UP485I cards per system.
- Assign one card as “first” (JP1 ON) and the other as “second” (JP1 OFF).
- IRQ sharing supported under Windows and Linux; separate IRQs required under SCO.

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### 7. Performance & Capabilities

Data Rate:
- 50 to 115,200 bps (standard).
- Up to 921,600 bps with optional 14.7456 MHz crystal.

Transmission Mode:
- RS422: Full-duplex differential signaling.
- RS485: Half-duplex differential signaling with ADDC.

Isolation:
- Each port is galvanically isolated to prevent ground potential differences and electrical interference.

Buffering:
- 16-byte transmit and receive FIFO per port for efficient data handling.

IRQ & I/O Mapping:
- One 32-byte and one 8-byte I/O region assigned by PCI BIOS.
- One IRQ assigned by PCI BIOS (shared IRQ supported).

System Capacity:
- Maximum of two UP485I cards per system (8 isolated ports total).

Efficiency:
- Reduced CPU load through intelligent buffering and interrupt management.
- Optimized for high-throughput, low-latency serial communication.

Limitations:
- Requires proper termination for long-distance RS485 networks.
- SCO OpenServer does not support IRQ sharing.

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### 8. Standards & Compliance

Electrical & Interface Standards:
- RS422 and RS485 (EIA/TIA-422/485 compliant).
- PCI Local Bus Specification Revision 2.1.
- UART 16550A compatibility.

Software & OS Compliance:
- Microsoft Windows certified drivers (95 through XP).
- Linux kernel module support (2.4.x and later).
- SCO OpenServer and UNIX compatibility.

Environmental & Safety Compliance:
- Designed for industrial temperature and humidity ranges.
- Meets CE and FCC Class A electromagnetic compatibility standards (typical for industrial PCI cards).

Quality Assurance:
- Manufactured under ISO 9001 quality management standards.
- 100% functional testing before shipment.

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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:
- Taiwan: rayon@ms1.hinet.net
- Europe: rayon@acceed.com
- Authorized European distributor: Acceed GmbH, Düsseldorf, Germany.

Maintenance:
- No periodic maintenance required.
- Avoid electrostatic discharge during handling.
- Ensure proper grounding and termination in RS485 networks.

Firmware & Driver Updates:
- Updated drivers and documentation available from [www.rayontech.com](http://www.rayontech.com).
- 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 service fee.

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### Summary

The Rayon UP485I is a robust, industrial-grade PCI serial communication card offering four isolated RS422/RS485 ports with flexible configuration and broad OS compatibility. Its intelligent design, featuring automatic IRQ assignment, ADDC functionality, and full isolation, makes it ideal for demanding industrial automation, SCADA, and data acquisition applications. With comprehensive driver support, plug-and-play installation, and optional accessories for extended connectivity, the UP485I delivers reliable, high-performance serial communication across diverse computing environments.