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- Four Independent RS232 Serial Ports:
Provides four asynchronous serial communication channels via ISA bus interface.
- 16550A UART Compatibility:
Each port uses a 16550A‑compatible UART with 16‑byte transmit and receive FIFOs, ensuring efficient buffered communication and reduced CPU overhead.
- High‑Speed Data Transmission:
Supports baud rates from 50 bps up to 115,200 bps, software‑selectable per port.
- Plug‑and‑Play ISA Interface:
Designed for standard ISA bus systems, allowing easy integration into legacy PC/AT architectures.
- Flexible Connector Options:
Includes a DB37 female connector on the card with a breakout cable to four DB9 male connectors (or optional four DB25 male connectors on request).
- Multi‑Operating System Support:
Compatible with DOS, Windows 95/98/ME/NT/2000/XP, Linux, and SCO OpenServer.
- Dual‑Card System Support:
Up to two A402 cards per system, enabling up to eight serial ports in a single PC.
- Robust Design for Industrial and Embedded Use:
Engineered for reliability in industrial automation, instrumentation, and communication control systems.
- Flow Control Options:
Supports both hardware (RTS/CTS) and software (XON/XOFF) flow control mechanisms.
- Comprehensive Driver Package:
Includes drivers and installation utilities for multiple operating systems, ensuring broad compatibility and ease of deployment.
Provides four asynchronous serial communication channels via ISA bus interface.
- 16550A UART Compatibility:
Each port uses a 16550A‑compatible UART with 16‑byte transmit and receive FIFOs, ensuring efficient buffered communication and reduced CPU overhead.
- High‑Speed Data Transmission:
Supports baud rates from 50 bps up to 115,200 bps, software‑selectable per port.
- Plug‑and‑Play ISA Interface:
Designed for standard ISA bus systems, allowing easy integration into legacy PC/AT architectures.
- Flexible Connector Options:
Includes a DB37 female connector on the card with a breakout cable to four DB9 male connectors (or optional four DB25 male connectors on request).
- Multi‑Operating System Support:
Compatible with DOS, Windows 95/98/ME/NT/2000/XP, Linux, and SCO OpenServer.
- Dual‑Card System Support:
Up to two A402 cards per system, enabling up to eight serial ports in a single PC.
- Robust Design for Industrial and Embedded Use:
Engineered for reliability in industrial automation, instrumentation, and communication control systems.
- Flow Control Options:
Supports both hardware (RTS/CTS) and software (XON/XOFF) flow control mechanisms.
- Comprehensive Driver Package:
Includes drivers and installation utilities for multiple operating systems, ensuring broad compatibility and ease of deployment.
Comprehensive Product Summary – Rayon Technology A402 4‑Port RS232 ISA Card
### 1. Product Overview
Product Name: 4‑Port RS232 ISA Card
Model: A402
Series: ISA Serial Communication Interface Series
Article Number: A402
Manufacturer: Rayon Technology Inc.
Brand: RAYON
Country of Origin: Taiwan, R.O.C.
Manufacturer Contact:
- Rayon Technology Co., Ltd.
2F, No. 177, Chung‑Shan 2 Road, Lu‑Chou City, Taipei Hsien, Taiwan R.O.C.
Tel: +886‑2‑82858362 | Fax: +886‑2‑82857065 | Email: rayon@ms1.hinet.net
- European Support (Acceed GmbH)
Arnoldstraße 19, 40479 Düsseldorf, Germany
Tel/Fax: +49‑211‑938898‑0 | Email: rayon@acceed.com
### 2. Key Features
- Four Independent RS232 Serial Ports:
Provides four asynchronous serial communication channels via ISA bus interface.
- 16550A UART Compatibility:
Each port uses a 16550A‑compatible UART with 16‑byte transmit and receive FIFOs, ensuring efficient buffered communication and reduced CPU overhead.
- High‑Speed Data Transmission:
Supports baud rates from 50 bps up to 115,200 bps, software‑selectable per port.
- Plug‑and‑Play ISA Interface:
Designed for standard ISA bus systems, allowing easy integration into legacy PC/AT architectures.
- Flexible Connector Options:
Includes a DB37 female connector on the card with a breakout cable to four DB9 male connectors (or optional four DB25 male connectors on request).
- Multi‑Operating System Support:
Compatible with DOS, Windows 95/98/ME/NT/2000/XP, Linux, and SCO OpenServer.
- Dual‑Card System Support:
Up to two A402 cards per system, enabling up to eight serial ports in a single PC.
- Robust Design for Industrial and Embedded Use:
Engineered for reliability in industrial automation, instrumentation, and communication control systems.
- Flow Control Options:
Supports both hardware (RTS/CTS) and software (XON/XOFF) flow control mechanisms.
- Comprehensive Driver Package:
Includes drivers and installation utilities for multiple operating systems, ensuring broad compatibility and ease of deployment.
### 3. Technical Specifications
| Parameter | Specification |
|----------------|-------------------|
| Bus Interface | ISA (Industry Standard Architecture) |
| Number of Ports | 4 independent RS232 serial ports |
| UART Type | 16550A compatible with 16‑byte FIFO |
| Baud Rate Range | 50 bps to 115,200 bps |
| Flow Control | RTS/CTS (hardware), XON/XOFF (software) |
| Connector Type | DB37 female on card |
| Breakout Cable | DB37F to 4×DB9M (standard) or 4×DB25M (optional) |
| Maximum Cards per System | 2 |
| Dimensions | 122 mm × 101 mm |
| Weight | Approx. 120 g (card only) |
| Material | Multi‑layer PCB with gold‑plated edge connector |
| Operating Voltage | 5 V DC (ISA bus powered) |
| Operating Temperature | 0 °C to 55 °C (typical) |
| Storage Temperature | ‑20 °C to 85 °C |
| Relative Humidity | 5 % to 95 %, non‑condensing |
| Compliance | RS232C standard |
| Crystal Frequency | 1.8432 MHz (standard) |
| Supported Baud Rate Multipliers | Up to 14.7456 MHz crystal for higher speeds (optional) |
| PCB Finish | Anti‑static coated, gold‑finger edge connector |
| Manufacturer Part Number | A402 |
### 4. Functionality
The Rayon A402 4‑Port RS232 ISA Card provides four asynchronous serial communication channels for PC/AT systems using the ISA bus. Each port operates independently and can be configured for different baud rates and communication parameters.
How It Works:
- The card interfaces with the system’s ISA bus, providing four UART‑based serial channels.
- Each UART (16550A compatible) includes 16‑byte transmit and receive FIFOs, minimizing CPU interrupts and improving throughput.
- The card’s onboard DB37 connector connects via a breakout cable to four DB9 or DB25 connectors, each representing a separate COM port.
- The driver software assigns COM port numbers and manages interrupt sharing between multiple cards.
Use Cases and Applications:
- Industrial automation and control systems requiring multiple serial interfaces.
- Data acquisition and instrumentation systems.
- POS (Point‑of‑Sale) terminals and kiosks.
- Legacy equipment integration in manufacturing or laboratory environments.
- Communication with modems, barcode scanners, PLCs, and serial sensors.
Compatibility:
- Fully compatible with standard RS232C signaling.
- Works with legacy PC/AT ISA systems.
- Supports multiple operating systems including DOS, Windows (95 through XP), Linux, and SCO.
### 5. Components & Accessories
Included Items:
- 1 × A402 ISA 4‑Port RS232 Card (DB37 female connector)
- 1 × Breakout Cable (DB37F to 4×DB9M)
- 1 × Driver Diskette or CD (DOS/Windows/Linux/SCO drivers)
- 1 × User Manual and Installation Guide
Optional Accessories:
- DB37F to 4×DB25M breakout cable (for devices requiring DB25 connectors)
- RS4232‑4 isolated converter box (for galvanic isolation and RS422/485 conversion)
- Replacement or extended breakout cables (A400 or A640 series)
- Anti‑static installation kit (recommended for handling)
Connectors and Pinouts:
- DB37 female connector on card (pin assignments per Appendix A, Table 2)
- DB9 male connectors on breakout cable (standard RS232 pinout)
- Optional DB25 male connectors (standard RS232 pinout)
### 6. Installation & Setup
System Requirements:
- PC/AT compatible system with available ISA slot
- 5 V DC power from ISA bus
- Supported operating system (DOS, Windows 95/98/ME/NT/2000/XP, Linux, SCO)
Installation Procedure:
1. Power off the computer and disconnect from mains.
2. Insert the A402 card into an available ISA slot.
3. Secure the card with the mounting screw.
4. Connect the DB37 breakout cable to the card’s connector.
5. Attach serial devices to the DB9 or DB25 connectors.
6. Power on the system.
7. Install the appropriate driver for your operating system.
Configuration:
- The card supports jumper configuration for card numbering (first or second card in system).
- COM port assignments are managed by the driver software.
- Flow control and baud rate settings are configured via software utilities or operating system device manager.
Mounting Options:
- Standard ISA slot mounting with rear bracket.
- Breakout cable can be panel‑mounted or routed externally for easy access.
Safety Precautions:
- Handle the card using anti‑static precautions.
- Do not insert or remove the card while the system is powered on.
- Ensure proper grounding of connected devices to prevent signal interference.
### 7. Performance & Capabilities
Data Throughput:
- Up to 115.2 kbps per port (standard crystal)
- Up to 921.6 kbps with optional 14.7456 MHz crystal
Buffering:
- 16‑byte transmit and receive FIFOs per port reduce CPU load and prevent data loss during high‑speed communication.
Interrupt Handling:
- Each card requires one IRQ, but multiple cards can share interrupts (IRQ‑shareable design).
- Efficient interrupt management minimizes latency and improves multitasking performance.
Capacity:
- Supports up to two A402 cards per system (total of eight serial ports).
Efficiency:
- FIFO buffering and intelligent interrupt control reduce CPU utilization.
- Suitable for continuous, high‑volume serial data transfer.
Limitations:
- ISA bus bandwidth limits overall throughput compared to PCI or PCIe cards.
- Maximum of two cards per system due to resource constraints.
- RS232 only (no native RS422/485 support without external converter).
### 8. Standards & Compliance
Electrical and Interface Standards:
- RS232C compliant signaling levels.
- Compatible with TIA/EIA‑232‑F standard.
Bus Interface Standard:
- ISA (Industry Standard Architecture) 8/16‑bit bus.
UART Compatibility:
- 16550A standard, ensuring compatibility with most serial communication software.
Operating System Compliance:
- Certified drivers for:
- DOS
- Windows 95, 98, ME
- Windows NT 4.0
- Windows 2000, XP
- Linux (kernel 2.4.x and later, source‑based installation)
- SCO OpenServer
Regulatory and Safety Compliance:
- CE compliant (for European markets)
- FCC Class A (industrial/commercial use)
- RoHS compliant (lead‑free manufacturing)
Industry Standards Supported:
- ISA bus specification
- RS232C communication protocol
- UART 16550A FIFO standard
### 9. Additional Information
Warranty:
- One‑year limited warranty covering defects in materials and workmanship.
- Excludes damage from misuse, unauthorized servicing, or electrical faults.
- Warranty service includes repair or replacement of defective units.
Support & Service:
- Technical support available via email and phone through Rayon Taiwan and Acceed Europe.
- Online resources and driver downloads available at [www.acceed.com/rayon](http://www.acceed.com/rayon).
Maintenance:
- Periodic inspection of connectors and cables recommended.
- Keep card and connectors free from dust and moisture.
- Use anti‑static precautions during handling.
Firmware & Driver Updates:
- Updated drivers available for new operating systems.
- Linux driver source code provided for kernel integration.
- DOS and Windows utilities include diagnostic and demo programs for testing communication ports.
Repair & RMA Procedure:
- Obtain Return Material Authorization (RMA) before returning products.
- Provide model number, serial number, reason for return, and purchase order reference.
- Products under warranty repaired free of charge; out‑of‑warranty repairs subject to flat‑rate service fee.
Environmental Considerations:
- Designed for long‑term operation in industrial environments.
- Complies with environmental standards for electronic waste and recycling.
Documentation:
- Comprehensive user manual included, covering installation, configuration, driver setup, and troubleshooting.
- Appendices provide detailed pin assignments, jumper settings, and cable wiring diagrams.
### Summary
The Rayon A402 4‑Port RS232 ISA Card is a robust, industrial‑grade serial communication interface designed for legacy PC/AT systems requiring multiple RS232 ports. With four independent 16550A‑compatible UARTs, high‑speed data transfer up to 115.2 kbps, and broad OS compatibility, it provides a reliable solution for connecting serial devices in automation, instrumentation, and data acquisition environments. Its plug‑and‑play ISA design, flexible connector options, and comprehensive driver support make it ideal for both new installations and system upgrades where ISA architecture remains in use.
The A402 exemplifies Rayon Technology’s commitment to connectivity and reliability, offering a cost‑effective, high‑performance serial communication solution backed by global support and a one‑year warranty.
### 1. Product Overview
Product Name: 4‑Port RS232 ISA Card
Model: A402
Series: ISA Serial Communication Interface Series
Article Number: A402
Manufacturer: Rayon Technology Inc.
Brand: RAYON
Country of Origin: Taiwan, R.O.C.
Manufacturer Contact:
- Rayon Technology Co., Ltd.
2F, No. 177, Chung‑Shan 2 Road, Lu‑Chou City, Taipei Hsien, Taiwan R.O.C.
Tel: +886‑2‑82858362 | Fax: +886‑2‑82857065 | Email: rayon@ms1.hinet.net
- European Support (Acceed GmbH)
Arnoldstraße 19, 40479 Düsseldorf, Germany
Tel/Fax: +49‑211‑938898‑0 | Email: rayon@acceed.com
### 2. Key Features
- Four Independent RS232 Serial Ports:
Provides four asynchronous serial communication channels via ISA bus interface.
- 16550A UART Compatibility:
Each port uses a 16550A‑compatible UART with 16‑byte transmit and receive FIFOs, ensuring efficient buffered communication and reduced CPU overhead.
- High‑Speed Data Transmission:
Supports baud rates from 50 bps up to 115,200 bps, software‑selectable per port.
- Plug‑and‑Play ISA Interface:
Designed for standard ISA bus systems, allowing easy integration into legacy PC/AT architectures.
- Flexible Connector Options:
Includes a DB37 female connector on the card with a breakout cable to four DB9 male connectors (or optional four DB25 male connectors on request).
- Multi‑Operating System Support:
Compatible with DOS, Windows 95/98/ME/NT/2000/XP, Linux, and SCO OpenServer.
- Dual‑Card System Support:
Up to two A402 cards per system, enabling up to eight serial ports in a single PC.
- Robust Design for Industrial and Embedded Use:
Engineered for reliability in industrial automation, instrumentation, and communication control systems.
- Flow Control Options:
Supports both hardware (RTS/CTS) and software (XON/XOFF) flow control mechanisms.
- Comprehensive Driver Package:
Includes drivers and installation utilities for multiple operating systems, ensuring broad compatibility and ease of deployment.
### 3. Technical Specifications
| Parameter | Specification |
|----------------|-------------------|
| Bus Interface | ISA (Industry Standard Architecture) |
| Number of Ports | 4 independent RS232 serial ports |
| UART Type | 16550A compatible with 16‑byte FIFO |
| Baud Rate Range | 50 bps to 115,200 bps |
| Flow Control | RTS/CTS (hardware), XON/XOFF (software) |
| Connector Type | DB37 female on card |
| Breakout Cable | DB37F to 4×DB9M (standard) or 4×DB25M (optional) |
| Maximum Cards per System | 2 |
| Dimensions | 122 mm × 101 mm |
| Weight | Approx. 120 g (card only) |
| Material | Multi‑layer PCB with gold‑plated edge connector |
| Operating Voltage | 5 V DC (ISA bus powered) |
| Operating Temperature | 0 °C to 55 °C (typical) |
| Storage Temperature | ‑20 °C to 85 °C |
| Relative Humidity | 5 % to 95 %, non‑condensing |
| Compliance | RS232C standard |
| Crystal Frequency | 1.8432 MHz (standard) |
| Supported Baud Rate Multipliers | Up to 14.7456 MHz crystal for higher speeds (optional) |
| PCB Finish | Anti‑static coated, gold‑finger edge connector |
| Manufacturer Part Number | A402 |
### 4. Functionality
The Rayon A402 4‑Port RS232 ISA Card provides four asynchronous serial communication channels for PC/AT systems using the ISA bus. Each port operates independently and can be configured for different baud rates and communication parameters.
How It Works:
- The card interfaces with the system’s ISA bus, providing four UART‑based serial channels.
- Each UART (16550A compatible) includes 16‑byte transmit and receive FIFOs, minimizing CPU interrupts and improving throughput.
- The card’s onboard DB37 connector connects via a breakout cable to four DB9 or DB25 connectors, each representing a separate COM port.
- The driver software assigns COM port numbers and manages interrupt sharing between multiple cards.
Use Cases and Applications:
- Industrial automation and control systems requiring multiple serial interfaces.
- Data acquisition and instrumentation systems.
- POS (Point‑of‑Sale) terminals and kiosks.
- Legacy equipment integration in manufacturing or laboratory environments.
- Communication with modems, barcode scanners, PLCs, and serial sensors.
Compatibility:
- Fully compatible with standard RS232C signaling.
- Works with legacy PC/AT ISA systems.
- Supports multiple operating systems including DOS, Windows (95 through XP), Linux, and SCO.
### 5. Components & Accessories
Included Items:
- 1 × A402 ISA 4‑Port RS232 Card (DB37 female connector)
- 1 × Breakout Cable (DB37F to 4×DB9M)
- 1 × Driver Diskette or CD (DOS/Windows/Linux/SCO drivers)
- 1 × User Manual and Installation Guide
Optional Accessories:
- DB37F to 4×DB25M breakout cable (for devices requiring DB25 connectors)
- RS4232‑4 isolated converter box (for galvanic isolation and RS422/485 conversion)
- Replacement or extended breakout cables (A400 or A640 series)
- Anti‑static installation kit (recommended for handling)
Connectors and Pinouts:
- DB37 female connector on card (pin assignments per Appendix A, Table 2)
- DB9 male connectors on breakout cable (standard RS232 pinout)
- Optional DB25 male connectors (standard RS232 pinout)
### 6. Installation & Setup
System Requirements:
- PC/AT compatible system with available ISA slot
- 5 V DC power from ISA bus
- Supported operating system (DOS, Windows 95/98/ME/NT/2000/XP, Linux, SCO)
Installation Procedure:
1. Power off the computer and disconnect from mains.
2. Insert the A402 card into an available ISA slot.
3. Secure the card with the mounting screw.
4. Connect the DB37 breakout cable to the card’s connector.
5. Attach serial devices to the DB9 or DB25 connectors.
6. Power on the system.
7. Install the appropriate driver for your operating system.
Configuration:
- The card supports jumper configuration for card numbering (first or second card in system).
- COM port assignments are managed by the driver software.
- Flow control and baud rate settings are configured via software utilities or operating system device manager.
Mounting Options:
- Standard ISA slot mounting with rear bracket.
- Breakout cable can be panel‑mounted or routed externally for easy access.
Safety Precautions:
- Handle the card using anti‑static precautions.
- Do not insert or remove the card while the system is powered on.
- Ensure proper grounding of connected devices to prevent signal interference.
### 7. Performance & Capabilities
Data Throughput:
- Up to 115.2 kbps per port (standard crystal)
- Up to 921.6 kbps with optional 14.7456 MHz crystal
Buffering:
- 16‑byte transmit and receive FIFOs per port reduce CPU load and prevent data loss during high‑speed communication.
Interrupt Handling:
- Each card requires one IRQ, but multiple cards can share interrupts (IRQ‑shareable design).
- Efficient interrupt management minimizes latency and improves multitasking performance.
Capacity:
- Supports up to two A402 cards per system (total of eight serial ports).
Efficiency:
- FIFO buffering and intelligent interrupt control reduce CPU utilization.
- Suitable for continuous, high‑volume serial data transfer.
Limitations:
- ISA bus bandwidth limits overall throughput compared to PCI or PCIe cards.
- Maximum of two cards per system due to resource constraints.
- RS232 only (no native RS422/485 support without external converter).
### 8. Standards & Compliance
Electrical and Interface Standards:
- RS232C compliant signaling levels.
- Compatible with TIA/EIA‑232‑F standard.
Bus Interface Standard:
- ISA (Industry Standard Architecture) 8/16‑bit bus.
UART Compatibility:
- 16550A standard, ensuring compatibility with most serial communication software.
Operating System Compliance:
- Certified drivers for:
- DOS
- Windows 95, 98, ME
- Windows NT 4.0
- Windows 2000, XP
- Linux (kernel 2.4.x and later, source‑based installation)
- SCO OpenServer
Regulatory and Safety Compliance:
- CE compliant (for European markets)
- FCC Class A (industrial/commercial use)
- RoHS compliant (lead‑free manufacturing)
Industry Standards Supported:
- ISA bus specification
- RS232C communication protocol
- UART 16550A FIFO standard
### 9. Additional Information
Warranty:
- One‑year limited warranty covering defects in materials and workmanship.
- Excludes damage from misuse, unauthorized servicing, or electrical faults.
- Warranty service includes repair or replacement of defective units.
Support & Service:
- Technical support available via email and phone through Rayon Taiwan and Acceed Europe.
- Online resources and driver downloads available at [www.acceed.com/rayon](http://www.acceed.com/rayon).
Maintenance:
- Periodic inspection of connectors and cables recommended.
- Keep card and connectors free from dust and moisture.
- Use anti‑static precautions during handling.
Firmware & Driver Updates:
- Updated drivers available for new operating systems.
- Linux driver source code provided for kernel integration.
- DOS and Windows utilities include diagnostic and demo programs for testing communication ports.
Repair & RMA Procedure:
- Obtain Return Material Authorization (RMA) before returning products.
- Provide model number, serial number, reason for return, and purchase order reference.
- Products under warranty repaired free of charge; out‑of‑warranty repairs subject to flat‑rate service fee.
Environmental Considerations:
- Designed for long‑term operation in industrial environments.
- Complies with environmental standards for electronic waste and recycling.
Documentation:
- Comprehensive user manual included, covering installation, configuration, driver setup, and troubleshooting.
- Appendices provide detailed pin assignments, jumper settings, and cable wiring diagrams.
### Summary
The Rayon A402 4‑Port RS232 ISA Card is a robust, industrial‑grade serial communication interface designed for legacy PC/AT systems requiring multiple RS232 ports. With four independent 16550A‑compatible UARTs, high‑speed data transfer up to 115.2 kbps, and broad OS compatibility, it provides a reliable solution for connecting serial devices in automation, instrumentation, and data acquisition environments. Its plug‑and‑play ISA design, flexible connector options, and comprehensive driver support make it ideal for both new installations and system upgrades where ISA architecture remains in use.
The A402 exemplifies Rayon Technology’s commitment to connectivity and reliability, offering a cost‑effective, high‑performance serial communication solution backed by global support and a one‑year warranty.
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PCI-Port-015.pdf
Manual
