Comprehensive Product Summary – Rayon Technology A112 PCIe 2-Port RS232/RS422/RS485 Mixed Settable Card

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### 1. Product Overview

Product Name: PCIe 2-Port RS232/RS422/RS485 Card (Mixed Settable)
Model: A112
Series: Advanced PCIe Serial Communication Card Series
Article Number: A112
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
- Websites: [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon), [www.rayontech.com](http://www.rayontech.com)

The Rayon A112 is a professional-grade PCI Express (PCIe) serial communication card designed to provide two independent serial ports, each configurable as RS232, RS422, or RS485. It is engineered for industrial control, automation, and communication applications requiring flexible serial connectivity and reliable data transmission. The card integrates the Moschip MCS9922 controller and supports a wide range of operating systems, including Windows and Linux distributions.

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### 2. Key Features

- Dual-Port Serial Communication: Provides two independent serial ports on a single PCIe interface card.
- Multi-Protocol Support: Each port can be individually configured as RS232, RS422, or RS485 using onboard DIP switches.
- Flexible Configuration: Hardware-level DIP switch selection allows quick and reliable mode switching without software reconfiguration.
- High Compatibility: Fully compatible with PCI Express bus architecture and automatically configured by the system BIOS for I/O, memory, and IRQ mapping.
- Controller Chipset: Integrated Moschip MCS9922 serial communication controller ensures stable performance and broad driver support.
- Baud Rate Range: Supports communication speeds from 50 bps up to 115,200 bps per port.
- Connector Type: Two DB9 male connectors for direct connection to serial devices.
- Plug & Play Installation: Automatic resource allocation by PCI BIOS simplifies installation and setup.
- Operating System Support: Compatible with Windows 2000, XP, Vista, Windows 7, Linux, and other operating systems.
- Industrial-Grade Design: Suitable for industrial control environments with robust operating temperature and humidity ranges.
- Optional Low-Profile Bracket: Available for compact or small-form-factor PC enclosures.
- ADDC (Automatic Data Direction Control): Supported in RS485 mode for efficient half-duplex communication.
- High Reliability: Designed for continuous operation in demanding environments.

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### 3. Technical Specifications

Controller:
- Type: Moschip MCS9922
- Function: Dual-channel serial communication controller compatible with PCIe bus architecture

Bus Interface:
- PCI Express (PCIe) standard slot
- Fully compliant with PCI Express Base Specification

Ports:
- Number of Ports: 2 independent serial ports
- Interface Standards: RS232 / RS422 / RS485 (selectable per port)
- Configuration Method: DIP switch selectable
- Connector Type: DB9 male connectors (x2)

Baud Rate:
- Configurable per port
- Range: 50 bps to 115,200 bps

I/O and IRQ Mapping:
- I/O mapping assigned automatically by PCI BIOS
- Memory mapping assigned automatically by PCI BIOS
- Two IRQ mappings assigned automatically by PCI BIOS

Physical Dimensions:
- Card Size: 75 mm (W) × 90 mm (L)
- Form Factor: Standard PCIe bracket (low-profile bracket available upon 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)

Material and Build:
- PCB: High-quality industrial-grade printed circuit board
- Connectors: Nickel-plated DB9 male connectors for durability and signal integrity
- Bracket: Steel bracket, standard or low-profile option

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### 4. Functionality

The A112 PCIe card functions as a dual-port serial communication interface for computers equipped with PCI Express slots. Each port can be independently configured to operate in RS232, RS422, or RS485 mode, allowing the card to interface with a wide variety of serial devices such as sensors, controllers, PLCs, and industrial instruments.

Operational Modes:
- RS232 Mode: Standard asynchronous serial communication for point-to-point connections.
- RS422 Mode: Differential signaling for long-distance, high-speed communication with improved noise immunity.
- RS485 Mode: Multi-drop communication supporting up to 32 devices on a single bus; includes ADDC (Automatic Data Direction Control) for half-duplex operation.

Use Cases and Applications:
- Industrial automation and process control
- Data acquisition systems
- Embedded system communication
- Laboratory instrumentation
- Serial device networking
- POS (Point of Sale) systems
- SCADA (Supervisory Control and Data Acquisition) systems
- Communication with legacy serial equipment

Compatibility:
- Compatible with standard PCIe slots on desktop PCs, industrial PCs, and embedded systems.
- Supports major operating systems including Windows 2000, XP, Vista, Windows 7, and Linux.
- Works with both 32-bit and 64-bit system architectures (depending on OS driver availability).

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### 5. Components & Accessories

Included Items:
- 1 × A112 PCIe 2-Port RS232/RS422/RS485 Card
- 1 × Standard PCIe mounting bracket
- 1 × User manual or quick installation guide
- 2 × DB9 male connectors integrated on the card

Optional Accessories:
- Low-profile bracket (for small form factor PCs)
- DB9-to-terminal block adapters (for industrial wiring)
- Serial communication cables (DB9 male-to-female or DB9-to-RJ45)

Connectors and Interfaces:
- Two DB9 male connectors for serial communication
- PCIe edge connector for motherboard interface

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### 6. Installation & Setup

System Requirements:
- Available PCI Express slot (x1, x4, x8, or x16 compatible)
- Supported operating system (Windows 2000/XP/Vista/7 or Linux)
- Administrative privileges for driver installation

Installation Steps:
1. Power off the computer and disconnect it from the power source.
2. Open the system chassis and locate an available PCIe slot.
3. Insert the A112 card firmly into the slot and secure it with the bracket screw.
4. Replace the chassis cover and reconnect the power.
5. Boot the system; the PCI BIOS will automatically assign I/O, memory, and IRQ resources.
6. Install the appropriate driver software if required by the operating system.
7. Configure each port’s communication mode (RS232/RS422/RS485) using the onboard DIP switches.
8. Connect serial devices to the DB9 connectors and verify communication.

Configuration:
- DIP switches located on the card allow selection of RS232, RS422, or RS485 mode per port.
- ADDC (Automatic Data Direction Control) can be enabled for RS485 mode to manage data flow automatically.

Mounting Options:
- Standard PCIe bracket for full-height PC cases.
- Optional low-profile bracket for compact or rackmount systems.

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### 7. Performance & Capabilities

Speed and Throughput:
- Supports baud rates from 50 bps to 115,200 bps per port.
- Stable data transmission with minimal latency due to hardware-based control.

Capacity:
- Two independent serial channels per card.
- Each channel can operate in a different communication mode simultaneously.

Efficiency:
- Automatic resource allocation by PCI BIOS reduces configuration complexity.
- ADDC feature enhances RS485 communication efficiency by eliminating manual direction control.

Limitations:
- Maximum baud rate limited to 115,200 bps (standard serial speed).
- Does not include optical isolation (for isolation, see model A102I).
- Requires driver support for advanced OS versions beyond Windows 7 (check manufacturer updates).

Reliability:
- Industrial-grade design ensures stable operation under continuous load.
- Wide environmental tolerance suitable for factory and field applications.

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### 8. Standards & Compliance

Bus Interface Compliance:
- Fully compliant with PCI Express Base Specification.

Communication Standards:
- RS232 (EIA/TIA-232 standard)
- RS422 (EIA/TIA-422 standard)
- RS485 (EIA/TIA-485 standard)

Regulatory and Safety Compliance:
- Designed to meet industrial EMC and safety requirements (specific certifications may vary by region).
- Manufactured under quality control standards of Rayon Technology Co., Ltd.

Operating System Compatibility:
- Windows 2000, Windows XP, Windows Vista, Windows 7
- Linux (kernel-dependent driver support)
- SCO UNIX and other compatible systems

Environmental Compliance:
- RoHS-compliant materials (lead-free PCB and components)

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (duration subject to regional policy; typically 1 year).
- Covers defects in materials and workmanship under normal use.

Technical Support:
- Provided by Rayon Technology Co., Ltd. via email and telephone.
- Online resources and driver downloads available on the official website.

Maintenance:
- No regular maintenance required beyond standard electronic handling precautions.
- Ensure proper ventilation and avoid exposure to excessive humidity or dust.

Firmware and Driver Updates:
- Periodic driver updates available for supported operating systems.
- Firmware updates (if applicable) provided through manufacturer support channels.

Related and Upgrade Models:
- A102I: PCIe card with two ground-isolated RS232 ports.
- A132: PCIe card with two RS422/RS485 ports.
- A102: PCIe card with two RS232 ports.
- A104: PCIe card with four RS232 ports.
- A134: PCIe card with four RS422/RS485 ports.
- A114: PCIe card with four RS232/RS422/RS485 mixed ports.
- A168: PCIe card with eight RS232 ports.

Trademark Notice:
All product names and trademarks mentioned are the property of their respective owners.

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### Summary

The Rayon A112 PCIe 2-Port RS232/RS422/RS485 Mixed Settable Card is a versatile, industrial-grade communication interface designed for users who require flexible serial connectivity within modern PCI Express-based systems. Its dual-port configuration, each independently selectable between RS232, RS422, and RS485 modes, makes it ideal for mixed-environment applications where multiple communication standards coexist.

With its Moschip MCS9922 controller, robust environmental tolerance, and broad OS compatibility, the A112 delivers reliable performance across industrial automation, instrumentation, and data communication systems. The card’s plug-and-play PCIe architecture, DIP switch configurability, and ADDC support for RS485 ensure ease of integration and dependable operation in both legacy and modern computing environments.

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Manufacturer:
Rayon Technology Co., Ltd.
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)