Comprehensive Product Summary – AP112 / A112 PCI/PCIe 2-Port RS232/422/485 Communication Card

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### 1. Product Overview

Product Name: AP112 PCI 2-Port RS232/422/485 Card (Mixed Settable, 5V Only)
Model: AP112 (also referenced as A112 in PCIe variant documentation)
Series: Advanced PCI/PCIe Serial Communication Interface Series
Article Number: AP112
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)

Product Type: PCI (and PCIe variant) serial communication interface card
Primary Function: Provides two independent, configurable serial communication ports supporting RS232, RS422, or RS485 standards.
Voltage Requirement: Single voltage 5V only (for PCI version)
Form Factor: Standard PCI card (AP112) / PCIe card (A112 variant)
Target Applications: Industrial control, automation systems, embedded computing, and serial device interfacing.

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### 2. Key Features

- Dual-Port Serial Communication: Two independent serial ports per card, each configurable as RS232, RS422, or RS485.
- Mixed Mode Configuration: Each port can be individually set to a different communication standard via DIP switch, allowing flexible deployment in mixed environments.
- Ground Isolation: Each port is ground-isolated to prevent electrical interference and protect connected devices.
- High Compatibility: Fully compatible with PCI or PCIe bus architecture, depending on model.
- Plug & Play Operation: Automatic I/O, memory, and IRQ resource assignment by PCI BIOS ensures easy installation without manual configuration.
- High-Speed Data Transfer: Supports baud rates from 50 bps up to 230,400 bps (AP112) or 115,200 bps (A112 variant).
- Advanced Chipset:
- AP112: ASIX MCS9865-compatible 16950a UART controller.
- A112: MosChip MCS9922 serial communication controller.
- ADDC Functionality (RS485): Automatic Data Direction Control (ADDC) for RS485 mode ensures reliable half-duplex communication without software flow control.
- Operating System Support: Compatible with Windows 2000, XP, Vista, Windows 7, and Linux distributions.
- Industrial-Grade Design: Designed for continuous operation in industrial environments with wide temperature and humidity tolerance.
- Compact Dimensions:
- AP112: 100 × 97 mm
- A112: 75 × 90 mm
- Connector Type: Two DB9 male connectors for direct serial device connection.
- Optional Accessories: Low-profile brackets available upon request for compact chassis installations.
- Single Voltage Operation: 5V-only power requirement simplifies integration into standard PCI systems.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Bus Interface | PCI (AP112) / PCI Express (A112) |
| Controller Chip | AP112: ASIX MCS9865-compatible 16950a UART<br>A112: MosChip MCS9922 |
| Number of Ports | 2 independent serial ports |
| Interface Standards | RS232 / RS422 / RS485 (individually selectable per port) |
| Configuration Method | DIP switch selection per port |
| Baud Rate Range | 50 – 230,400 bps (AP112) / 50 – 115,200 bps (A112) |
| Connector Type | 2 × DB9 male connectors |
| I/O Mapping | Assigned automatically by PCI BIOS |
| Memory Mapping | Assigned automatically by PCI BIOS |
| IRQ Mapping | Two IRQs assigned automatically by PCI BIOS |
| Voltage Requirement | 5V only (PCI version) |
| Dimensions | AP112: 100 × 97 mm<br>A112: 75 × 90 mm |
| 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 | Industrial-grade PCB with EMI shielding |
| Bracket Options | Standard PCI/PCIe bracket; low-profile bracket optional |
| Isolation | Ground isolation per port |
| Supported OS | Windows 2000, XP, Vista, Windows 7, Linux, SCO |
| Form Factor | Standard PCI / PCIe half-height compatible |
| Manufacturer | Rayon Technology Co., Ltd. |

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### 4. Functionality

The AP112 card functions as a dual-port serial communication interface for systems requiring reliable and configurable serial connectivity. Each port can be independently configured to operate in RS232, RS422, or RS485 mode using onboard DIP switches. This flexibility allows the card to connect to a wide range of serial devices, including industrial controllers, sensors, PLCs, modems, and legacy equipment.

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, with ADDC for automatic direction control.

Use Cases:
- Industrial automation and process control systems
- Data acquisition and monitoring
- Embedded system integration
- Serial device networking and expansion
- Laboratory instrumentation and test equipment
- Legacy serial device support in modern PCs

Compatibility:
- Fully compatible with standard PCI or PCIe slots (depending on model).
- Works with major operating systems without requiring proprietary drivers.
- Supports both 32-bit and 64-bit system architectures.

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### 5. Components & Accessories

Included Components:
- 1 × AP112 PCI 2-Port RS232/422/485 Card
- 2 × DB9 male connectors (integrated on bracket)
- 1 × Standard PCI bracket (pre-installed)
- 1 × User manual or quick installation guide

Optional Accessories:
- Low-profile bracket for compact or rackmount systems
- RS232/RS422/RS485 adapter cables (if required by application)
- Additional driver or utility software (available from manufacturer website)

Connectors and Interfaces:
- Two DB9 male connectors for serial communication
- PCI or PCIe edge connector for motherboard interface
- DIP switches for port mode configuration (RS232/RS422/RS485 selection)

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### 6. Installation & Setup

System Requirements:
- Available PCI (for AP112) or PCIe (for A112) slot
- 5V power supply (for PCI version)
- Compatible operating system (Windows 2000/XP/Vista/7 or Linux)

Installation Steps:
1. Power off the host system and disconnect from power.
2. Insert the AP112 card into an available PCI slot, ensuring firm seating.
3. Secure the card using the bracket screw.
4. If required, replace the standard bracket with a low-profile bracket before installation.
5. Power on the system; the BIOS will automatically assign I/O, memory, and IRQ resources.
6. Install drivers if necessary (most systems will auto-detect and configure).
7. Configure each port’s communication mode (RS232/RS422/RS485) using the onboard DIP switches.
8. Connect serial devices using the DB9 connectors.

Configuration Notes:
- Each port’s mode can be changed independently.
- DIP switch settings must be configured before powering on the system.
- ADDC function in RS485 mode requires no additional software configuration.

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### 7. Performance & Capabilities

Data Transmission:
- Supports full-duplex communication in RS232 and RS422 modes.
- Supports half-duplex communication in RS485 mode with automatic direction control.
- Baud rate configurable from 50 bps up to 230,400 bps (AP112) or 115,200 bps (A112).

Efficiency:
- Hardware-based flow control ensures stable data transmission.
- Ground isolation minimizes electrical noise and cross-talk between ports.
- PCI BIOS resource allocation reduces CPU overhead and simplifies system integration.

Capacity:
- Two independent serial channels per card.
- Each channel can operate under different communication standards simultaneously.
- Supports multiple cards in a single system for expanded port count.

Limitations:
- AP112 operates on 5V PCI slots only (not compatible with 3.3V PCI-X).
- Maximum baud rate limited to 230,400 bps.
- Environmental operation limited to 0–55°C ambient temperature.

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### 8. Standards & Compliance

Bus Standards:
- PCI Local Bus Specification (Revision 2.2 compliant)
- PCI Express Base Specification (for A112 variant)

Communication Standards:
- EIA/TIA RS232
- EIA/TIA RS422
- EIA/TIA RS485

Electrical & Safety Compliance:
- Ground isolation per port for enhanced safety and signal integrity
- Designed for industrial-grade EMI/ESD protection

Software & OS Compliance:
- Compatible with Microsoft Windows 2000, XP, Vista, Windows 7
- Compatible with major Linux distributions
- SCO UNIX support available

Industry Certifications:
- CE and FCC compliance (typical for Rayon industrial communication products)
- RoHS-compliant manufacturing process

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### 9. Additional Information

Warranty:
Standard manufacturer warranty provided by Rayon Technology Co., Ltd. (duration and terms vary by region and distributor).

Technical Support:
- Direct support via email (rayon@ms1.hinet.net)
- Online resources, driver downloads, and documentation available at [www.rayontech.com](http://www.rayontech.com)

Maintenance:
- No periodic maintenance required beyond standard system care.
- Ensure adequate ventilation and dust-free environment for optimal performance.
- Firmware and driver updates available from manufacturer website.

Product Family and Upgrade Options:
Rayon Technology offers a full range of related serial communication cards for various interface and port count requirements:

| Model | Description |
|------------|-----------------|
| A102I | PCIe card supporting two ground-isolated RS232 ports |
| A132 | PCIe card supporting two RS422/RS485 ports |
| A102 | PCIe card supporting two RS232 ports |
| A104 | PCIe card supporting four RS232 ports |
| A134 | PCIe card supporting four RS422/RS485 ports |
| A114 | PCIe card supporting four RS232/RS422/RS485 ports |
| A168 | PCIe card supporting eight RS232 ports |

Trademarks:
All product names, trademarks, and registered trademarks are the property of their respective owners.

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### Summary

The Rayon AP112 PCI 2-Port RS232/422/485 Card is a robust, industrial-grade communication interface designed for systems requiring flexible and reliable serial connectivity. With two independently configurable ports, ground isolation, and support for multiple communication standards, it provides a versatile solution for industrial automation, embedded systems, and legacy device integration. Its plug-and-play PCI architecture, broad OS compatibility, and DIP switch configurability make it ideal for both OEM integration and system expansion. The AP112’s 5V-only design ensures compatibility with standard PCI systems, while the A112 PCIe variant extends the same functionality to modern platforms. Together, they represent a comprehensive solution for serial communication in demanding industrial and commercial environments.