Comprehensive Product Summary – AP112-I / A112I PCI Isolated 2-Port RS232/422/485 Card (5V Only)

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### 1. Product Overview

Product Name: PCI Isolated 2-Port RS232/422/485 Card (Mixed Setting, 5V Only)
Model: AP112-I (also referenced as A112I)
Series: Advanced PCI/PCIe Serial Communication Interface Cards
Article Number: AP112-I
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
- Web: [www.rayontech.com](http://www.rayontech.com) / [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)

Product Type: PCI/PCIe serial communication interface card with dual isolated ports supporting RS232, RS422, and RS485 communication standards.
Intended Use: Industrial control, automation systems, embedded computing, and serial communication integration requiring electrical isolation and flexible interface configuration.

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### 2. Key Features

- Dual-Port Serial Communication: Provides two independent serial communication ports on a single PCI or PCIe card.
- Ground Isolation: Each port is galvanically isolated to prevent ground loops and electrical interference, ensuring stable operation in industrial environments.
- Multi-Protocol Support: Each port can be individually configured for RS232, RS422, or RS485 operation via onboard DIP switches.
- Flexible Configuration: DIP switch selection allows quick and easy reconfiguration without software intervention.
- High Compatibility: Fully compatible with standard PCI or PCI Express bus slots, depending on model variant.
- Plug & Play Installation: Automatic I/O address, memory mapping, and IRQ assignment by the PCI BIOS.
- High-Performance UART: Each port uses an ASIX-compatible 16950A UART (MCS9865 or MCS9922 controller), supporting advanced buffering and high-speed data transfer.
- Baud Rate Range: Supports communication speeds from 50 bps up to 115,200 bps (AP112-I) or up to 230,400 bps (depending on chipset configuration).
- ADDC (Automatic Data Direction Control): Supported in RS485 mode for automatic transmit/receive switching, simplifying half-duplex communication.
- Industrial-Grade Design: Designed for robust operation in industrial control systems, automation, and data acquisition environments.
- Operating System Support: Compatible with Windows 2000, XP, Vista, Windows 7, and Linux distributions.
- Compact Form Factor: Standard PCI/PCIe card dimensions (100 mm × 97 mm) suitable for standard and low-profile enclosures.
- Optional Accessories: Low-profile brackets available upon request for compact system integration.

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### 3. Technical Specifications

Hardware Controller:
- Chipset: MosChip MCS9922 (PCIe variant) / ASIX-compatible 16950A UART (PCI variant MCS9865)
- Bus Interface: PCI or PCI Express (depending on model)
- Voltage Requirement: Single 5V operation

Ports and Interfaces:
- Number of Ports: 2 independent serial ports
- Interface Standards: RS232, RS422, RS485 (each port selectable)
- Isolation: Ground isolation per port
- Connector Type: Two DB9 male connectors
- Configuration Method: DIP switch selectable per port

Performance:
- Baud Rate: 50 to 115,200 bps (standard); up to 230,400 bps supported on compatible chipsets
- Data Bits: 5, 6, 7, or 8 bits
- Stop Bits: 1 or 2
- Parity: None, Even, Odd, Mark, Space
- Flow Control: Hardware (RTS/CTS), Software (XON/XOFF)
- FIFO Buffer: 16-byte or 128-byte FIFO (depending on UART configuration)

Physical Characteristics:
- Dimensions: 100 mm (L) × 97 mm (H)
- Form Factor: Standard PCI/PCIe bracket; low-profile bracket optional
- Weight: Approx. 80–120 g (typical, depending on bracket type)
- Material: PCB with industrial-grade components and EMI shielding

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)

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### 4. Functionality

The AP112-I / A112I card functions as a dual-port serial communication interface for systems requiring reliable, isolated serial connectivity. Each port can independently operate as RS232, RS422, or RS485, allowing mixed-mode configurations on a single card.

Operational Modes:
- RS232 Mode: Standard serial communication for point-to-point connections with full-duplex operation.
- RS422 Mode: Differential signaling for long-distance, high-speed, full-duplex communication.
- RS485 Mode: Differential signaling for multi-drop networks, supporting half-duplex operation with ADDC automatic direction control.

Use Cases and Applications:
- Industrial automation and process control systems
- SCADA and PLC communication interfaces
- Data acquisition and instrumentation
- Embedded systems requiring serial expansion
- POS (Point of Sale) and kiosk systems
- Laboratory and test equipment communication
- Legacy serial device integration in modern PCs

Compatibility:
- Compatible with standard PCI or PCIe slots on desktop PCs, industrial PCs, and embedded controllers.
- Supported operating systems include Windows 2000, XP, Vista, Windows 7, and Linux (kernel-level driver support).
- Fully plug-and-play compliant with automatic resource allocation by the system BIOS.

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### 5. Components & Accessories

Included Components:
- 1 × AP112-I / A112I PCI or PCIe card
- 2 × DB9 male connectors (onboard or via bracket)
- 1 × Standard PCI/PCIe bracket (pre-installed)
- 1 × User manual or quick installation guide

Optional Accessories:
- Low-profile bracket (for compact chassis)
- RS232/RS422/RS485 adapter cables (if required for specific pinouts)
- Driver and utility CD (or downloadable from manufacturer website)

Connectors and Pinouts:
- DB9 male connectors conforming to standard RS232/RS422/RS485 pin assignments
- DIP switches for mode selection (RS232/RS422/RS485 per port)

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### 6. Installation & Setup

System Requirements:
- Available PCI or PCI Express slot (depending on model)
- 5V power supply from the system bus
- Supported operating system (Windows 2000/XP/Vista/7 or Linux)

Installation Steps:
1. Power off the host system and remove the cover.
2. Insert the AP112-I / A112I card into an available PCI or PCIe slot.
3. Secure the card with the bracket screw.
4. Connect serial devices to the DB9 connectors.
5. Configure each port’s communication mode (RS232/RS422/RS485) using the onboard DIP switches.
6. Power on the system; the BIOS will automatically assign I/O addresses, memory mapping, and IRQs.
7. Install the appropriate driver for your operating system (available from Rayon Technology).
8. Verify installation through the device manager or system configuration utility.

Configuration Options:
- DIP Switch Settings: Determine the communication standard per port.
- Software Configuration: Baud rate, parity, stop bits, and flow control can be set via the operating system or application software.

Mounting Options:
- Standard PCI/PCIe bracket for desktop or industrial PC chassis.
- Optional low-profile bracket for compact enclosures.

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### 7. Performance & Capabilities

Data Throughput:
- Supports up to 115.2 kbps (standard) or 230.4 kbps (enhanced) per port.
- Full-duplex operation in RS232 and RS422 modes; half-duplex in RS485 mode.

Isolation Performance:
- Ground isolation between ports and system bus minimizes electrical noise and prevents damage from ground potential differences.

Efficiency and Reliability:
- Hardware FIFO buffering reduces CPU load and ensures smooth data transmission.
- Automatic resource allocation simplifies system integration.
- ADDC feature in RS485 mode eliminates the need for manual direction control, improving communication efficiency.

Limitations:
- Single voltage operation (5V only) – not compatible with 3.3V-only PCI slots.
- Maximum baud rate limited to 230.4 kbps (not suitable for ultra-high-speed serial applications).
- Operating temperature limited to 55°C – may require additional cooling in high-temperature environments.

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### 8. Standards & Compliance

Bus Interface Standards:
- PCI Local Bus Specification Revision 2.2 (for AP112-I)
- PCI Express Base Specification Revision 1.1 (for A112I variant)

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

Electrical and Safety Compliance:
- Ground isolation per port for enhanced safety and noise immunity
- Designed for compliance with CE and FCC Class B electromagnetic compatibility standards (typical for industrial communication cards)

Software and Driver Compliance:
- WHQL-compatible drivers for Windows operating systems
- Open-source driver support for Linux environments

Environmental Compliance:
- RoHS-compliant manufacturing process (lead-free components)

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year, depending on region and distributor).

Technical Support:
- Provided by Rayon Technology Co., Ltd. via email and online resources.
- Driver downloads, manuals, and configuration guides available on the official website.

Maintenance:
- No regular maintenance required beyond ensuring clean contacts and proper ventilation.
- Firmware and driver updates available periodically to maintain compatibility with new operating systems.

Product Family and Upgrade Options:
Rayon Technology offers a complete range of serial communication cards compatible with the AP112-I / A112I, allowing scalability and customization:
- A102: PCIe card supporting two RS232 ports
- A104: PCIe card supporting four RS232 ports
- A132: PCIe card supporting two RS422/RS485 ports
- A134: PCIe card supporting four RS422/RS485 ports
- A114: PCIe card supporting four RS232/RS422/RS485 mixed ports
- A168: PCIe card supporting eight RS232 ports

These models share similar design principles, ensuring consistent driver support and installation procedures across the product line.

Manufacturer Notes:
All product names and trademarks mentioned are the property of their respective owners. Rayon Technology reserves the right to modify specifications without prior notice to improve product performance or compatibility.

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### Summary

The Rayon Technology AP112-I / A112I PCI Isolated 2-Port RS232/422/485 Card is a robust, industrial-grade communication interface designed for systems requiring flexible, isolated serial connectivity. With two independently configurable ports, each supporting RS232, RS422, or RS485 standards, the card provides exceptional versatility for industrial automation, data acquisition, and embedded control applications.

Its ground isolation, DIP switch configurability, and ADDC support make it ideal for environments where electrical noise and mixed communication standards coexist. The card’s plug-and-play PCI/PCIe interface, broad OS compatibility, and compact design ensure seamless integration into both legacy and modern computing platforms.

Engineered by Rayon Technology Co., Ltd., the AP112-I / A112I exemplifies reliability, configurability, and performance in industrial serial communication solutions.