Comprehensive Product Summary – Rayon Technology A112-I PCIe Isolated 2-Port RS232/422/485 Card

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### 1. Product Overview

Product Name: PCIe Isolated 2-Port RS232/422/485 Card (Mixed Setting)
Model: A112-I
Series: A100 Series PCIe Serial Communication Cards
Article Number: A112-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
- Websites: [www.rayontech.com](http://www.rayontech.com), [www.computex.com.tw/rayon](http://www.computex.com.tw/rayon)

The Rayon A112-I is a professional-grade PCI Express (PCIe) serial communication card designed for industrial and embedded applications requiring flexible, isolated serial connectivity. It provides two independent, ground-isolated serial ports, each configurable as RS232, RS422, or RS485 via onboard DIP switches. The card is engineered for high reliability, robust signal integrity, and broad operating system compatibility, making it suitable for industrial automation, control systems, and data communication environments.

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### 2. Key Features

- Dual-Port PCIe Serial Interface: Provides two independent serial communication ports on a single PCIe card.
- Selectable Communication Modes: Each port can be individually configured as RS232, RS422, or RS485 using DIP switches, allowing mixed-mode operation.
- Ground Isolation: Each port is galvanically isolated to prevent ground loops and protect connected devices from electrical interference.
- High Compatibility: Fully compatible with PCI Express bus architecture and recognized automatically by the system BIOS for I/O, memory, and IRQ mapping.
- Flexible Baud Rate Support: Each port supports baud rates from 50 bps up to 115,200 bps, suitable for a wide range of serial communication devices.
- ADDC (Automatic Data Direction Control) for RS485: Enables automatic control of data direction in RS485 mode, simplifying half-duplex communication.
- Plug-and-Play Installation: The card is automatically detected and configured by the PCI BIOS, minimizing manual setup.
- Industrial-Grade Design: Built for industrial control applications requiring stable, isolated serial communication.
- Operating System Support: Compatible with Windows 2000, XP, Vista, Windows 7, and Linux distributions.
- Compact Form Factor: Standard PCIe card size with optional low-profile bracket for small form factor systems.
- Durable Construction: Manufactured with high-quality materials for long-term reliability in demanding environments.

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### 3. Technical Specifications

Controller Chip: Moschip MCS9922 (16950A compatible)
Bus Interface: PCI Express (PCIe)
Number of Ports: 2 independent serial ports
Interface Standards: RS232 / RS422 / RS485 (selectable per port)
Isolation: Ground isolation per port
Baud Rate Range: 50 bps to 115,200 bps
Connector Type: 2 × DB9 male connectors
Configuration Method: DIP switch selectable per port
I/O Mapping: Assigned automatically by PCI BIOS
Memory Mapping: Assigned automatically by PCI BIOS
IRQ Mapping: Assigned automatically by PCI BIOS

Physical Dimensions:
- Card size: 100 mm × 97 mm
- Optional 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: Industrial-grade multilayer board
- Connectors: Nickel-plated DB9 male connectors
- Bracket: Stainless steel, standard PCIe form factor (low-profile optional)

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### 4. Functionality

The A112-I functions as a dual-port serial communication interface card for systems equipped with PCI Express slots. Each port can be independently configured to operate in RS232, RS422, or RS485 mode, allowing simultaneous communication with different types of serial devices.

Operational Modes:
- RS232 Mode: Standard asynchronous serial communication for point-to-point connections with devices such as modems, barcode scanners, or serial terminals.
- RS422 Mode: Differential signaling for long-distance, high-speed, full-duplex communication with industrial controllers or sensors.
- RS485 Mode: Differential signaling for multi-drop, half-duplex communication networks, commonly used in industrial automation and building management systems.

Configuration:
- DIP switches on the card allow users to select the desired communication mode for each port.
- The ADDC (Automatic Data Direction Control) feature simplifies RS485 operation by automatically managing data direction without software intervention.

Use Cases and Applications:
- Industrial automation and process control
- SCADA (Supervisory Control and Data Acquisition) systems
- Building automation and environmental monitoring
- Embedded systems requiring serial communication
- Laboratory instrumentation and data acquisition
- Communication with legacy serial devices in modern PC-based systems

Compatibility:
- Compatible with standard PCI Express slots (x1, x4, x8, x16).
- Supported operating systems include Windows 2000, XP, Vista, Windows 7, and Linux.
- Works with most serial communication software and drivers supporting standard COM port interfaces.

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### 5. Components & Accessories

Included Items:
- 1 × A112-I PCIe 2-Port RS232/422/485 Card
- 1 × Standard PCIe mounting bracket
- 1 × User manual or quick installation guide
- 1 × Driver CD or downloadable driver package (depending on distribution)

Optional Accessories:
- Low-profile PCIe bracket for compact or small form factor PCs
- DB9-to-terminal block adapters for easy wiring in industrial environments
- Shielded serial cables for noise-sensitive installations

Connectors:
- Two DB9 male connectors on the bracket, each corresponding to one serial port
- Internal DIP switches for mode selection (RS232/RS422/RS485)

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### 6. Installation & Setup

System Requirements:
- Available PCI Express slot (x1 or higher)
- Compatible 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. Insert the A112-I card into an available PCIe slot.
3. Secure the card using the provided bracket screw.
4. Reconnect power and boot the system.
5. The system BIOS automatically assigns I/O, memory, and IRQ resources.
6. Install the appropriate driver from the included CD or manufacturer’s website.
7. Configure each port’s communication mode using the onboard DIP switches.
8. Verify installation through the operating system’s device manager or serial port utility.

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

Configuration:
- DIP switches allow per-port selection of RS232, RS422, or RS485 mode.
- Baud rate, parity, stop bits, and flow control are configured via software or terminal settings.

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### 7. Performance & Capabilities

Speed and Throughput:
- Supports baud rates from 50 bps to 115,200 bps per port.
- Reliable data transmission with minimal latency due to hardware-based UART (16950A compatible).
- Efficient interrupt handling through PCI BIOS-assigned IRQs.

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

Efficiency:
- Ground isolation ensures stable communication and protects against electrical noise.
- ADDC feature enhances RS485 communication efficiency by automating data direction control.
- PCIe interface provides high-speed data transfer between the card and host system.

Limitations:
- Maximum baud rate limited to 115,200 bps (standard serial speed).
- Not designed for high-voltage or non-standard serial protocols.
- Requires proper configuration of DIP switches for correct operation.

Reliability:
- Industrial-grade design ensures long-term stability in harsh environments.
- Wide humidity tolerance and moderate temperature range support continuous operation in industrial settings.

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### 8. Standards & Compliance

Bus Interface Standard: PCI Express (PCIe)
Serial Communication Standards: RS232 (EIA/TIA-232), RS422 (EIA/TIA-422), RS485 (EIA/TIA-485)
Controller Compliance: Moschip MCS9922, 16950A UART compatible
Electrical Isolation: Ground isolation per port
Operating System Compliance: Windows 2000/XP/Vista/7, Linux, SCO UNIX
Environmental Compliance: Designed for industrial operating conditions (0°C–55°C, 10–95% RH)
Regulatory Compliance:
- CE and FCC compliance (typical for Rayon industrial cards)
- RoHS-compliant materials (lead-free manufacturing)
Industry Standards:
- PCI Express Base Specification
- EIA/TIA serial communication standards
- ISO 9001 manufacturing quality assurance (Rayon Technology)

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year, depending on region and distributor).
- Covers defects in materials and workmanship under normal use.

Technical Support:
- Provided by Rayon Technology via email and phone.
- Driver updates and documentation available on the official website.
- Technical assistance for installation, configuration, and troubleshooting.

Maintenance:
- No periodic maintenance required beyond ensuring clean contacts and proper ventilation.
- Firmware and driver updates recommended for optimal performance and compatibility.

Product Lifecycle and Upgrades:
- The A112-I is part of Rayon’s modular PCIe serial card family, allowing easy scalability.
- Related models include:
- A102: PCIe card with two RS232 ports
- A104: PCIe card with four RS232 ports
- A132: PCIe card with two RS422/RS485 ports
- A134: PCIe card with four RS422/RS485 ports
- A114: PCIe card with four RS232/RS422/RS485 ports
- A168: PCIe card with eight RS232 ports

Support Resources:
- Driver downloads, manuals, and technical documentation available at [www.rayontech.com](http://www.rayontech.com).
- Email support: rayon@ms1.hinet.net
- Telephone support: +886-2-82858362

Manufacturer’s Note:
All product names and trademarks mentioned are the property of their respective owners. Specifications are subject to change without notice to improve performance or compatibility.

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### Summary

The Rayon A112-I PCIe Isolated 2-Port RS232/422/485 Card is a versatile, industrial-grade communication interface designed for systems requiring flexible and isolated serial connectivity. With two independently configurable ports supporting RS232, RS422, and RS485 standards, it offers exceptional adaptability for mixed communication environments. The card’s ground isolation, ADDC feature, and robust PCIe architecture ensure reliable, interference-free operation in industrial and embedded applications. Its compatibility with multiple operating systems, plug-and-play installation, and optional low-profile bracket make it suitable for a wide range of industrial PCs, automation controllers, and data acquisition systems.

Built on the proven Moschip MCS9922 controller, the A112-I delivers stable performance, efficient data handling, and long-term reliability, making it a dependable solution for engineers and system integrators seeking a high-quality, configurable serial communication interface.