1. Product Overview

Product Name: PCIe Low Profile 4-Port RS232 Card with 5V Power Output
Model: POS104EL
Series: APCIe Series (Advanced PCI Express Serial Communication Cards)
Article Number: POS104EL
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
Website: [www.rayontech.com](http://www.rayontech.com)

The Rayon POS104EL is a compact, low-profile PCI Express (PCIe) expansion card designed to provide four independent RS232 serial communication ports with integrated 5V power output on pin 9. It is optimized for Point-of-Sale (POS) systems, industrial automation, and embedded control applications requiring reliable multi-port serial connectivity. The card is based on the Moschip MCS9904 controller, ensuring stable performance, plug-and-play installation, and broad operating system compatibility.

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2. Key Features

- Four Independent RS232 Ports: Provides four fully functional RS232 serial ports, each capable of independent configuration and operation.
- 5V Power Output on Pin 9: Supplies 5V DC power through pin 9 of each DB9 connector, ideal for powering POS peripherals such as barcode scanners, receipt printers, or card readers.
- Low Profile PCIe Design: Compact 92 × 69 mm form factor suitable for small form factor PCs, embedded systems, and rackmount servers.
- High-Performance Moschip MCS9904 Controller: Each port is managed by a 16950A-compatible UART with 128-byte transmit and receive FIFOs, ensuring efficient data handling and reduced CPU load.
- Flexible Baud Rate Support: Configurable baud rates from 50 bps up to 115,200 bps per port.
- Plug-and-Play Configuration: I/O address, memory mapping, and IRQ assignments are automatically managed by the PCI BIOS, simplifying installation and avoiding resource conflicts.
- Comprehensive OS Support: Compatible with Windows 2000, XP, Vista, Windows 7, and Linux distributions.
- Industrial-Grade Reliability: Designed for continuous operation in industrial and commercial environments with wide temperature and humidity tolerance.
- Expandable Product Family: Compatible with other Rayon PCIe serial cards (A102, A132, A112, A114, A134, A168, A134I, A124I) for scalable serial communication solutions.

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3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Bus Interface | PCI Express (PCIe) x1 slot |
| Controller IC | Moschip MCS9904 (16950A UART compatible) |
| Number of Ports | 4 independent RS232 ports |
| Connector Type | DB44 female on card; breakout cable to 4 × DB9 male |
| Included Cable | R904 cable (DB44 male to 4 × DB9 male) |
| Optional Cable | R901 cable (DB44 male to 4 × DB25 male) |
| Baud Rate Range | 50 bps to 115,200 bps |
| Signal Levels | RS232 standard voltage levels |
| Power Output | +5V DC on pin 9 of each DB9 connector |
| I/O Mapping | Assigned automatically by PCI BIOS |
| Memory Mapping | Assigned automatically by PCI BIOS |
| IRQ Assignment | Four IRQs assigned automatically by PCI BIOS |
| Dimensions | 92 mm (L) × 69 mm (H) |
| Form Factor | Low-profile PCIe bracket |
| 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 | Multi-layer PCB with gold-plated PCIe edge connector |
| Weight | Approx. 80 g (card only) |

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4. Functionality

The POS104EL functions as a four-port serial communication interface card for PCI Express systems. Each port operates independently, allowing simultaneous communication with multiple serial devices. The card’s integrated 5V power output on pin 9 enables direct powering of external RS232 devices, eliminating the need for separate power adapters in POS or kiosk environments.

Use Cases and Applications:
- Point-of-Sale (POS) terminals and retail automation systems
- Industrial control and monitoring equipment
- Data acquisition and instrumentation systems
- Serial device networking and legacy equipment integration
- Embedded computing and kiosk systems

Compatibility:
- Fully compatible with PCI Express x1, x4, x8, and x16 slots.
- Supported operating systems: Windows 2000, XP, Vista, Windows 7, and Linux (kernel 2.6.x and later).
- Compatible with standard RS232 peripherals such as modems, barcode readers, printers, and PLCs.

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5. Components & Accessories

Included Items:
- POS104EL PCIe low-profile 4-port RS232 card
- R904 breakout cable (DB44 male to 4 × DB9 male connectors)
- Low-profile PCIe bracket (pre-installed)
- Driver CD or downloadable driver package
- User manual and installation guide

Optional Accessories:
- R901 cable (DB44 male to 4 × DB25 male connectors)
- RS232/RS422/RS485 converter boxes (e.g., TWIN232, TWIN485, RS4232-4, RS4232-8)
- Ground-isolated serial interface boxes for noise-sensitive environments
- Additional PCIe serial cards for system expansion

Connectors:
- DB44 female connector on the card
- DB9 male connectors on breakout cable (standard RS232 pinout)
- Pin 9 provides +5V DC output for peripheral power

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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 Procedure:
1. Power off the host system and disconnect AC power.
2. Insert the POS104EL card into an available PCIe slot.
3. Secure the card using the bracket screw.
4. Connect the R904 breakout cable to the DB44 connector on the card.
5. Attach serial devices to the DB9 connectors.
6. Power on the system.
7. The PCI BIOS automatically assigns I/O, memory, and IRQ resources.
8. Install the appropriate driver from the provided CD or download from Rayon’s website.
9. Verify installation via Device Manager (Windows) or `/dev/tty` devices (Linux).

Configuration:
- No manual jumper or DIP switch settings required.
- Plug-and-play resource allocation via PCI BIOS.
- Baud rate, parity, stop bits, and flow control configurable via software.

Mounting Options:
- Standard low-profile PCIe bracket for compact systems.
- Optional full-height bracket available upon request.

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7. Performance & Capabilities

Data Throughput:
Each port supports up to 115.2 kbps, suitable for most serial communication applications. The MCS9904 controller’s 128-byte FIFO buffers minimize CPU overhead and prevent data loss during high-speed transfers.

Efficiency:
The card’s hardware-based flow control (RTS/CTS and Xon/Xoff) ensures reliable data transmission even under heavy system load. Automatic resource assignment further enhances system stability.

Power Delivery:
5V output on pin 9 allows direct powering of low-current devices (typically up to 500 mA per port, depending on system power supply capacity).

Limitations:
- Designed for RS232 communication only (no RS422/RS485 support on this model).
- Maximum baud rate limited to 115,200 bps.
- 5V output current limited by PCIe slot power specifications.

Reliability:
Industrial-grade components and gold-plated connectors ensure long-term durability and signal integrity. The card is designed for continuous operation in demanding environments.

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8. Standards & Compliance

Electrical and Interface Standards:
- PCI Express Base Specification Revision 1.1 compliant
- RS232C standard (EIA/TIA-232) compliant
- 16950A UART compatible

Regulatory Compliance:
- CE and FCC Class B compliant (for electromagnetic compatibility)
- RoHS compliant (lead-free manufacturing)
- ISO 9001:2008 certified manufacturing process

Industry Standards Supported:
- Plug and Play (PnP) resource allocation via PCI BIOS
- Standard COM port addressing recognized by Windows and Linux operating systems

Driver Certification:
- Windows WHQL-compatible drivers (via Moschip MCS9904 chipset)
- Linux kernel module support for major distributions (Red Hat, SUSE, Fedora, Slackware)

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9. Additional Information

Warranty:
- One-year limited hardware warranty covering defects in materials and workmanship.
- Warranty excludes damage caused by misuse, electrical surges, or unauthorized modifications.

Support & Maintenance:
- Technical support available via email (rayon@ms1.hinet.net).
- Driver updates and documentation downloadable from [www.rayontech.com](http://www.rayontech.com).
- RMA (Return Material Authorization) process available for defective units.

Maintenance Recommendations:
- Avoid inserting or removing the card while the system is powered on.
- Keep connectors clean and free of dust.
- Ensure adequate ventilation within the host system to maintain operating temperature range.

Product Family and Upgrade Options:
The POS104EL belongs to Rayon’s APCIe series, which includes a range of PCIe serial communication cards with varying port counts and interface types:

| Model | Ports | Interface Type | Isolation |
|------------|------------|--------------------|----------------|
| A102 | 2 × RS232 | Non-isolated | No |
| A132 | 2 × RS422/RS485 | Non-isolated | No |
| A112 | 2 × RS232/RS422/RS485 | Non-isolated | No |
| A104 | 4 × RS232 | Non-isolated | No |
| A134 | 4 × RS422/RS485 | Non-isolated | No |
| A114 | 4 × RS232/RS422/RS485 | Non-isolated | No |
| A134I | 4 × RS422/RS485 | Ground-isolated | Yes |
| A124I | 2 × RS232 + 2 × RS422/RS485 | Ground-isolated | Yes |
| A168 | 8 × RS232 | Non-isolated | No |
| A138 | 8 × RS422/RS485 | Non-isolated | No |
| A118 | 8 × RS232/RS422/RS485 | Non-isolated | No |

Related Accessories and Converters:
- TWIN232: RS232 to RS232/RS422/RS485 ground-isolated converter.
- TWIN485: RS232 to RS422/RS485 converter and repeater.
- UTS004 / UTS485: USB-to-serial converters supporting isolated RS422/RS485 ports.
- RS4232-4 / RS4232-8 Boxes: External isolation boxes for 4 or 8 ports, providing galvanic isolation and mode selection via DIP switches.

Repair and RMA Procedure:
Customers must obtain an RMA number before returning products for repair. Warranty repairs are free of charge for verified defects. Out-of-warranty repairs are subject to a flat-rate service fee.

Technical Support Contact:
- Email: rayon@ms1.hinet.net
- Phone: +886-2-82858362
- Fax: +886-2-82857065

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### Summary

The Rayon POS104EL PCIe Low Profile 4-Port RS232 Card with 5V Power Output is a robust, industrial-grade serial communication solution designed for modern POS and automation systems. Featuring four independent RS232 ports, integrated 5V power delivery, and a compact low-profile design, it provides exceptional flexibility and reliability for multi-device serial connectivity. The Moschip MCS9904 controller ensures stable performance, while plug-and-play PCIe integration simplifies installation and configuration. With comprehensive OS support, industrial environmental tolerance, and compatibility with a wide range of Rayon accessories, the POS104EL is an ideal choice for system integrators, OEMs, and industrial automation professionals seeking a dependable multi-port serial interface solution.