1. Product Overview
Product Name: PCIe 2-Port RS232 and 2-Port RS485/422 Communication Card
Model: COM-8524
Series: COM Series Industrial Communication Interfaces
Article Number: COM-8524
Manufacturer: JS Automation

The JS Automation COM-8524 is a high-performance PCI Express (PCIe) communication interface card designed to provide reliable serial connectivity for industrial, laboratory, and embedded computing environments. It integrates two RS-232 ports and two RS-485/422 ports on a single PCIe expansion card, offering flexible serial communication capabilities for a wide range of control, automation, and data acquisition systems. The card is engineered for robust performance, low power consumption, and compatibility with modern PCI Express architectures, making it suitable for both legacy and contemporary serial communication applications.

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2. Key Features
- Dual Interface Support: Provides two independent RS-232 ports and two RS-485/422 ports, enabling simultaneous communication with multiple serial devices.
- PCI Express Interface: Fully compliant with PCI Express standards, ensuring high-speed data transfer and compatibility with modern PC architectures.
- High-Speed Communication: Supports data rates up to 921.6 kBd, allowing for fast and reliable serial data transmission.
- Advanced UART Controller: Equipped with 16550-compatible UARTs featuring 128-byte FIFO buffers, minimizing CPU load and improving data throughput.
- Flexible Configuration: Each port can be configured independently for RS-232 or RS-485/422 operation, depending on the application requirements.
- Compact Design: The card measures 114 mm x 104 mm, suitable for standard PCIe slots in desktop and industrial PCs.
- Low Power Requirement: Operates solely on 3.3V DC, reducing power consumption and heat generation.
- Multi-Board Support: Up to four COM-8524 boards can be installed in a single PC system, expanding the number of available serial ports.
- Durable Connectors: Includes two DB9 male D-sub connectors for RS-232 and RS-485/422 interfaces, ensuring secure and reliable physical connections.
- Included Bracket: Comes with an SM23410 bracket for COM2 and COM3 ports, providing easy access to all four serial channels.
- Industrial Reliability: Designed for continuous operation in demanding environments, with stable signal integrity and robust electrical isolation.

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3. Technical Specifications
- Interface Type: PCI Express (PCIe)
- Number of Ports: 4 total (2 × RS-232, 2 × RS-485/422)
- UART Type: 16550-compatible with 128-byte FIFO
- Maximum Baud Rate: 921.6 kBd
- Connectors:
- 2 × DB9 male D-sub connectors (for RS-232 and RS-485/422)
- SM23410 bracket for COM2 and COM3 (2 × DB9 male)
- Power Requirements: 3.3V DC (supplied via PCIe slot)
- Dimensions: 114 mm (L) × 104 mm (W)
- Maximum Boards per System: 4
- Operating Voltage: 3.3V DC only
- Form Factor: PCI Express x1 compatible
- Material: High-quality PCB with gold-plated edge connector and metal bracket
- Operating Temperature Range: Typically 0°C to 60°C (industrial-grade tolerance may vary by configuration)
- Storage Temperature Range: -20°C to 85°C (typical)
- Relative Humidity: 5% to 95% non-condensing
- Weight: Approximately 120–150 g (depending on bracket configuration)

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4. Functionality
The COM-8524 functions as a multi-port serial communication interface card that allows a host PC to communicate with external serial devices through RS-232 and RS-485/422 protocols. It is installed into a PCI Express slot on the motherboard, where it is automatically recognized by the operating system once the appropriate drivers are installed.

- RS-232 Functionality:
The two RS-232 ports support standard asynchronous serial communication, suitable for connecting devices such as barcode scanners, modems, printers, and industrial controllers. Each port supports full-duplex communication and standard RS-232 signal levels.

- RS-485/422 Functionality:
The two RS-485/422 ports support differential signaling for long-distance and noise-resistant communication. RS-485 allows for multi-drop configurations, enabling multiple devices to share the same communication bus. RS-422 supports point-to-point high-speed communication over longer cable lengths.

- Use Cases and Applications:
- Industrial automation and process control systems
- Data acquisition and monitoring equipment
- Laboratory instrumentation and test systems
- Building management and HVAC control
- Embedded systems requiring serial expansion
- Legacy equipment integration in modern PCs
- SCADA and PLC communication interfaces

- Compatibility:
Compatible with major operating systems including Windows, Linux, and other platforms supporting PCIe serial drivers. The card can coexist with other PCIe devices and supports up to four COM-8524 cards per system for expanded serial connectivity.

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5. Components & Accessories
Included Items:
- COM-8524 PCIe card (main board)
- SM23410 bracket for COM2 and COM3 (2 × DB9 male connectors)
- User documentation or quick installation guide
- Driver CD or downloadable driver package (depending on distribution)

Optional Accessories:
- Additional DB9-to-terminal block adapters for field wiring
- RS-485/422 termination resistors and biasing kits
- Extended or low-profile brackets for compact PC enclosures
- Shielded serial cables for noise-sensitive environments

Connectors and Interfaces:
- Two DB9 male connectors on the main bracket for COM1 and COM4
- Two DB9 male connectors on the SM23410 auxiliary bracket for COM2 and COM3
- PCIe edge connector for host interface and power supply

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6. Installation & Setup
Requirements:
- Available PCI Express slot (x1 or higher)
- 3.3V DC power supplied through the PCIe bus
- Compatible operating system with appropriate driver support

Installation Steps:
1. Power off the host PC and disconnect it from the power source.
2. Remove the system cover and locate an available PCIe slot.
3. Insert the COM-8524 card firmly into the slot, ensuring proper alignment.
4. Secure the card using the bracket screw.
5. Attach the SM23410 bracket to an adjacent slot opening if required for COM2 and COM3 access.
6. Reassemble the system and power it on.
7. Install the provided drivers or allow the operating system to detect and configure the card automatically.
8. Verify port assignments and communication parameters in the device manager or system configuration utility.

Configuration:
- Each port can be configured for baud rate, parity, stop bits, and flow control through software.
- RS-485/422 modes can be selected via jumpers or software (depending on version).
- Supports automatic direction control for RS-485 half-duplex communication.

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

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7. Performance & Capabilities
- Data Rate: Up to 921.6 kBd per port, supporting high-speed serial communication.
- FIFO Buffer: 128-byte transmit and receive buffers per UART, reducing CPU overhead and ensuring smooth data flow.
- Signal Integrity: Differential signaling for RS-485/422 ensures reliable communication over long distances (up to 1200 meters depending on cable quality and baud rate).
- Multi-Board Operation: Supports installation of up to four COM-8524 cards in a single system, providing up to 16 serial ports.
- Power Efficiency: Operates exclusively on 3.3V DC, minimizing power draw and heat output.
- Latency and Throughput: Optimized for low-latency communication with minimal jitter, suitable for real-time control applications.
- Limitations:
- Does not support hardware isolation between ports (external isolation recommended for high-voltage environments).
- Limited to PCIe slots providing 3.3V power (not compatible with legacy PCI slots).
- Maximum of four cards per system due to resource allocation constraints.

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8. Standards & Compliance
- Interface Standards:
- PCI Express Base Specification (Revision 1.1 or later)
- RS-232 (EIA/TIA-232-F)
- RS-422 (EIA/TIA-422-B)
- RS-485 (EIA/TIA-485-A)

- Electrical Compliance:
- 3.3V DC operation per PCIe specification
- ESD protection on serial lines (implementation dependent)

- Environmental and Safety Standards:
- RoHS compliant (Restriction of Hazardous Substances)
- CE marking for electromagnetic compatibility (EMC)
- FCC Class B compliance for emissions (typical for industrial communication cards)

- Industry Standards:
- UART 16550 compatibility ensures interoperability with standard serial communication software and drivers.
- Compatible with standard DB9 pin assignments for RS-232 and RS-485/422 communication.

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9. Additional Information
- Warranty: Typically includes a 1- to 2-year limited manufacturer’s warranty covering defects in materials and workmanship.
- Technical Support: JS Automation provides driver updates, installation guides, and technical assistance through its support portal and authorized distributors.
- Maintenance:
- No routine maintenance required beyond ensuring clean contacts and secure connections.
- Periodic inspection recommended for industrial environments to prevent dust accumulation.
- Firmware & Driver Updates:
- Drivers available for Windows and Linux platforms.
- Firmware updates (if applicable) can be applied via software utility provided by JS Automation.
- Service Life: Designed for long-term operation in industrial and commercial systems, with high MTBF (Mean Time Between Failures).
- Documentation: Comprehensive datasheet, installation manual, and pinout diagrams available from JS Automation’s website.

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Summary
The JS Automation COM-8524 PCIe 2-Port RS232 and 2-Port RS485/422 Card is a versatile, high-performance serial communication solution for industrial and embedded applications. Combining two RS-232 and two RS-485/422 interfaces on a single PCI Express card, it delivers flexible connectivity, high-speed data transfer up to 921.6 kBd, and reliable operation with minimal power consumption. Its 16550-compatible UARTs with 128-byte FIFOs ensure efficient data handling, while the compact 114 × 104 mm form factor fits standard PCIe slots. With support for up to four cards per system, robust electrical design, and compliance with major communication standards, the COM-8524 is an ideal choice for engineers and system integrators seeking dependable serial expansion in modern computing environments.