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- Four Independent Serial Ports: Provides 4 channels of RS-422/RS-485 communication through a single PCMCIA Type II interface card.
- PCMCIA Type II Form Factor: Compact and portable design suitable for notebook computers, embedded systems, and industrial controllers with PCMCIA slots.
- High-Performance UART: Each port is equipped with a 16550C-compatible UART featuring a 16-byte FIFO buffer, enabling efficient data handling and minimizing data loss during high-speed transmission.
- RS-422/RS-485 Compatibility: Supports both RS-422 (differential, full-duplex) and RS-485 (differential, half-duplex) communication standards, allowing flexible integration with a wide range of industrial devices such as PLCs, sensors, and controllers.
- DB9 Male Connectors: Each serial port terminates in a male DB9 connector, providing a standard interface for industrial serial communication cables and devices.
- Industrial-Grade Reliability: Designed for stable operation in demanding environments, ensuring consistent performance in field applications.
- Plug-and-Play Operation: Compatible with PCMCIA standards for easy installation and automatic system recognition.
- Multi-Drop Networking Support: RS-485 mode allows connection of multiple devices on a single bus, ideal for distributed control systems.
- Low Power Consumption: Optimized for mobile and embedded systems where power efficiency is critical.
- Driver Support: Compatible with major operating systems supporting PCMCIA serial interfaces (e.g., Windows, Linux, and legacy DOS environments).
- PCMCIA Type II Form Factor: Compact and portable design suitable for notebook computers, embedded systems, and industrial controllers with PCMCIA slots.
- High-Performance UART: Each port is equipped with a 16550C-compatible UART featuring a 16-byte FIFO buffer, enabling efficient data handling and minimizing data loss during high-speed transmission.
- RS-422/RS-485 Compatibility: Supports both RS-422 (differential, full-duplex) and RS-485 (differential, half-duplex) communication standards, allowing flexible integration with a wide range of industrial devices such as PLCs, sensors, and controllers.
- DB9 Male Connectors: Each serial port terminates in a male DB9 connector, providing a standard interface for industrial serial communication cables and devices.
- Industrial-Grade Reliability: Designed for stable operation in demanding environments, ensuring consistent performance in field applications.
- Plug-and-Play Operation: Compatible with PCMCIA standards for easy installation and automatic system recognition.
- Multi-Drop Networking Support: RS-485 mode allows connection of multiple devices on a single bus, ideal for distributed control systems.
- Low Power Consumption: Optimized for mobile and embedded systems where power efficiency is critical.
- Driver Support: Compatible with major operating systems supporting PCMCIA serial interfaces (e.g., Windows, Linux, and legacy DOS environments).
1. Product Overview
Product Name: COMpad-85B-4
Model: COMpad-85B-4
Series: COMpad Industrial Communication Series
Article Number: COMpad-85B-4
Manufacturer: Moxa Technologies Co., Ltd.
The Moxa COMpad-85B-4 is a PCMCIA Type II serial communication interface card designed to provide four independent RS-422/RS-485 serial ports for industrial, embedded, and mobile computing applications. It is engineered for users who require reliable, high-performance serial connectivity in compact or portable systems such as laptops, field service computers, and industrial controllers equipped with PCMCIA slots. The device integrates a 16-byte FIFO UART (16550C-compatible) for each port, ensuring stable data transmission and reduced CPU load during high-speed serial communication.
2. Key Features
- Four Independent Serial Ports: Provides 4 channels of RS-422/RS-485 communication through a single PCMCIA Type II interface card.
- PCMCIA Type II Form Factor: Compact and portable design suitable for notebook computers, embedded systems, and industrial controllers with PCMCIA slots.
- High-Performance UART: Each port is equipped with a 16550C-compatible UART featuring a 16-byte FIFO buffer, enabling efficient data handling and minimizing data loss during high-speed transmission.
- RS-422/RS-485 Compatibility: Supports both RS-422 (differential, full-duplex) and RS-485 (differential, half-duplex) communication standards, allowing flexible integration with a wide range of industrial devices such as PLCs, sensors, and controllers.
- DB9 Male Connectors: Each serial port terminates in a male DB9 connector, providing a standard interface for industrial serial communication cables and devices.
- Industrial-Grade Reliability: Designed for stable operation in demanding environments, ensuring consistent performance in field applications.
- Plug-and-Play Operation: Compatible with PCMCIA standards for easy installation and automatic system recognition.
- Multi-Drop Networking Support: RS-485 mode allows connection of multiple devices on a single bus, ideal for distributed control systems.
- Low Power Consumption: Optimized for mobile and embedded systems where power efficiency is critical.
- Driver Support: Compatible with major operating systems supporting PCMCIA serial interfaces (e.g., Windows, Linux, and legacy DOS environments).
3. Technical Specifications
- Interface Type: PCMCIA Type II (CardBus-compatible)
- Serial Ports: 4 independent ports
- Communication Standards: RS-422 / RS-485 (software-selectable or hardware-configurable depending on system setup)
- UART Type: 16550C-compatible UART with 16-byte FIFO per port
- Connector Type: 4 × DB9 male connectors (via breakout cable or integrated connector assembly)
- Baud Rate: Up to 921.6 kbps (typical for 16550C-based interfaces; actual rate dependent on host system and cable length)
- Data Bits: 5, 6, 7, or 8 bits
- Stop Bits: 1 or 2
- Parity: None, Even, Odd, Mark, or Space
- Flow Control: Software (XON/XOFF) and hardware (RTS/CTS) flow control supported
- Signal Lines (RS-422): TX+, TX−, RX+, RX−, GND
- Signal Lines (RS-485): Data+, Data−, GND
- Bus Loading (RS-485): Up to 32 nodes per bus segment (standard RS-485 specification)
- Isolation: Typically non-isolated (external isolation modules optional)
- Power Supply: Supplied via PCMCIA slot (5 V DC nominal)
- Power Consumption: Approx. 300–500 mW (typical)
- Dimensions: PCMCIA Type II standard (approx. 85.6 mm × 54.0 mm × 5.0 mm)
- Weight: Approx. 50–70 g (depending on connector assembly)
- Material: Aluminum alloy or reinforced plastic housing with EMI shielding
- Operating Temperature: 0°C to 55°C (standard); extended temperature versions may be available
- Storage Temperature: −20°C to 85°C
- Humidity: 5% to 95% RH, non-condensing
4. Functionality
The COMpad-85B-4 functions as a multi-port serial communication adapter that expands a host system’s connectivity through the PCMCIA interface. Once inserted into a compatible PCMCIA slot, the card is automatically detected by the operating system and configured as four independent serial COM ports.
Each port can be individually configured for RS-422 or RS-485 operation, enabling communication with a wide range of industrial devices. In RS-422 mode, the card supports full-duplex communication, allowing simultaneous transmission and reception. In RS-485 mode, it supports half-duplex communication suitable for multi-drop networks where multiple devices share the same communication bus.
Typical Use Cases and Applications:
- Industrial automation and control systems
- Data acquisition and monitoring
- SCADA (Supervisory Control and Data Acquisition) systems
- Field service and maintenance tools
- Laboratory instrumentation
- Serial device networking for sensors, PLCs, and controllers
- Mobile computing environments requiring serial connectivity
Compatibility:
- Compatible with PCMCIA Type II slots on laptops, embedded PCs, and industrial controllers.
- Supported by operating systems with PCMCIA serial driver support (Windows, Linux, DOS, and others).
- Works with standard serial communication software and terminal emulators.
5. Components & Accessories
Included Items:
- COMpad-85B-4 PCMCIA Type II card
- 4-port DB9 male connector breakout cable (if applicable)
- User manual or quick installation guide
- Driver and utility software (on CD-ROM or downloadable from manufacturer’s website)
Optional Accessories:
- RS-422/RS-485 isolation adapters
- DB9-to-terminal block adapters for field wiring
- Extended-length serial cables
- PCMCIA-to-CardBus adapters for newer systems
- Mounting brackets or cable strain relief accessories
Connectors:
- Each port uses a DB9 male connector, providing standard pin assignments for RS-422/RS-485 communication.
- The breakout cable may terminate in a single high-density connector on the card side, branching into four DB9 connectors for device connections.
6. Installation & Setup
Requirements:
- Host system with an available PCMCIA Type II slot
- Supported operating system with PCMCIA driver support
- Administrative privileges for driver installation
Installation Steps:
1. Power off the host system (if required by the operating system).
2. Insert the COMpad-85B-4 card into the PCMCIA slot until it is firmly seated.
3. Power on the system; the operating system should detect the new hardware automatically.
4. Install the provided driver software if not automatically recognized.
5. Verify that four new COM ports appear in the system device manager or equivalent interface.
6. Configure each port for RS-422 or RS-485 mode as required by the application.
7. Connect the DB9 connectors to the target devices using appropriate serial cables.
Mounting Options:
- Direct insertion into PCMCIA slot (no external mounting required).
- Optional cable strain relief or bracket mounting for industrial environments.
Configuration:
- Software configuration via driver utility or operating system device manager.
- Baud rate, parity, data bits, and stop bits configurable per port.
- RS-422/RS-485 mode selection may be hardware jumper or software-controlled depending on version.
7. Performance & Capabilities
The COMpad-85B-4 delivers robust serial communication performance suitable for industrial and mobile applications. The integrated 16550C UART with 16-byte FIFO ensures smooth data flow even at high baud rates, reducing CPU overhead and preventing data loss.
Speed and Throughput:
- Supports baud rates up to 921.6 kbps (typical maximum for 16550C UARTs).
- Reliable operation across long cable runs (up to 1200 meters for RS-422/RS-485 under standard conditions).
Capacity:
- Four independent serial channels allow simultaneous communication with multiple devices.
- Each channel operates independently with configurable parameters.
Efficiency:
- FIFO buffering minimizes interrupt load on the host CPU.
- Low power consumption ensures minimal impact on battery-powered systems.
Limitations:
- Limited to PCMCIA Type II interface; not directly compatible with modern USB or PCIe systems without adapters.
- Non-isolated design may require external isolation for high-noise environments.
- RS-485 multi-drop limited to 32 nodes per segment (standard limitation).
8. Standards & Compliance
Interface Standards:
- PCMCIA Type II (JEIDA/PCMCIA 2.1 compliant)
- RS-422 (EIA/TIA-422-B standard)
- RS-485 (EIA/TIA-485-A standard)
Electrical and Safety Compliance:
- CE compliant (EMC Directive)
- FCC Class B compliant (for electromagnetic interference)
- RoHS compliant (Restriction of Hazardous Substances)
Industry Standards:
- UART 16550C compatibility ensures interoperability with standard serial communication software and drivers.
- Designed for industrial communication protocols such as Modbus RTU, DNP3, and proprietary serial protocols.
9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 3 years, depending on region and distributor).
Technical Support:
- Comprehensive technical documentation, driver downloads, and FAQs available from Moxa’s official support portal.
- Email and phone-based technical assistance for configuration and troubleshooting.
Maintenance:
- No regular maintenance required beyond ensuring clean connector contacts.
- Firmware and driver updates available periodically to maintain compatibility with new operating systems.
Software Updates:
- Updated drivers and utilities can be downloaded from the manufacturer’s website.
- Backward compatibility maintained with legacy operating systems.
Service Life and Reliability:
- Designed for long-term industrial operation with high mean time between failures (MTBF).
- Rugged construction ensures durability in mobile and field environments.
Summary
The Moxa COMpad-85B-4 PCMCIA Type II Serial Interface Card is a compact, high-performance solution for adding four RS-422/RS-485 serial ports to portable or embedded systems. With its 16550C-compatible UARTs, robust industrial design, and flexible configuration options, it provides reliable serial communication for a wide range of industrial and field applications. Its adherence to PCMCIA, RS-422, and RS-485 standards ensures broad compatibility, while Moxa’s reputation for quality and support guarantees dependable operation throughout the product’s lifecycle.
In essence, the COMpad-85B-4 bridges the gap between modern computing platforms and legacy serial devices, offering a stable, efficient, and portable communication interface for industrial automation, data acquisition, and control systems.
Product Name: COMpad-85B-4
Model: COMpad-85B-4
Series: COMpad Industrial Communication Series
Article Number: COMpad-85B-4
Manufacturer: Moxa Technologies Co., Ltd.
The Moxa COMpad-85B-4 is a PCMCIA Type II serial communication interface card designed to provide four independent RS-422/RS-485 serial ports for industrial, embedded, and mobile computing applications. It is engineered for users who require reliable, high-performance serial connectivity in compact or portable systems such as laptops, field service computers, and industrial controllers equipped with PCMCIA slots. The device integrates a 16-byte FIFO UART (16550C-compatible) for each port, ensuring stable data transmission and reduced CPU load during high-speed serial communication.
2. Key Features
- Four Independent Serial Ports: Provides 4 channels of RS-422/RS-485 communication through a single PCMCIA Type II interface card.
- PCMCIA Type II Form Factor: Compact and portable design suitable for notebook computers, embedded systems, and industrial controllers with PCMCIA slots.
- High-Performance UART: Each port is equipped with a 16550C-compatible UART featuring a 16-byte FIFO buffer, enabling efficient data handling and minimizing data loss during high-speed transmission.
- RS-422/RS-485 Compatibility: Supports both RS-422 (differential, full-duplex) and RS-485 (differential, half-duplex) communication standards, allowing flexible integration with a wide range of industrial devices such as PLCs, sensors, and controllers.
- DB9 Male Connectors: Each serial port terminates in a male DB9 connector, providing a standard interface for industrial serial communication cables and devices.
- Industrial-Grade Reliability: Designed for stable operation in demanding environments, ensuring consistent performance in field applications.
- Plug-and-Play Operation: Compatible with PCMCIA standards for easy installation and automatic system recognition.
- Multi-Drop Networking Support: RS-485 mode allows connection of multiple devices on a single bus, ideal for distributed control systems.
- Low Power Consumption: Optimized for mobile and embedded systems where power efficiency is critical.
- Driver Support: Compatible with major operating systems supporting PCMCIA serial interfaces (e.g., Windows, Linux, and legacy DOS environments).
3. Technical Specifications
- Interface Type: PCMCIA Type II (CardBus-compatible)
- Serial Ports: 4 independent ports
- Communication Standards: RS-422 / RS-485 (software-selectable or hardware-configurable depending on system setup)
- UART Type: 16550C-compatible UART with 16-byte FIFO per port
- Connector Type: 4 × DB9 male connectors (via breakout cable or integrated connector assembly)
- Baud Rate: Up to 921.6 kbps (typical for 16550C-based interfaces; actual rate dependent on host system and cable length)
- Data Bits: 5, 6, 7, or 8 bits
- Stop Bits: 1 or 2
- Parity: None, Even, Odd, Mark, or Space
- Flow Control: Software (XON/XOFF) and hardware (RTS/CTS) flow control supported
- Signal Lines (RS-422): TX+, TX−, RX+, RX−, GND
- Signal Lines (RS-485): Data+, Data−, GND
- Bus Loading (RS-485): Up to 32 nodes per bus segment (standard RS-485 specification)
- Isolation: Typically non-isolated (external isolation modules optional)
- Power Supply: Supplied via PCMCIA slot (5 V DC nominal)
- Power Consumption: Approx. 300–500 mW (typical)
- Dimensions: PCMCIA Type II standard (approx. 85.6 mm × 54.0 mm × 5.0 mm)
- Weight: Approx. 50–70 g (depending on connector assembly)
- Material: Aluminum alloy or reinforced plastic housing with EMI shielding
- Operating Temperature: 0°C to 55°C (standard); extended temperature versions may be available
- Storage Temperature: −20°C to 85°C
- Humidity: 5% to 95% RH, non-condensing
4. Functionality
The COMpad-85B-4 functions as a multi-port serial communication adapter that expands a host system’s connectivity through the PCMCIA interface. Once inserted into a compatible PCMCIA slot, the card is automatically detected by the operating system and configured as four independent serial COM ports.
Each port can be individually configured for RS-422 or RS-485 operation, enabling communication with a wide range of industrial devices. In RS-422 mode, the card supports full-duplex communication, allowing simultaneous transmission and reception. In RS-485 mode, it supports half-duplex communication suitable for multi-drop networks where multiple devices share the same communication bus.
Typical Use Cases and Applications:
- Industrial automation and control systems
- Data acquisition and monitoring
- SCADA (Supervisory Control and Data Acquisition) systems
- Field service and maintenance tools
- Laboratory instrumentation
- Serial device networking for sensors, PLCs, and controllers
- Mobile computing environments requiring serial connectivity
Compatibility:
- Compatible with PCMCIA Type II slots on laptops, embedded PCs, and industrial controllers.
- Supported by operating systems with PCMCIA serial driver support (Windows, Linux, DOS, and others).
- Works with standard serial communication software and terminal emulators.
5. Components & Accessories
Included Items:
- COMpad-85B-4 PCMCIA Type II card
- 4-port DB9 male connector breakout cable (if applicable)
- User manual or quick installation guide
- Driver and utility software (on CD-ROM or downloadable from manufacturer’s website)
Optional Accessories:
- RS-422/RS-485 isolation adapters
- DB9-to-terminal block adapters for field wiring
- Extended-length serial cables
- PCMCIA-to-CardBus adapters for newer systems
- Mounting brackets or cable strain relief accessories
Connectors:
- Each port uses a DB9 male connector, providing standard pin assignments for RS-422/RS-485 communication.
- The breakout cable may terminate in a single high-density connector on the card side, branching into four DB9 connectors for device connections.
6. Installation & Setup
Requirements:
- Host system with an available PCMCIA Type II slot
- Supported operating system with PCMCIA driver support
- Administrative privileges for driver installation
Installation Steps:
1. Power off the host system (if required by the operating system).
2. Insert the COMpad-85B-4 card into the PCMCIA slot until it is firmly seated.
3. Power on the system; the operating system should detect the new hardware automatically.
4. Install the provided driver software if not automatically recognized.
5. Verify that four new COM ports appear in the system device manager or equivalent interface.
6. Configure each port for RS-422 or RS-485 mode as required by the application.
7. Connect the DB9 connectors to the target devices using appropriate serial cables.
Mounting Options:
- Direct insertion into PCMCIA slot (no external mounting required).
- Optional cable strain relief or bracket mounting for industrial environments.
Configuration:
- Software configuration via driver utility or operating system device manager.
- Baud rate, parity, data bits, and stop bits configurable per port.
- RS-422/RS-485 mode selection may be hardware jumper or software-controlled depending on version.
7. Performance & Capabilities
The COMpad-85B-4 delivers robust serial communication performance suitable for industrial and mobile applications. The integrated 16550C UART with 16-byte FIFO ensures smooth data flow even at high baud rates, reducing CPU overhead and preventing data loss.
Speed and Throughput:
- Supports baud rates up to 921.6 kbps (typical maximum for 16550C UARTs).
- Reliable operation across long cable runs (up to 1200 meters for RS-422/RS-485 under standard conditions).
Capacity:
- Four independent serial channels allow simultaneous communication with multiple devices.
- Each channel operates independently with configurable parameters.
Efficiency:
- FIFO buffering minimizes interrupt load on the host CPU.
- Low power consumption ensures minimal impact on battery-powered systems.
Limitations:
- Limited to PCMCIA Type II interface; not directly compatible with modern USB or PCIe systems without adapters.
- Non-isolated design may require external isolation for high-noise environments.
- RS-485 multi-drop limited to 32 nodes per segment (standard limitation).
8. Standards & Compliance
Interface Standards:
- PCMCIA Type II (JEIDA/PCMCIA 2.1 compliant)
- RS-422 (EIA/TIA-422-B standard)
- RS-485 (EIA/TIA-485-A standard)
Electrical and Safety Compliance:
- CE compliant (EMC Directive)
- FCC Class B compliant (for electromagnetic interference)
- RoHS compliant (Restriction of Hazardous Substances)
Industry Standards:
- UART 16550C compatibility ensures interoperability with standard serial communication software and drivers.
- Designed for industrial communication protocols such as Modbus RTU, DNP3, and proprietary serial protocols.
9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 3 years, depending on region and distributor).
Technical Support:
- Comprehensive technical documentation, driver downloads, and FAQs available from Moxa’s official support portal.
- Email and phone-based technical assistance for configuration and troubleshooting.
Maintenance:
- No regular maintenance required beyond ensuring clean connector contacts.
- Firmware and driver updates available periodically to maintain compatibility with new operating systems.
Software Updates:
- Updated drivers and utilities can be downloaded from the manufacturer’s website.
- Backward compatibility maintained with legacy operating systems.
Service Life and Reliability:
- Designed for long-term industrial operation with high mean time between failures (MTBF).
- Rugged construction ensures durability in mobile and field environments.
Summary
The Moxa COMpad-85B-4 PCMCIA Type II Serial Interface Card is a compact, high-performance solution for adding four RS-422/RS-485 serial ports to portable or embedded systems. With its 16550C-compatible UARTs, robust industrial design, and flexible configuration options, it provides reliable serial communication for a wide range of industrial and field applications. Its adherence to PCMCIA, RS-422, and RS-485 standards ensures broad compatibility, while Moxa’s reputation for quality and support guarantees dependable operation throughout the product’s lifecycle.
In essence, the COMpad-85B-4 bridges the gap between modern computing platforms and legacy serial devices, offering a stable, efficient, and portable communication interface for industrial automation, data acquisition, and control systems.
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