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- Dual-Port Serial Interface: Provides 2 independent RS-422/RS-485 ports, allowing simultaneous communication with multiple serial devices.
- PCMCIA Type II Form Factor: Compact and portable design compatible with standard PCMCIA Type II slots, ideal for laptops and embedded systems.
- High-Performance UART: Equipped with a 16550C UART featuring a 16-byte FIFO buffer for each port, minimizing CPU load and preventing data loss during high-speed transmission.
- Industrial-Grade Reliability: Designed for stable operation in industrial and field environments, supporting long-distance and noise-resistant differential signaling.
- Flexible Serial Modes: Supports both RS-422 (full-duplex) and RS-485 (half-duplex or multi-drop) communication standards.
- Standard Connectors: Each port is terminated with a male DB9 connector, ensuring compatibility with standard serial cables and devices.
- Plug-and-Play Operation: Automatically recognized by PCMCIA-compliant systems, simplifying installation and configuration.
- Wide Application Range: Suitable for industrial automation, instrumentation, data acquisition, and communication with PLCs, sensors, and controllers.
- PCMCIA Type II Form Factor: Compact and portable design compatible with standard PCMCIA Type II slots, ideal for laptops and embedded systems.
- High-Performance UART: Equipped with a 16550C UART featuring a 16-byte FIFO buffer for each port, minimizing CPU load and preventing data loss during high-speed transmission.
- Industrial-Grade Reliability: Designed for stable operation in industrial and field environments, supporting long-distance and noise-resistant differential signaling.
- Flexible Serial Modes: Supports both RS-422 (full-duplex) and RS-485 (half-duplex or multi-drop) communication standards.
- Standard Connectors: Each port is terminated with a male DB9 connector, ensuring compatibility with standard serial cables and devices.
- Plug-and-Play Operation: Automatically recognized by PCMCIA-compliant systems, simplifying installation and configuration.
- Wide Application Range: Suitable for industrial automation, instrumentation, data acquisition, and communication with PLCs, sensors, and controllers.
1. Product Overview
Product Name: COMpad-85B-2
Model: COMpad-85B-2
Series: COMpad Industrial Communication Adapters
Article Number: COMpad-85B-2
Manufacturer: Moxa Technologies Co., Ltd.
The Moxa COMpad-85B-2 is a PCMCIA Type II serial communication interface card designed to provide reliable, high-performance serial connectivity for portable and embedded computing systems. It offers two independent RS-422/RS-485 serial ports through a compact PCMCIA Type II form factor, enabling industrial-grade serial communication for laptops, field devices, and embedded controllers that require robust data transmission over differential serial lines. The adapter integrates a 16550C UART with a 16-byte FIFO buffer, ensuring stable and efficient data flow even under high-speed or multi-device communication scenarios.
2. Key Features
- Dual-Port Serial Interface: Provides 2 independent RS-422/RS-485 ports, allowing simultaneous communication with multiple serial devices.
- PCMCIA Type II Form Factor: Compact and portable design compatible with standard PCMCIA Type II slots, ideal for laptops and embedded systems.
- High-Performance UART: Equipped with a 16550C UART featuring a 16-byte FIFO buffer for each port, minimizing CPU load and preventing data loss during high-speed transmission.
- Industrial-Grade Reliability: Designed for stable operation in industrial and field environments, supporting long-distance and noise-resistant differential signaling.
- Flexible Serial Modes: Supports both RS-422 (full-duplex) and RS-485 (half-duplex or multi-drop) communication standards.
- Standard Connectors: Each port is terminated with a male DB9 connector, ensuring compatibility with standard serial cables and devices.
- Plug-and-Play Operation: Automatically recognized by PCMCIA-compliant systems, simplifying installation and configuration.
- Wide Application Range: Suitable for industrial automation, instrumentation, data acquisition, and communication with PLCs, sensors, and controllers.
3. Technical Specifications
- Interface Type: PCMCIA Type II (CardBus-compatible)
- Serial Ports: 2 independent ports
- Serial Standards Supported: RS-422 and RS-485
- UART Type: 16550C or compatible
- FIFO Buffer: 16 bytes per channel
- Connector Type: 2 × DB9 male connectors
- Signal Lines (RS-422): TX+, TX−, RX+, RX−, GND
- Signal Lines (RS-485): Data+, Data−, GND
- Baud Rate: Typically supports up to 921.6 kbps (depending on host system and cable length)
- Bus Interface: PCMCIA 68-pin connector
- Form Factor: Type II PC Card (85.6 mm × 54.0 mm × 5.0 mm)
- Weight: Approximately 50–70 g (typical for PCMCIA cards)
- Material: Aluminum alloy housing with reinforced PCB for durability
- Power Consumption: Typically < 500 mW (from PCMCIA slot)
- 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
- LED Indicators: May include TX/RX activity indicators (depending on revision)
4. Functionality
The COMpad-85B-2 functions as a dual-channel serial communication adapter, converting the PCMCIA bus interface of a host computer into two independent RS-422/RS-485 serial ports. Each port operates through a dedicated UART channel, allowing full-duplex or half-duplex communication depending on the selected mode.
Operation:
- When inserted into a PCMCIA slot, the host system automatically detects the card and loads the appropriate driver.
- The card’s UARTs handle serial data transmission and reception, buffering data through the 16-byte FIFO to ensure smooth communication.
- RS-422 mode supports point-to-point full-duplex communication, while RS-485 mode supports multi-drop half-duplex networks with up to 32 nodes per bus segment.
Use Cases and Applications:
- Industrial Automation: Communication with PLCs, motor controllers, and distributed I/O modules.
- Data Acquisition Systems: Connection to sensors, transducers, and measurement instruments.
- Transportation and Infrastructure: Serial communication with ticketing systems, control panels, and monitoring devices.
- Embedded Systems: Integration into portable diagnostic tools, field service laptops, and embedded controllers requiring serial connectivity.
- Networking and Control: Linking RS-485-based devices such as Modbus RTU slaves, SCADA nodes, and building automation controllers.
Compatibility:
- Compatible with Windows, Linux, and other operating systems supporting PCMCIA serial drivers.
- Works with standard serial communication software and terminal emulators.
- Backward compatible with legacy RS-422/RS-485 devices.
5. Components & Accessories
Included Items:
- COMpad-85B-2 PCMCIA Type II card
- Dual-port breakout cable with two DB9 male connectors (if applicable)
- Driver and utility software (on CD or downloadable from Moxa website)
- Quick installation guide and documentation
Optional Accessories:
- DB9-to-terminal block adapters for field wiring
- Shielded serial cables for noise-sensitive environments
- PCMCIA-to-CardBus adapters for newer laptops
- Mounting brackets or protective cases for industrial use
Connectors:
- Host Interface: 68-pin PCMCIA connector
- Serial Interface: 2 × DB9 male connectors (RS-422/RS-485 configurable)
6. Installation & Setup
Requirements:
- Host system with an available PCMCIA Type II slot
- Supported operating system with appropriate driver support
- Administrative privileges for driver installation
Installation Steps:
1. Insert the COMpad-85B-2 card into the PCMCIA slot of the host computer.
2. The system detects the new hardware and prompts for driver installation.
3. Install the Moxa-provided driver package (available for Windows and Linux).
4. Configure each serial port through the device manager or configuration utility.
5. Connect serial devices to the DB9 connectors using appropriate cables.
6. Select RS-422 or RS-485 mode as required by the application.
Mounting Options:
- Direct insertion into PCMCIA slot (no external power required).
- Optional strain relief or cable retention clips for field use.
Configuration:
- Software-selectable communication parameters (baud rate, parity, stop bits, data bits).
- RS-485 mode may support automatic data direction control (driver enable/disable).
- Each port can be independently configured for RS-422 or RS-485 operation.
7. Performance & Capabilities
Speed and Throughput:
- Supports baud rates up to 921.6 kbps (typical maximum for 16550C UART).
- 16-byte FIFO buffers reduce CPU overhead and improve throughput.
- Reliable data transmission over long distances (up to 1200 m for RS-422, depending on cable quality).
Capacity:
- Two independent serial channels allow simultaneous communication with multiple devices.
- Each port can handle full-duplex or half-duplex communication depending on mode.
Efficiency:
- Hardware FIFO buffering minimizes data loss and ensures stable performance under high-load conditions.
- Low power consumption enables extended operation in portable systems.
Limitations:
- Limited to two serial ports per card.
- Requires PCMCIA slot (not compatible with USB or PCIe without adapters).
- Maximum baud rate and cable length depend on environmental conditions and cable characteristics.
8. Standards & Compliance
Electrical Standards:
- RS-422 (TIA/EIA-422-B)
- RS-485 (TIA/EIA-485-A)
- PCMCIA 2.1/JEIDA 4.2 compliant
Regulatory Compliance:
- CE (Conformité Européenne)
- FCC Part 15 Class B (for electromagnetic compatibility)
- RoHS compliant (Restriction of Hazardous Substances)
- WEEE directive compliant (Waste Electrical and Electronic Equipment)
Industry Standards:
- Compatible with Modbus RTU and other serial communication protocols.
- Meets industrial communication interface standards for reliability and signal integrity.
9. Additional Information
Warranty:
- Standard 3-year limited hardware warranty (typical for Moxa industrial products).
Support:
- Technical support available via Moxa’s global service network.
- Online resources include driver downloads, firmware updates, and configuration guides.
Maintenance:
- No regular maintenance required; periodic inspection of connectors and cables recommended.
- Firmware and driver updates available to maintain compatibility with new operating systems.
Updates and Lifecycle:
- Supported by Moxa’s long-term product availability policy, ensuring continuity for industrial applications.
- Backward-compatible with earlier COMpad series models for seamless integration into existing systems.
Summary:
The Moxa COMpad-85B-2 PCMCIA Type II Serial Interface is a compact, dual-port RS-422/RS-485 communication adapter engineered for industrial and embedded applications requiring reliable, high-speed serial connectivity. With its 16550C UART architecture, 16-byte FIFO buffering, and robust PCMCIA interface, it delivers stable, low-latency communication for a wide range of serial devices. Its compatibility with standard DB9 connectors, flexible configuration options, and compliance with major industrial standards make it a versatile solution for engineers, system integrators, and field technicians seeking dependable serial communication in portable or embedded environments.
Product Name: COMpad-85B-2
Model: COMpad-85B-2
Series: COMpad Industrial Communication Adapters
Article Number: COMpad-85B-2
Manufacturer: Moxa Technologies Co., Ltd.
The Moxa COMpad-85B-2 is a PCMCIA Type II serial communication interface card designed to provide reliable, high-performance serial connectivity for portable and embedded computing systems. It offers two independent RS-422/RS-485 serial ports through a compact PCMCIA Type II form factor, enabling industrial-grade serial communication for laptops, field devices, and embedded controllers that require robust data transmission over differential serial lines. The adapter integrates a 16550C UART with a 16-byte FIFO buffer, ensuring stable and efficient data flow even under high-speed or multi-device communication scenarios.
2. Key Features
- Dual-Port Serial Interface: Provides 2 independent RS-422/RS-485 ports, allowing simultaneous communication with multiple serial devices.
- PCMCIA Type II Form Factor: Compact and portable design compatible with standard PCMCIA Type II slots, ideal for laptops and embedded systems.
- High-Performance UART: Equipped with a 16550C UART featuring a 16-byte FIFO buffer for each port, minimizing CPU load and preventing data loss during high-speed transmission.
- Industrial-Grade Reliability: Designed for stable operation in industrial and field environments, supporting long-distance and noise-resistant differential signaling.
- Flexible Serial Modes: Supports both RS-422 (full-duplex) and RS-485 (half-duplex or multi-drop) communication standards.
- Standard Connectors: Each port is terminated with a male DB9 connector, ensuring compatibility with standard serial cables and devices.
- Plug-and-Play Operation: Automatically recognized by PCMCIA-compliant systems, simplifying installation and configuration.
- Wide Application Range: Suitable for industrial automation, instrumentation, data acquisition, and communication with PLCs, sensors, and controllers.
3. Technical Specifications
- Interface Type: PCMCIA Type II (CardBus-compatible)
- Serial Ports: 2 independent ports
- Serial Standards Supported: RS-422 and RS-485
- UART Type: 16550C or compatible
- FIFO Buffer: 16 bytes per channel
- Connector Type: 2 × DB9 male connectors
- Signal Lines (RS-422): TX+, TX−, RX+, RX−, GND
- Signal Lines (RS-485): Data+, Data−, GND
- Baud Rate: Typically supports up to 921.6 kbps (depending on host system and cable length)
- Bus Interface: PCMCIA 68-pin connector
- Form Factor: Type II PC Card (85.6 mm × 54.0 mm × 5.0 mm)
- Weight: Approximately 50–70 g (typical for PCMCIA cards)
- Material: Aluminum alloy housing with reinforced PCB for durability
- Power Consumption: Typically < 500 mW (from PCMCIA slot)
- 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
- LED Indicators: May include TX/RX activity indicators (depending on revision)
4. Functionality
The COMpad-85B-2 functions as a dual-channel serial communication adapter, converting the PCMCIA bus interface of a host computer into two independent RS-422/RS-485 serial ports. Each port operates through a dedicated UART channel, allowing full-duplex or half-duplex communication depending on the selected mode.
Operation:
- When inserted into a PCMCIA slot, the host system automatically detects the card and loads the appropriate driver.
- The card’s UARTs handle serial data transmission and reception, buffering data through the 16-byte FIFO to ensure smooth communication.
- RS-422 mode supports point-to-point full-duplex communication, while RS-485 mode supports multi-drop half-duplex networks with up to 32 nodes per bus segment.
Use Cases and Applications:
- Industrial Automation: Communication with PLCs, motor controllers, and distributed I/O modules.
- Data Acquisition Systems: Connection to sensors, transducers, and measurement instruments.
- Transportation and Infrastructure: Serial communication with ticketing systems, control panels, and monitoring devices.
- Embedded Systems: Integration into portable diagnostic tools, field service laptops, and embedded controllers requiring serial connectivity.
- Networking and Control: Linking RS-485-based devices such as Modbus RTU slaves, SCADA nodes, and building automation controllers.
Compatibility:
- Compatible with Windows, Linux, and other operating systems supporting PCMCIA serial drivers.
- Works with standard serial communication software and terminal emulators.
- Backward compatible with legacy RS-422/RS-485 devices.
5. Components & Accessories
Included Items:
- COMpad-85B-2 PCMCIA Type II card
- Dual-port breakout cable with two DB9 male connectors (if applicable)
- Driver and utility software (on CD or downloadable from Moxa website)
- Quick installation guide and documentation
Optional Accessories:
- DB9-to-terminal block adapters for field wiring
- Shielded serial cables for noise-sensitive environments
- PCMCIA-to-CardBus adapters for newer laptops
- Mounting brackets or protective cases for industrial use
Connectors:
- Host Interface: 68-pin PCMCIA connector
- Serial Interface: 2 × DB9 male connectors (RS-422/RS-485 configurable)
6. Installation & Setup
Requirements:
- Host system with an available PCMCIA Type II slot
- Supported operating system with appropriate driver support
- Administrative privileges for driver installation
Installation Steps:
1. Insert the COMpad-85B-2 card into the PCMCIA slot of the host computer.
2. The system detects the new hardware and prompts for driver installation.
3. Install the Moxa-provided driver package (available for Windows and Linux).
4. Configure each serial port through the device manager or configuration utility.
5. Connect serial devices to the DB9 connectors using appropriate cables.
6. Select RS-422 or RS-485 mode as required by the application.
Mounting Options:
- Direct insertion into PCMCIA slot (no external power required).
- Optional strain relief or cable retention clips for field use.
Configuration:
- Software-selectable communication parameters (baud rate, parity, stop bits, data bits).
- RS-485 mode may support automatic data direction control (driver enable/disable).
- Each port can be independently configured for RS-422 or RS-485 operation.
7. Performance & Capabilities
Speed and Throughput:
- Supports baud rates up to 921.6 kbps (typical maximum for 16550C UART).
- 16-byte FIFO buffers reduce CPU overhead and improve throughput.
- Reliable data transmission over long distances (up to 1200 m for RS-422, depending on cable quality).
Capacity:
- Two independent serial channels allow simultaneous communication with multiple devices.
- Each port can handle full-duplex or half-duplex communication depending on mode.
Efficiency:
- Hardware FIFO buffering minimizes data loss and ensures stable performance under high-load conditions.
- Low power consumption enables extended operation in portable systems.
Limitations:
- Limited to two serial ports per card.
- Requires PCMCIA slot (not compatible with USB or PCIe without adapters).
- Maximum baud rate and cable length depend on environmental conditions and cable characteristics.
8. Standards & Compliance
Electrical Standards:
- RS-422 (TIA/EIA-422-B)
- RS-485 (TIA/EIA-485-A)
- PCMCIA 2.1/JEIDA 4.2 compliant
Regulatory Compliance:
- CE (Conformité Européenne)
- FCC Part 15 Class B (for electromagnetic compatibility)
- RoHS compliant (Restriction of Hazardous Substances)
- WEEE directive compliant (Waste Electrical and Electronic Equipment)
Industry Standards:
- Compatible with Modbus RTU and other serial communication protocols.
- Meets industrial communication interface standards for reliability and signal integrity.
9. Additional Information
Warranty:
- Standard 3-year limited hardware warranty (typical for Moxa industrial products).
Support:
- Technical support available via Moxa’s global service network.
- Online resources include driver downloads, firmware updates, and configuration guides.
Maintenance:
- No regular maintenance required; periodic inspection of connectors and cables recommended.
- Firmware and driver updates available to maintain compatibility with new operating systems.
Updates and Lifecycle:
- Supported by Moxa’s long-term product availability policy, ensuring continuity for industrial applications.
- Backward-compatible with earlier COMpad series models for seamless integration into existing systems.
Summary:
The Moxa COMpad-85B-2 PCMCIA Type II Serial Interface is a compact, dual-port RS-422/RS-485 communication adapter engineered for industrial and embedded applications requiring reliable, high-speed serial connectivity. With its 16550C UART architecture, 16-byte FIFO buffering, and robust PCMCIA interface, it delivers stable, low-latency communication for a wide range of serial devices. Its compatibility with standard DB9 connectors, flexible configuration options, and compliance with major industrial standards make it a versatile solution for engineers, system integrators, and field technicians seeking dependable serial communication in portable or embedded environments.
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