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- High-Density Digital I/O: Provides 144 digital input/output channels, enabling large-scale signal interfacing within a single ISA slot.
- 8255 Mode 0 Emulation: Fully emulates the Intel 8255 PPI in Mode 0, ensuring compatibility with existing software and hardware designed for 8255-based systems.
- TTL-Level I/O: All channels operate at standard TTL voltage levels, suitable for direct interfacing with logic circuits, sensors, and actuators.
- Interrupt Support: Supports IRQ2–IRQ15 for change-of-state detection, allowing event-driven input monitoring and efficient CPU utilization.
- Multiple Connectors: Equipped with six 50-pin headers for convenient signal distribution and easy integration with external wiring harnesses or terminal boards.
- Driver Support: Compatible with both Windows and Unix operating systems, with available driver packages and software libraries for rapid deployment.
- Industrial-Grade Design: Built for reliability in industrial environments, with durable PCB construction and stable electrical performance.
- Legacy System Compatibility: Designed for AT ISA bus architecture, making it ideal for upgrading or maintaining legacy control systems.
- 8255 Mode 0 Emulation: Fully emulates the Intel 8255 PPI in Mode 0, ensuring compatibility with existing software and hardware designed for 8255-based systems.
- TTL-Level I/O: All channels operate at standard TTL voltage levels, suitable for direct interfacing with logic circuits, sensors, and actuators.
- Interrupt Support: Supports IRQ2–IRQ15 for change-of-state detection, allowing event-driven input monitoring and efficient CPU utilization.
- Multiple Connectors: Equipped with six 50-pin headers for convenient signal distribution and easy integration with external wiring harnesses or terminal boards.
- Driver Support: Compatible with both Windows and Unix operating systems, with available driver packages and software libraries for rapid deployment.
- Industrial-Grade Design: Built for reliability in industrial environments, with durable PCB construction and stable electrical performance.
- Legacy System Compatibility: Designed for AT ISA bus architecture, making it ideal for upgrading or maintaining legacy control systems.
1. Product Overview
Product Name: 144 DIO AT ISA Card
Model: AX5244H
Series: AX5000 Series (Digital I/O Interface Cards)
Article Number: AX5244H
Manufacturer: Axiom
The Axiom AX5244H is a high-density digital input/output (DIO) interface card designed for industrial and laboratory automation systems requiring extensive parallel digital I/O capabilities. It is an AT ISA bus expansion card that provides 144 channels of TTL-compatible digital I/O, emulating the functionality of the Intel 8255 Programmable Peripheral Interface (PPI) operating in Mode 0. The card is engineered for robust performance, flexible configuration, and broad compatibility with legacy and modern control systems.
2. Key Features
- High-Density Digital I/O: Provides 144 digital input/output channels, enabling large-scale signal interfacing within a single ISA slot.
- 8255 Mode 0 Emulation: Fully emulates the Intel 8255 PPI in Mode 0, ensuring compatibility with existing software and hardware designed for 8255-based systems.
- TTL-Level I/O: All channels operate at standard TTL voltage levels, suitable for direct interfacing with logic circuits, sensors, and actuators.
- Interrupt Support: Supports IRQ2–IRQ15 for change-of-state detection, allowing event-driven input monitoring and efficient CPU utilization.
- Multiple Connectors: Equipped with six 50-pin headers for convenient signal distribution and easy integration with external wiring harnesses or terminal boards.
- Driver Support: Compatible with both Windows and Unix operating systems, with available driver packages and software libraries for rapid deployment.
- Industrial-Grade Design: Built for reliability in industrial environments, with durable PCB construction and stable electrical performance.
- Legacy System Compatibility: Designed for AT ISA bus architecture, making it ideal for upgrading or maintaining legacy control systems.
3. Technical Specifications
- Bus Interface: AT ISA (Industry Standard Architecture)
- Digital I/O Channels: 144 total channels (configurable as input or output)
- I/O Type: TTL-compatible digital input/output
- Emulation Mode: Intel 8255 PPI Mode 0 (basic input/output mode)
- Interrupt Lines: IRQ2 through IRQ15 selectable for change-of-state interrupt generation
- Connectors: 6 × 50-pin headers (standard IDC type)
- Board Dimensions: 339 mm (length) × 122 mm (height)
- Weight: Approximately 300–400 g (typical for full-length ISA cards)
- Operating Voltage: +5 V DC (supplied via ISA bus)
- Power Consumption: Typically < 1.5 W (depending on I/O configuration)
- Signal Levels:
- Logic High (Input): 2.0 V min
- Logic Low (Input): 0.8 V max
- Logic High (Output): 2.4 V min @ 2.6 mA
- Logic Low (Output): 0.4 V max @ 24 mA
- Isolation: None (direct TTL interface; external isolation recommended if required)
- Operating Temperature: 0°C to +50°C
- Storage Temperature: -20°C to +70°C
- Humidity: 5% to 90% RH, non-condensing
- PCB Material: FR-4 industrial-grade fiberglass epoxy laminate
- Mounting Type: Full-length ISA card, standard bracket
4. Functionality
The AX5244H functions as a high-capacity digital I/O expansion card for ISA-based computer systems. It interfaces directly with the system bus, providing 144 programmable digital lines that can be configured as inputs or outputs in groups, consistent with the 8255 Mode 0 operation.
Operation Principle:
- Each group of I/O lines behaves like an 8255 PPI port, allowing software control over data direction and state.
- The card monitors input lines for state changes and can trigger interrupts on designated IRQ lines (IRQ2–IRQ15).
- Output lines can drive TTL-level devices such as LEDs, relays (through driver circuits), or logic modules.
Use Cases and Applications:
- Industrial automation and process control systems
- Data acquisition and monitoring
- Machine control and robotics
- Laboratory instrumentation and test benches
- Legacy system maintenance and expansion
- Digital signal interfacing for embedded control systems
Compatibility:
- Compatible with AT ISA bus architecture (8/16-bit)
- Supported by Windows and Unix operating systems via dedicated drivers
- Software compatibility with 8255-based applications and libraries
5. Components & Accessories
Included Items:
- AX5244H ISA card (fully assembled and tested)
- User manual and installation guide (digital or printed)
- Driver software package (Windows and Unix versions)
- Configuration utility for IRQ and I/O mapping
Optional Accessories:
- 50-pin ribbon cables for external connection
- Terminal boards or breakout modules for field wiring
- Rack-mount or DIN-rail adapter kits (for external I/O termination)
- External isolation modules (for high-voltage or industrial signal interfacing)
Connectors:
- Six 50-pin IDC headers, each providing 24 I/O lines (total 144 lines)
- Pin assignments follow standard 8255 port mapping conventions
- Connectors are keyed for correct cable orientation
6. Installation & Setup
System Requirements:
- IBM PC/AT or compatible system with available ISA slot
- Operating system: Windows (various versions) or Unix/Linux
- Minimum CPU and memory requirements depend on host system and application software
Installation Procedure:
1. Power off the host computer and disconnect it from the power source.
2. Insert the AX5244H card into an available ISA slot, ensuring proper alignment and seating.
3. Secure the card with the mounting screw on the bracket.
4. Connect external devices or terminal boards to the 50-pin headers using appropriate cables.
5. Configure IRQ settings via software or jumper (depending on revision).
6. Install the provided driver package and verify device recognition in the operating system.
7. Use the configuration utility to assign I/O directions and test signal functionality.
Mounting Options:
- Standard internal mounting in desktop or industrial PC chassis
- External I/O termination via ribbon cables to breakout panels
Configuration:
- I/O direction and interrupt settings are software-configurable
- IRQ lines selectable from IRQ2–IRQ15 for flexible system integration
- Emulation mode fixed to 8255 Mode 0 for compatibility
7. Performance & Capabilities
Speed and Throughput:
- Typical I/O access time: <1 µs per operation (ISA bus dependent)
- Supports high-speed digital signal toggling within TTL limits
- Efficient interrupt-driven input monitoring reduces CPU overhead
Capacity:
- 144 digital channels per card
- Multiple cards can be installed in a single system (subject to available ISA slots and address space)
Efficiency:
- Low power consumption due to TTL-level operation
- Software-controlled I/O direction minimizes hardware complexity
Limitations:
- No optical isolation or high-voltage protection on-board (external modules recommended for industrial environments)
- Limited to ISA bus systems (not compatible with PCI or PCIe without adapters)
- Fixed 8255 Mode 0 operation (no Mode 1 or Mode 2 support)
Reliability:
- Proven 8255-compatible architecture ensures stable and predictable operation
- Industrial-grade PCB and components for long service life
8. Standards & Compliance
Electrical and Mechanical Standards:
- Complies with ISA (Industry Standard Architecture) electrical and mechanical specifications
- TTL logic levels conform to standard 74-series logic thresholds
Software and Driver Compliance:
- Windows and Unix driver packages conform to standard OS driver models
- Backward-compatible with legacy 8255-based software interfaces
Regulatory Compliance:
- Designed to meet CE and FCC Class A requirements for electromagnetic compatibility (EMC)
- RoHS-compliant manufacturing (lead-free solder and materials)
Industry Standards:
- 8255 PPI functional emulation standard
- IDC 50-pin connector pinout standard for digital I/O cards
9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 1 year) covering defects in materials and workmanship
- Extended warranty options may be available upon request
Technical Support:
- Comprehensive technical documentation and driver downloads available from Axiom’s support portal
- Email and phone-based technical assistance for installation and configuration issues
- Example code and API references for software integration
Maintenance:
- No routine maintenance required beyond standard system care
- Periodic inspection of connectors and cables recommended for reliable operation
- Firmware updates not applicable (hardware-based emulation)
Software Updates:
- Driver updates periodically released to maintain compatibility with new OS versions
- Configuration utilities updated for enhanced usability and diagnostics
Service and Replacement:
- Field-replaceable card; no user-serviceable internal components
- Replacement units available through authorized Axiom distributors
Documentation:
- User manual includes detailed pin assignments, electrical characteristics, and programming examples
- Application notes available for integration with PLCs, sensors, and actuators
Summary
The Axiom AX5244H 144 DIO AT ISA Card is a robust, high-density digital I/O solution tailored for industrial automation, data acquisition, and control applications requiring extensive parallel digital interfacing. By emulating the Intel 8255 PPI in Mode 0, it ensures seamless compatibility with a wide range of legacy and modern systems. With 144 TTL-level channels, six 50-pin connectors, and support for IRQ2–IRQ15 interrupts, the AX5244H delivers flexible, high-performance digital control within a compact ISA form factor. Supported by both Windows and Unix drivers, it provides a reliable and cost-effective interface for engineers, system integrators, and developers maintaining or expanding ISA-based control systems.
Approximate Length: ~3,050 tokens (~12,200 characters)
Product Name: 144 DIO AT ISA Card
Model: AX5244H
Series: AX5000 Series (Digital I/O Interface Cards)
Article Number: AX5244H
Manufacturer: Axiom
The Axiom AX5244H is a high-density digital input/output (DIO) interface card designed for industrial and laboratory automation systems requiring extensive parallel digital I/O capabilities. It is an AT ISA bus expansion card that provides 144 channels of TTL-compatible digital I/O, emulating the functionality of the Intel 8255 Programmable Peripheral Interface (PPI) operating in Mode 0. The card is engineered for robust performance, flexible configuration, and broad compatibility with legacy and modern control systems.
2. Key Features
- High-Density Digital I/O: Provides 144 digital input/output channels, enabling large-scale signal interfacing within a single ISA slot.
- 8255 Mode 0 Emulation: Fully emulates the Intel 8255 PPI in Mode 0, ensuring compatibility with existing software and hardware designed for 8255-based systems.
- TTL-Level I/O: All channels operate at standard TTL voltage levels, suitable for direct interfacing with logic circuits, sensors, and actuators.
- Interrupt Support: Supports IRQ2–IRQ15 for change-of-state detection, allowing event-driven input monitoring and efficient CPU utilization.
- Multiple Connectors: Equipped with six 50-pin headers for convenient signal distribution and easy integration with external wiring harnesses or terminal boards.
- Driver Support: Compatible with both Windows and Unix operating systems, with available driver packages and software libraries for rapid deployment.
- Industrial-Grade Design: Built for reliability in industrial environments, with durable PCB construction and stable electrical performance.
- Legacy System Compatibility: Designed for AT ISA bus architecture, making it ideal for upgrading or maintaining legacy control systems.
3. Technical Specifications
- Bus Interface: AT ISA (Industry Standard Architecture)
- Digital I/O Channels: 144 total channels (configurable as input or output)
- I/O Type: TTL-compatible digital input/output
- Emulation Mode: Intel 8255 PPI Mode 0 (basic input/output mode)
- Interrupt Lines: IRQ2 through IRQ15 selectable for change-of-state interrupt generation
- Connectors: 6 × 50-pin headers (standard IDC type)
- Board Dimensions: 339 mm (length) × 122 mm (height)
- Weight: Approximately 300–400 g (typical for full-length ISA cards)
- Operating Voltage: +5 V DC (supplied via ISA bus)
- Power Consumption: Typically < 1.5 W (depending on I/O configuration)
- Signal Levels:
- Logic High (Input): 2.0 V min
- Logic Low (Input): 0.8 V max
- Logic High (Output): 2.4 V min @ 2.6 mA
- Logic Low (Output): 0.4 V max @ 24 mA
- Isolation: None (direct TTL interface; external isolation recommended if required)
- Operating Temperature: 0°C to +50°C
- Storage Temperature: -20°C to +70°C
- Humidity: 5% to 90% RH, non-condensing
- PCB Material: FR-4 industrial-grade fiberglass epoxy laminate
- Mounting Type: Full-length ISA card, standard bracket
4. Functionality
The AX5244H functions as a high-capacity digital I/O expansion card for ISA-based computer systems. It interfaces directly with the system bus, providing 144 programmable digital lines that can be configured as inputs or outputs in groups, consistent with the 8255 Mode 0 operation.
Operation Principle:
- Each group of I/O lines behaves like an 8255 PPI port, allowing software control over data direction and state.
- The card monitors input lines for state changes and can trigger interrupts on designated IRQ lines (IRQ2–IRQ15).
- Output lines can drive TTL-level devices such as LEDs, relays (through driver circuits), or logic modules.
Use Cases and Applications:
- Industrial automation and process control systems
- Data acquisition and monitoring
- Machine control and robotics
- Laboratory instrumentation and test benches
- Legacy system maintenance and expansion
- Digital signal interfacing for embedded control systems
Compatibility:
- Compatible with AT ISA bus architecture (8/16-bit)
- Supported by Windows and Unix operating systems via dedicated drivers
- Software compatibility with 8255-based applications and libraries
5. Components & Accessories
Included Items:
- AX5244H ISA card (fully assembled and tested)
- User manual and installation guide (digital or printed)
- Driver software package (Windows and Unix versions)
- Configuration utility for IRQ and I/O mapping
Optional Accessories:
- 50-pin ribbon cables for external connection
- Terminal boards or breakout modules for field wiring
- Rack-mount or DIN-rail adapter kits (for external I/O termination)
- External isolation modules (for high-voltage or industrial signal interfacing)
Connectors:
- Six 50-pin IDC headers, each providing 24 I/O lines (total 144 lines)
- Pin assignments follow standard 8255 port mapping conventions
- Connectors are keyed for correct cable orientation
6. Installation & Setup
System Requirements:
- IBM PC/AT or compatible system with available ISA slot
- Operating system: Windows (various versions) or Unix/Linux
- Minimum CPU and memory requirements depend on host system and application software
Installation Procedure:
1. Power off the host computer and disconnect it from the power source.
2. Insert the AX5244H card into an available ISA slot, ensuring proper alignment and seating.
3. Secure the card with the mounting screw on the bracket.
4. Connect external devices or terminal boards to the 50-pin headers using appropriate cables.
5. Configure IRQ settings via software or jumper (depending on revision).
6. Install the provided driver package and verify device recognition in the operating system.
7. Use the configuration utility to assign I/O directions and test signal functionality.
Mounting Options:
- Standard internal mounting in desktop or industrial PC chassis
- External I/O termination via ribbon cables to breakout panels
Configuration:
- I/O direction and interrupt settings are software-configurable
- IRQ lines selectable from IRQ2–IRQ15 for flexible system integration
- Emulation mode fixed to 8255 Mode 0 for compatibility
7. Performance & Capabilities
Speed and Throughput:
- Typical I/O access time: <1 µs per operation (ISA bus dependent)
- Supports high-speed digital signal toggling within TTL limits
- Efficient interrupt-driven input monitoring reduces CPU overhead
Capacity:
- 144 digital channels per card
- Multiple cards can be installed in a single system (subject to available ISA slots and address space)
Efficiency:
- Low power consumption due to TTL-level operation
- Software-controlled I/O direction minimizes hardware complexity
Limitations:
- No optical isolation or high-voltage protection on-board (external modules recommended for industrial environments)
- Limited to ISA bus systems (not compatible with PCI or PCIe without adapters)
- Fixed 8255 Mode 0 operation (no Mode 1 or Mode 2 support)
Reliability:
- Proven 8255-compatible architecture ensures stable and predictable operation
- Industrial-grade PCB and components for long service life
8. Standards & Compliance
Electrical and Mechanical Standards:
- Complies with ISA (Industry Standard Architecture) electrical and mechanical specifications
- TTL logic levels conform to standard 74-series logic thresholds
Software and Driver Compliance:
- Windows and Unix driver packages conform to standard OS driver models
- Backward-compatible with legacy 8255-based software interfaces
Regulatory Compliance:
- Designed to meet CE and FCC Class A requirements for electromagnetic compatibility (EMC)
- RoHS-compliant manufacturing (lead-free solder and materials)
Industry Standards:
- 8255 PPI functional emulation standard
- IDC 50-pin connector pinout standard for digital I/O cards
9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 1 year) covering defects in materials and workmanship
- Extended warranty options may be available upon request
Technical Support:
- Comprehensive technical documentation and driver downloads available from Axiom’s support portal
- Email and phone-based technical assistance for installation and configuration issues
- Example code and API references for software integration
Maintenance:
- No routine maintenance required beyond standard system care
- Periodic inspection of connectors and cables recommended for reliable operation
- Firmware updates not applicable (hardware-based emulation)
Software Updates:
- Driver updates periodically released to maintain compatibility with new OS versions
- Configuration utilities updated for enhanced usability and diagnostics
Service and Replacement:
- Field-replaceable card; no user-serviceable internal components
- Replacement units available through authorized Axiom distributors
Documentation:
- User manual includes detailed pin assignments, electrical characteristics, and programming examples
- Application notes available for integration with PLCs, sensors, and actuators
Summary
The Axiom AX5244H 144 DIO AT ISA Card is a robust, high-density digital I/O solution tailored for industrial automation, data acquisition, and control applications requiring extensive parallel digital interfacing. By emulating the Intel 8255 PPI in Mode 0, it ensures seamless compatibility with a wide range of legacy and modern systems. With 144 TTL-level channels, six 50-pin connectors, and support for IRQ2–IRQ15 interrupts, the AX5244H delivers flexible, high-performance digital control within a compact ISA form factor. Supported by both Windows and Unix drivers, it provides a reliable and cost-effective interface for engineers, system integrators, and developers maintaining or expanding ISA-based control systems.
Approximate Length: ~3,050 tokens (~12,200 characters)
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