1. Product Overview
Product Name: PC/104+ 48 TTL DIO Module
Model: PCM-7248+
Series: PCM Series – PC/104+ Industrial I/O Modules
Article Number: PCM-7248+
Manufacturer: ADLINK Technology Inc.

The ADLINK PCM-7248+ is a high-performance PC/104+ digital input/output (DIO) module designed for embedded and industrial control applications requiring reliable, high-density TTL-level digital I/O. As part of ADLINK’s PCM series, the PCM-7248+ provides 48 channels of TTL-compatible digital I/O in a compact, rugged PC/104+ form factor. It integrates an Intel 8254 programmable timer/counter and a 32-bit watchdog timer, offering precise timing, counting, and system monitoring capabilities. The module is Opto 22-compatible, ensuring seamless integration with a wide range of industrial I/O racks and signal conditioning modules.

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2. Key Features
- 48 TTL Digital I/O Lines: Provides 48 channels of TTL-level digital input/output, configurable in groups for flexible control and monitoring.
- PC/104+ Interface: Fully compliant with the PC/104+ (PCI-based) embedded computing standard, ensuring stackable, modular integration with other PC/104+ boards.
- Opto 22 Compatibility: Pinout and signal configuration compatible with Opto 22 digital I/O racks and modules, simplifying system expansion and integration.
- Onboard Intel 8254 Timer/Counter: Three 16-bit programmable counters for event counting, frequency generation, or timing control.
- 32-bit Watchdog Timer: Provides system reliability by monitoring system operation and triggering a reset or interrupt in case of software or hardware failure.
- Compact Form Factor: Measures 96 mm x 90 mm, conforming to the PC/104+ mechanical standard for embedded systems.
- High-Speed Digital I/O: Supports fast TTL-level signal switching suitable for real-time control and data acquisition.
- Industrial-Grade Design: Engineered for embedded and industrial environments with robust electrical characteristics and long-term reliability.
- Software Support: Compatible with major operating systems and development environments; driver and library support available from ADLINK.
- Flexible Configuration: Programmable direction control for each I/O port, allowing dynamic switching between input and output modes.

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3. Technical Specifications
- Form Factor: PC/104+ (PCI-based stackable module)
- Dimensions: 96 mm (L) × 90 mm (W)
- Digital I/O Channels: 48 TTL-compatible lines
- I/O Configuration: Programmable in groups (typically 8-bit ports) for input or output operation
- Logic Levels:
- Input high voltage (VIH): 2.0 V min
- Input low voltage (VIL): 0.8 V max
- Output high voltage (VOH): 2.4 V min
- Output low voltage (VOL): 0.4 V max
- Output Drive Capability: Typically ±2.5 mA per channel
- Timer/Counter: Intel 8254, 3 × 16-bit programmable counters
- Watchdog Timer: 32-bit programmable timer with system reset or interrupt output
- Bus Interface: PC/104+ (PCI bus, 32-bit, 33 MHz)
- Connector Type: 50-pin Opto 22-compatible headers
- Power Requirements: +5 VDC (typical consumption < 500 mA)
- Operating Temperature: 0°C to +60°C (standard); extended temperature versions available upon request
- Storage Temperature: -20°C to +85°C
- Relative Humidity: 5% to 95%, non-condensing
- Weight: Approximately 100 g (typical)
- Material: Multi-layer PCB with industrial-grade components and gold-plated connectors

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4. Functionality
The PCM-7248+ functions as a high-density digital I/O interface for embedded control systems. It connects directly to the PC/104+ bus, allowing the host CPU to read or write digital signals through memory-mapped or I/O-mapped registers. Each of the 48 TTL lines can be configured as input or output, enabling flexible control of sensors, actuators, relays, and other digital devices.

The Intel 8254 timer/counter provides three independent 16-bit counters that can be programmed for event counting, frequency generation, pulse-width modulation, or time delay generation. The 32-bit watchdog timer enhances system reliability by monitoring software execution; if the system fails to reset the watchdog within a specified interval, it triggers a system reset or interrupt to recover from faults.

Use Cases and Applications:
- Industrial automation and process control
- Machine monitoring and equipment interfacing
- Data acquisition and signal monitoring
- Laboratory instrumentation and test systems
- Embedded control in transportation, robotics, and energy systems
- OEM and system integrator applications requiring compact, stackable I/O expansion

Compatibility:
- Compatible with PC/104+ CPU modules and peripheral boards
- Opto 22-compatible pinout for direct connection to digital I/O racks
- Supported by ADLINK’s driver libraries for Windows, Linux, and real-time operating systems

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5. Components & Accessories
Included Items:
- PCM-7248+ PC/104+ 48 TTL DIO module
- User manual and documentation (digital or printed)
- Driver and software utility package (downloadable from ADLINK support site)

Optional Accessories:
- Opto 22-compatible 50-pin ribbon cables
- Terminal boards for easy field wiring (e.g., DIN-rail mountable breakout boards)
- PC/104+ stack-through connectors and spacers
- Cable assemblies for external signal interfacing
- Mounting hardware for embedded chassis integration

Connectors:
- Two 50-pin Opto 22-compatible headers for digital I/O
- PC/104+ stack-through connectors for PCI bus interface

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6. Installation & Setup
Requirements:
- Host system with available PC/104+ (PCI) stack connector
- +5 VDC power supply from the PC/104+ bus
- Compatible operating system with ADLINK driver support

Mounting Options:
- Stackable installation on PC/104+ CPU or peripheral modules using standard PC/104+ connectors and spacers
- Can be mounted in embedded enclosures or industrial chassis supporting PC/104+ form factor

Configuration:
- I/O direction and function configured via software registers
- Timer/counter and watchdog parameters programmable through driver API or direct register access
- Software utilities provided for configuration, testing, and diagnostics
- Plug-and-play PCI resource allocation (IRQ, I/O base address) handled automatically by the system BIOS or operating system

Setup Procedure:
1. Power off the host system and install the PCM-7248+ onto the PC/104+ stack.
2. Secure the module using standoffs and screws to ensure mechanical stability.
3. Connect external digital signals to the Opto 22-compatible headers using appropriate cables or terminal boards.
4. Power on the system and verify device recognition through the operating system or ADLINK configuration utility.
5. Install the ADLINK driver package and test I/O functionality using provided sample programs.

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7. Performance & Capabilities
- Digital I/O Throughput: High-speed TTL-level switching suitable for real-time control applications.
- Timer/Counter Performance: 8254 counters support input frequencies up to several MHz, depending on system configuration.
- Watchdog Timer Range: Programmable from milliseconds to several minutes, providing flexible system monitoring intervals.
- Response Time: Determined by host CPU and bus latency; optimized for deterministic embedded control.
- Capacity: 48 independent digital channels, expandable via additional PC/104+ modules.
- Efficiency: Low power consumption and compact design minimize system footprint and thermal load.
- Limitations: TTL-level I/O only (no isolation); for high-voltage or industrial signal interfacing, external isolation modules or Opto 22 racks are recommended.

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8. Standards & Compliance
- PC/104+ Specification Compliance: Fully compliant with PC/104+ (PCI-based) mechanical and electrical standards.
- Opto 22 Compatibility: Electrical and pinout compatibility with Opto 22 digital I/O racks and modules.
- RoHS Compliance: Manufactured in accordance with Restriction of Hazardous Substances (RoHS) directives.
- CE Marking: Meets European EMC and safety requirements for industrial electronic equipment.
- EMC Compliance: Designed to meet EN 55022/55024 standards for electromagnetic compatibility.
- Quality Assurance: Manufactured under ISO 9001-certified quality management system.

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9. Additional Information
Warranty:
- Standard 2-year limited warranty covering defects in materials and workmanship.
- Extended warranty options available through ADLINK service programs.

Support:
- Comprehensive technical support via ADLINK’s global support network.
- Online resources including datasheets, manuals, driver downloads, and FAQs.
- Engineering assistance for integration, customization, and troubleshooting.

Maintenance:
- No routine maintenance required; periodic inspection of connectors and cabling recommended.
- Firmware and driver updates available from ADLINK’s website to ensure compatibility and performance optimization.

Updates & Lifecycle:
- Long product lifecycle support typical of ADLINK’s industrial product lines.
- Backward compatibility with previous PCM-7248 versions ensures smooth migration in existing systems.
- Regular firmware and driver updates maintain compatibility with evolving operating systems and hardware platforms.

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Summary
The ADLINK PCM-7248+ PC/104+ 48 TTL DIO module is a robust, high-density digital I/O solution tailored for embedded and industrial control applications. With 48 TTL-level I/O channels, an onboard 8254 timer/counter, and a 32-bit watchdog timer, it delivers precise timing, reliable system monitoring, and flexible digital interfacing in a compact 96 × 90 mm PC/104+ form factor. Its Opto 22 compatibility ensures seamless integration with standard industrial I/O racks, while its PC/104+ stackable design supports modular system expansion.

Engineered for reliability, configurability, and long-term availability, the PCM-7248+ is ideal for OEMs, system integrators, and developers seeking a proven digital I/O platform for automation, data acquisition, and embedded control systems.