Description

The DRL-DPM-BKF PC104-DPIO is a high-reliability digital parallel I/O expansion module designed for the PC/104 embedded computing standard—a compact, stackable form factor widely used in industrial automation, defense, transportation, and scientific instrumentation. Manufactured by Diamond Systems Corporation (a leading provider of rugged embedded I/O solutions), this module provides 32 bits of programmable digital I/O (typically configured as 16 inputs + 16 outputs) with opto-isolation on all channels to protect the host CPU from electrical transients, ground loops, and noise in harsh environments.

Based on the industry-standard Intel 8255 PPI (Programmable Peripheral Interface) architecture, the PC104-DPIO is software-compatible with legacy DOS, Windows Embedded, Linux, and real-time operating systems (e.g., VxWorks, QNX) without requiring custom drivers. Each I/O line operates at 5V TTL/CMOS levels, and the module supports both polling and interrupt-driven operation (via IRQ3–7 configurable), enabling responsive control in time-critical applications.

The “DRL-DPM-BKF” part number reflects Diamond’s internal naming convention:

• DRL: Digital I/O product line

• DPM: Digital Parallel Module

• BKF: Specific hardware revision or feature set (e.g., isolation type, connector style)

Housed in a low-profile, conduction-cooled PC/104 module (90 × 96 mm), it stacks directly onto a CPU board using self-stacking bus connectors, eliminating cables and saving space. With no moving parts and wide operating temperature support (-40°C to +85°C), it is ideal for embedded systems in oil fields, rail signaling cabinets, UAVs, and test equipment.

⚙️ Technical Specifications

✅ Main Features and Advantages

True 8255 Compatibility:
Enables seamless migration of legacy industrial code without re-engineering—critical for maintaining decades-old control systems in power plants or manufacturing lines.

Robust Electrical Isolation:
Optocouplers on every line prevent field-side faults (e.g., short circuits, surges) from damaging the sensitive CPU board—enhancing system uptime and safety.

Stackable, Cable-Free Design:
Eliminates ribbon cables that can loosen due to vibration; ideal for mobile or airborne platforms where reliability is paramount.

Wide Temperature & Low Power:
Operates reliably in extreme cold (arctic sensors) or heat (engine compartments) with minimal thermal load—no fan required.

Flexible I/O Configuration:
Each 8-bit port (A, B, C) can be independently programmed as input or output via control register, supporting custom bit-banging protocols (e.g., SPI emulation, stepper motor control).

? Application Field

• Industrial Machine Control: PLC replacement, conveyor sequencing, safety interlocks

• Railway Signaling: Track circuit monitoring, switch position feedback

• Defense & Aerospace: UAV payload control, ground test equipment

• Energy & Utilities: Substation RTU digital status collection

• Laboratory Automation: Custom test jigs, sensor triggering

• Legacy System Modernization: Upgrading ISA-based systems to PC/104 without rewriting I/O logic

? Related Products

• Diamond MM-32-ISO: Higher-density 32-channel isolated digital I/O (PCI/PCIe)

• PC104-QUAD04: Quadrature encoder counter module (companion for motion)

• PC104-AIO16: 16-bit analog I/O module

• ConnectTech SP104: PC/104 carrier boards with additional I/O

• WinSystems PCM-3640: Alternative PC/104 digital I/O modules