WinSystems PCM-UIO48A-8 Universal 48-Point I/O Module

The WinSystems PCM-UIO48A-8 is a PC/104-compliant universal 48-point digital I/O module engineered for industrial data acquisition, process control, and automation systems requiring flexible real-time event handling. Built on the WinSystems WS16C48 ASIC High Density I/O Chip, it delivers 48 bidirectional digital I/O lines in a compact 3.60″ × 3.80″ form factor. Each line operates in Input, Output, or Output with Readback mode with 12 mA sink current and TTL compatibility.

The module’s defining capability is event-driven interrupt processing. Twenty-four of the 48 lines support digital edge transition detection—both rising and falling edges—with software-programmable polarity and individual interrupt enable. Detected changes are latched and signaled via interrupt, eliminating the need for continuous polling. Interrupt identification registers pinpoint the exact transitioning port and bit, enabling rapid response to time-critical events.

– Technical Specifications

• I/O Configuration: 48 bidirectional lines; 24 lines with edge-transition event sensing
• Edge Detection: Rising and falling transitions; software-programmable polarity per line
• Output Current: 12 mA sink per line; TTL compatible
• Interrupt Routing: Via PC/104 bus jumper (J4); identification registers for precise event location
• I/O Connectors: Two 50-pin IDC connectors (J1, J2) with industry-standard I/O rack mating; +5V supply capability (1 A fused per connector)
• PC/104 Interface: 8-bit or 16-bit operation via J5 connector
• I/O Addressing: 16 consecutive addresses on 16-byte boundary; jumper-selectable base address (J3)
• Power Supply: +5V only; 12 mA typical (excluding rack loads)
• Temperature Range: −40°C to +85°C industrial
• Write Protection: Per-port masking registers

– Key Features

• Event latching for rising/falling edges on 24 dedicated lines
• Software-configurable interrupt enable per event sense line
• Change-of-state detection without host polling overhead
• Port-level write protection via mask registers
• Dual 50-pin IDC connectors support standard industrial I/O racks

– Typical Applications

Sensor monitoring and alarm detection, motion control and positioning systems, discrete process automation, real-time event logging in industrial control.

– Compatibility & Integration

PC/104 standard expansion module with 8-bit or 16-bit interface. Integrates directly with industry-standard 50-pin IDC I/O racks and existing PC/104 embedded systems.