Radisys EXM-2

The Radisys EXM-2 is a C Size VXI controller module that functions as an embedded PC within VXI (VME eXtensions for Instrumentation) systems. Built around a 16 MHz Intel 386 processor, it enables instrumentation platforms to execute standard PC software while maintaining independence from the industrial bus. The module supports MS-DOS 5.0 and Windows 3.1 operating systems, bridging embedded control with modular expansion capabilities.

– Technical Specifications

• Processor: 16 MHz Intel 386
• Operating System Support: MS-DOS 5.0, Windows 3.1
• Form Factor: C Size VXI Controller
• Oscillator Signal: 14.31818 MHz, 70 ns period, 50% duty cycle (not synchronous with system clock)
• Expansion Modules: Up to 8 EXM modules per embedded PC
• Signal Characteristics: Inverted RESET for noise immunity; 15 GND lines (versus 4 on PC/AT bus); EXMID for software configuration; TC signal pulse on terminal count
• Reserved Pins: DMA channel 7, IRQ10, SA17–SA19 not available
• Driver Capability: Collector or tri-state drivers capable of sinking 20 mA
• Signal Logic: Active high and active low configurations; active during DMA cycles

– Key Features

• EXM Expansion Interface—electrically similar to PC ISA bus, 16-bit configuration
• Local bus expandability operating parallel to industrial bus without performance degradation
• Enhanced noise immunity through increased ground lines and inverted RESET architecture
• Software-configurable expansion modules via EXMID signal at power-up
• Direct compatibility with standard PC software and peripherals

– Typical Applications

VXI instrumentation systems requiring embedded PC control with modular local I/O expansion; automated test platforms; industrial measurement systems.

– Compatibility & Integration

Designed for integration into VXI chassis as the primary controller. EXM Expansion Interface accommodates standard PC ISA-compatible modules. Terminal Count signal and DMA cycle control enable coordination with VXI instrument modules.