Astronics / EADS / Racal 1255A Enhanced Automatic Switch System

The Astronics / EADS / Racal 1255A is a modular VXIbus switching controller designed to reduce ATE cost and complexity by consolidating switch management into a single chassis. It accommodates up to four C-sized 1260 Series switch modules and eliminates the need for separate VXIbus mainframes and controllers. The system integrates IEEE-488 (GPIB) and RS-232 interfaces with internal VXI local bus control, enabling direct integration into existing test environments. Non-volatile memory stores relay configurations, while relay monitoring provides confidence verification. Scan mode enables synchronous testing across multiple points. VXIplug&play compliant drivers simplify system development and deployment. ## Technical Specifications Module Capacity: • Supports four C-sized VXIbus 1260 Series switch modules Interfaces: • IEEE-STD-488 (GPIB) interface • RS-232 serial interface • VXI local bus for switch card control Power: • Input voltage: 100, 120, 220, or 240 VAC ±10% • Frequency: 47 to 66 Hz • Maximum consumption: 150 VA Environment: • Operating temperature: 0°C to 50°C • Operating humidity: 95% non-condensing Standards: • MIL-T-28800 Type III, Class 5 compliance • EMC: Council Directive 89/336/EEC • Safety: Low Voltage Directive 73/23/EEC ## Key Features • Message-based control of 1260 Series switch cards • Non-volatile memory for relay configuration storage • Relay monitoring with confidence checking • Synchronous scan mode for multi-point testing • VXIplug&play compliant drivers included • Optional rack mount kit available ## Compatibility & Integration The 1255A integrates directly with Racal Instruments' 1260 Series switch modules and operates within the broader VXIbus switching systems family. IEEE-488 and RS-232 connectivity allows straightforward integration into legacy and modern ATE architectures. Optional accessories include 50 Hz operation, 220/240 VAC input fuse, and standard interface cables.