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.
