Astronics / EADS / Racal 1260-114OC Open Collector Digital I/O Plug-In Module

The Astronics / EADS / Racal 1260-114OC is an open-collector digital I/O plug-in module delivering 96 independently configurable channels for TTL, CMOS, or standard open-collector signal switching. Engineered for the Racal Instruments 1260-100 Adapt-a-Switch VXIbus carrier, this module excels in industrial control, relay switching, and external device interfacing applications requiring voltage-independent output stages.

## Technical Specifications

**Channel Configuration**
• 96 channels: TTL, CMOS, or open-collector modes
• 48-channel high-voltage/current open-collector (HVOC) variant available
• Independent input/output configuration per channel
• Tri-state/high-impedance capability on TTL/CMOS channels

**Electrical Performance**
• Data rate: up to 200 kHz
• Output voltage drive: up to 50 V
• Sink current: up to 1.5 A per channel
• External pull-up supply (OC version): up to 32 VDC per independent group
• External pull-up supply (HVOC version): up to 50 VDC per independent group

**Control Architecture**
• 2-wire programmable handshaking (active high/low selectable)
• Synchronous, asynchronous, and mixed operating modes
• Data representation in hex, decimal, or binary formats

**Physical & Integration**
• Single-slot, C-size VXIbus form factor
• Front-panel installation into 1260-100 Adapt-a-Switch carrier
• VXIplug&play framework support (Win32-based)
• Driver support: LabWindows/CVI and LabVIEW when used with appropriate controller

## Key Features

• Channel-by-channel configuration flexibility enables mixed TTL/CMOS/OC operation within a single module
• Programmable handshaking eliminates external logic for flow control
• High current sinking capability (1.5 A per channel) handles relay coils and solenoid switching directly
• Voltage-independent open-collector outputs decouple digital logic from external supply domains

## Typical Applications

• Industrial relay and solenoid switching matrices
• Multi-voltage external device control
• Test automation requiring mixed signal-level interfacing
• VXI-based test and measurement systems

## Compatibility & Integration

The module requires the Racal Instruments 1260-100 Adapt-a-Switch carrier and typically an Option-01T Smart Control Module for buffered I/O operations. VXIplug&play software frameworks provide standardized instrument control across Win32 platforms.