NI SCXI-1163 32-Channel Optically Isolated TTL/CMOS Digital Input

The NI SCXI-1163 is a 32-channel optically isolated digital input module for SCXI chassis-based data acquisition systems. It provides 250 Vrms common-mode isolation between eight independent banks and earth ground, protecting measurement systems from voltage transients and ground loops. The module accepts TTL and CMOS logic levels and operates via serial SCXIbus programming for direct integration into existing SCXI architectures. Parallel mode operation is available when directly cabled to a plug-in DIO device.

– Technical Specifications

Digital Input Characteristics
• 32 channels organized into eight isolated banks of four lines each
• TTL and CMOS logic level compatibility
• Open-collector output configuration with 4.7 kΩ pull-up resistors per bank
• 250 Vrms isolation between banks and between banks and earth ground

Performance
• Multiplexed mode update rate: Up to 600 updates per second across all 32 lines
• Parallel mode update rate: Limited by module propagation delay and controlling DIO instrument maximum rate

Power Requirements
• Supply voltage: +5 V ±0.5 V (user-provided)
• Power consumption: 60 mA/bank typical; 80 mA/bank maximum

Physical & Interface
• Dimensions: 1.2 × 6.8 × 8.0 inches (3.0 cm × 17.3 cm × 20.6 cm)
• Rear connector: 50-pin male ribbon cable
• Front connector: 48-pin DIN C male

– Key Features

• Eight optically isolated banks eliminate ground loop interference
• Shared +5 VDC supply per bank with integrated pull-up resistors
• Serial SCXIbus programming eliminates need for external DAQ instruments
• Parallel mode option for applications requiring higher bandwidth

– Typical Applications

• Industrial process monitoring and control systems
• Laboratory data acquisition with high noise environments
• Ground isolation in multi-instrument measurement systems
• TTL/CMOS signal conditioning for SCXI-based test benches

– Compatibility & Integration

The SCXI-1163 integrates directly into NI SCXI chassis without additional cabling. Serial programming via SCXIbus enables transparent operation within existing data acquisition frameworks. Parallel mode connectivity to plug-in DIO devices provides flexibility for bandwidth-critical applications.