The Tektronix VX4802 is a programmable digital I/O module for VXIbus systems that delivers 80 bidirectional digital I/O lines organized into ten independent 8-bit bytes. Each byte configures individually as input or output under program control, supporting both TTL and CMOS logic levels. The module communicates via ASCII hex notation commands and responses, enabling straightforward integration with standard GPIB controllers and NI-488.2M software.
Technical Specifications
• I/O Lines: 80 programmable lines
• Organization: Ten 8-bit bytes, individually configurable
• Logic Levels: TTL or CMOS compatible
• Output Drive (damping resistors removed): High > 2 V @ -15 mA; Low 2.0 V; Low < 0.8 V
• Input Current: < 70 µA @ 2.7 V; < 1 mA @ 5.0 V; < -1 mA @ 0.5 V
• Command Interface: ASCII hex notation
– Key Features
• Independent byte-level input/output configuration via program control
• Programmable input and output data masks
• Command-based or external handshake control modes
• Configurable logic sense for input, output, and handshake lines
• Full parameter reporting capability
• Onboard built-in test equipment (BITE) for self-diagnostics
• Diagnostic LEDs for status and error indication
• Handshake and mask functions for advanced synchronization
– Typical Applications
Automated test and measurement systems requiring flexible digital interfacing, multi-byte parallel control, and independent channel configuration within VXIbus instrument frameworks.
– Compatibility & Integration
VXI format modular systems. Compatible with GPIB controllers and NI-488.2M software. Available with Option 01 (64 mA TTL outputs) or Option 02 (open collector outputs).
