The National Instruments GPIB-232CV-A is an IEEE 488 converter that bridges GPIB (General Purpose Interface Bus) devices and RS-232 serial interfaces. It enables protocol conversion between faster GPIB networks and slower serial devices through an 8-bit microcomputer, integrated DMA controller, and 256 KB RAM buffer. This isolation architecture prevents communication bottlenecks in automated test systems, data acquisition setups, and instrument control applications.
– Technical Specifications
Protocol Conversion: IEEE 488 (GPIB) to RS-232
Microprocessor: 8-bit architecture optimized for protocol conversion
Memory: 256 KB RAM buffer
Data Transfer Rates:
• RS-232: Up to 38.4 kb/s
• GPIB (to buffer): 625 kbytes/s maximum
Interface Compatibility:
• Full RS-232 electrical specification compliance
• IEEE 488.2 GPIB compliance
• Full duplex UART
Connectors:
• IEEE 488 standard 24-pin GPIB
• 9-pin male D-Sub RS-232
Power: 100-120 VAC, 50/60 Hz, 55 mA
Operating Temperature: 10 to 40 °C
Storage Temperature: 0 to 70 °C
Dimensions (AC model): 3.0 × 1.1 × 4.7 inches
Weight: 12 oz
– Key Features
• Switch-selectable configuration for operating mode, GPIB primary address, RS-232 transfer rate, parity, stop bits, word length, and termination mode
• Supports both GPIB Controller and Device modes
• Hardware handshaking and XON/XOFF protocols ensure data integrity
• Six front-panel LED indicators: POWER, READY, TALK, LISTEN, BUSY, and FULL
• Operating system stored in ROM
– Typical Applications
• Legacy instrument integration with RS-232 serial devices
• GPIB bus expansion to serial-only equipment
• Automated test system upgrades requiring protocol bridging
– Compatibility & Integration
Supported on virtually all PC platforms. Compatible with NI-488.2 software for Windows 3.1/DOS and Win32 applications. Optional 9-pin, 2 m RS-232 shielded cable available for IBM PC connections.
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