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.
