Radisys EXM22

The Radisys EXM22 is a high-performance GPIB interface card for VXI systems, enabling direct connection between a RadiSys Embedded PC and IEEE 488.1/488.2 compliant instrumentation buses. Built around the Texas Instruments 9914 GPIB controller, the EXM22 delivers deterministic data transfer rates suitable for automated test environments. Two configurations address different throughput requirements: the standard EXM22 supports read transfers to 350 KB/second and write transfers to 600 KB/second, while the EXM22+ variant incorporates 1 MB or 4 MB of DRAM buffering to achieve burst rates up to 1 MB/second on both read and write operations.

– Technical Specifications

• Bus Standard: IEEE 488.1 and IEEE 488.2 compliant
• Controller: Texas Instruments 9914 GPIB controller chip
• Host Platform: VXI systems only
• Buffer Memory (EXM22+): 1 MB or 4 MB DRAM
• Maximum Operating Elevation: 10,000 ft
• Temperature Derating: 2°C per 1,000 ft elevation above sea level
• GPIB Connector: Standard female panel-mount

– Key Features

• Standard EXM22 read performance: 350 KB/second; write performance: 600 KB/second
• EXM22+ burst-mode performance: 1 MB/second (read and write)
• Pin-compatible with Hewlett-Packard 82341A GPIB interface (single interrupt line difference)
• Integrated into RadiSys EPConnect software driver package
• ESD-sensitive device; installation requires static-free environment

– Typical Applications

• Automated test systems requiring GPIB instrument control
• Data acquisition from multiple lab instruments
• Industrial test environments with VXI-based measurement architectures

– Compatibility & Integration

The EXM22 integrates exclusively with RadiSys Embedded PC (EPC) hosts within VXI chassis. Software drivers ship with the EPConnect package. Hardware compatibility with HP 82341A cards is supported with documented interrupt-line exceptions. For electrical specifications and detailed operating parameters, reference the EXM-22 Hardware Reference manual.