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© National Instruments Corporation B-1 GPIB-120A User Manual
Appendix B
Specifications
This appendix lists the specifications of the GPIB-120A.
Table B-1. System Configuration
Configuration Specification
Loading per expansion Up to 14 additional devices
GPIB driver output circuit and T1 timing
of source device
No restrictions
Note: T1 is the data settling time (DIO valid to DAV) and varies according to the type
of drivers and the system configuration used.
Table B-2. Performance Characteristics
Characteristic Specification
Data transfer rate degradation 250 ns per byte, typical
Propagation delay
All signals except DAV
DAV (first byte)
DAV (subsequent bytes)
140 ns typical for signal assertion edge
180 ns typical for signal unassertion edge
200 ns maximum
2.5 µs typical for signal assertion edge
180 ns typical for signal unassertion edge
140 ns typical for signal assertion edge
180 ns typical for signal unassertion edge
200 ns maximum
Transfer Rate
Read from isolated GPIB instrument
Write to isolated GPIB instrument
GPIB commands to isolated GPIB instrument
800 kbytes/s maximum
800 kbytes/s maximum
320 kbytes/s maximum