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November 1985
The standard connector is the Amphenol or Cinch Series 57
MICRORIBBON or AMP CHAMP type. An adapter cable using
non-standard cable and/or connector is used for special interconnect
applications.
The
uses negative logic with standard TTL logic levels. When
DAV is true, for example, it is a 'ITL low level ( <= O.SV), and
when DAV is false, it is a TTL high level ( >= 2.OV).
Configuration Restrictions
To achieve the high data transfer rate that the GPIB is designed for,
the physical distance between devices and the number of devices on
the bus is limited.
The following restrictions are typical:
*
A maximum separation of four meters between any two
devices and an average separation of two meters over the
entire bus.
* A maximum total cable length of 20 meters.
* No more than 15 devices connected to each bus, with at least
two-thirds powered on.
Bus extenders are available from National Instruments and other
manufacturers for use when these limits must be exceeded
114
APPENDIX D - OPERATION OF THE GPIB
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