1-4 Programmer’s Guide
Introduction to GPIB Programming
Bus Structure
Bus Structure
Data Bus
The data bus consists of eight lines that are used to transfer data from
one device to another. Programming commands and data sent on these
lines are typically encoded in the ASCII format, although binary
encoding is often used to speed up the transfer of large arrays. Both
ASCII and binary data formats are available to the analyzer. In addition,
every byte transferred over GPIB undergoes a handshake to ensure
valid data.
Handshake Lines
A three-line handshake scheme coordinates the transfer of data between
talkers and listeners. This technique forces data transfers to occur at the
speed of the slowest device, and ensures data integrity in multiple
listener transfers. With most computing controllers and instruments, the
handshake is performed automatically, which makes it transparent to
the programmer.
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