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SECTION4
GPIB Interface
4.2
OVERVIEW
OF MODEL 3930A GPIB
INTERFACE
4.2.1
Introduction
Bus Driver
Table 4-3 gives the bus driver specifications.
Table 4-3.
Bus Driver
Specifications
The Model 3930A GPIB interface has a wide variety of in-
terface functions.
These functions
allow remote the set-
ting of most of the parameters which can be set from the
front panel. The interface can also transfer setting data
and conditions
to an external device, enabling the user to
easily configure a sophisticated
automatic measurement
system.
Setting data and conditions
are sent to the controller
as
character strings in ASCII format.
4.2.2
Specifications
Interface Functions
Table4-2
shows the interface
functions
of the Model
3930A.
DAV
EOI
Three-state
Cd.3
Codes which can be received by the Model 3930A in lis-
tener mode are in 7-bit ASCII format (bit 7 is ignored).
Codes can be sent using either lower-case or upper-case
letters. In either case, codes are interpreted
and executed
identically.
The space (20H), tab (09H), null (OOH), and
semicolon ";" (3BH) characters are ignored.
Talker (inquiry)
mode transmission
codes are also in 7-bit
ASCII format. AU letter characters are sent as upper-case
ktteI3.
GPIB Primary Address
The GPIB address of the Model 3930A is set by the front
panel GPIB key. Set values are stored in battery backed
up memory when the power is turned off. For details on
setting the primary address, see
0.
8
m paragraph 3.2.1.
The factory default value for the primary address is 2.
Table 42.
Interface
Functions
Source Handshake
Explanation
Full source handshake capabilities
Full acceptor handshake capabilities
Basic talker functions, serial poll, unaddressed
by MLA
Basic listener functions, unaddressed by MTA
Full service request capabilities
Full remote/local
capabilities
No parallel poll capabilities
Full device clear capabilities
No device trigger capabilities
No contmller
capabilities
4-6
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