User Manual

14-4 Remote Operations 2400 Series SourceMeter
®
User’s Manual
GPIB operation
This section contains information about GPIB standards, bus connections, and
primary address selection.
GPIB standards
The GPIB is the IEEE-488 instrumentation data bus with hardware and program-
ming standards originally adopted by the IEEE (Institute of Electrical and Elec-
tronic Engineers) in 1975. The SourceMeter conforms to these standards:
• IEEE-488.1-1987
• IEEE-488.2-1992
The above standards define a syntax for sending data to and from instruments,
how an instrument interprets this data, what registers should exist to record the
state of the instrument, and a group of common commands. The SourceMeter
also conforms to this standard:
• SCPI 1996.0 (Standard Commands for Programmable Instruments)
This standard defines a command language protocol. It goes one step farther than
IEEE-488.2-1992 and defines a standard set of commands to control every pro-
grammable aspect of an instrument.
GPIB connections
To connect the SourceMeter to the GPIB bus, use a cable equipped with standard
IEEE-488 connectors.
To allow many parallel connections to one instrument, stack the connectors. Two
screws are located on each connector to ensure that connections remain secure.
To avoid possible mechanical damage, stack no more than three connectors on any
one unit.
NOTE To minimize interference caused by electromagnetic radiation, use only
shielded IEEE-488 cables. Available shielded cables from Keithley are
Models 7007-1 and 7007-2.
Primary address
The SourceMeter ships from the factory with a GPIB primary address of 24. When
the unit powers up, it momentarily displays the primary address. You can set the
address to a value from 0 to 30, but do not assign the same address to another
device or to a controller that is on the same GPIB bus (controller addresses are
usually 0 or 21).