1257 User Manual
Computer Interfaces 4-10
EADS North America Defense
Test and Services, Inc.
©
2001
then proceed to the section Storing the Menu Preferences to
make the changes permanent. Following this procedure will
put the settings into non-volatile memory and allow them to
be restored during instrument power-up.
Using the IEEE-
488 (GPIB)
Interface
Basic GPIB
Information
The GPIB standard permits up to 15 devices (including the
controller) to interconnect and reside on a single bus. GPIB cables
have identical stackable connectors at each end, allowing several
cables to connect to a single source. System devices and
instruments may be interconnected in almost any desired
configuration. There must be a path from the controller to every
device residing on the bus.
GPIB cables are available from EADS North America Defense Test
and Services in two lengths:
•
GPIB Cable, 1 meter (3.28 ft.)
P/N 500310-001
•
GPIB Cable, 2 meters (6.56 ft.)
P/N 500310-002
To use the IEEE-488 (GPIB) interface with the 1257 Switching
System, you also need a computer equipped with a GPIB
controller.
GPIB Cabling
Guidelines
Adhere to the following guidelines to maximize the data transfer
rate of the GPIB system:
•
Total cable length of no more than 20 meters (65.6 feet).
•
Maximum separation of 4m (13.2 feet) between devices.
Average separation of no more than 2 meters (6.6 feet).
•
Maximum of 15 devices (including controller) connected to the
bus.
Longer cable length and more devices than 15 can be
accommodated with bus extenders available from third-party
sources.
