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L-Com IEEE-384 GPIB Tips

IEEE-488 GPIB Tips Answers, Videos, PDFs
Find the right IEEE-488 connector orientation
L-com reverse entry adapters solve cable extension problems in the field
Connector stacking vs. using a bus strip
What does GPIB stand for? General Purpose Interface Bus
What is IEEE-488? IEEE-488 is a standard established in 1978 by IEEE/ANSI. It is a digital interface for programmable instrumentation.
Why is GPIB so popular in instrumentation and data applications? GPIB is a parallel bus that permits multiple devices to be interconnected. The connector system makes bus configuration very flexible. A bus can be configured as a physical star, tree, in-line or a combination of the above.
What types of functions can GPIB devices perform? A device can be a controller, listener, talker or a combination on a bus.
What are the critical cable properties required for IEEE-488? The cable must have 24 conductors with twisted pairs. Conductor to conductor and to ground capacitance can not exceed 150 Pf per meter. An outer braided shield with a minimum of 85% coverage.
What connector type is used for IEEE-488? A 24 contact 2.16mm pitch ribbon type connector.
What kind of hardware do IEEE-488 connectors use? The hardware is Metric, M 3.5x0.6.
What is the maximum number of connectors recommended for stacking? The maximum is 3. Exceeding this can cause damage to the attached device.
What is the maximum of devices allowed on a GPIB bus? The total amount of devices is 15.
What is the maximum data rate on a GPIB bus? The maximum data rate is 1Mbps.
What is the maximum length allowed for a GPIB bus? 20 Meters.
What do the abbreviations IEEE and GPIB stand for? IEEE stands for Institute of Electrical and Electronics Engineers. GPIB stands for General Purpose Interface Bus.
How are the IEEE-488 GPIB cable assembly connectors terminated? These connectors are terminated using the IDC (Insulation Displacement Connection) method. The cable conductors are pressed into a terminal slot smaller than the conductor diameter, displacing the insulation, and forming an electrical contact between the terminal and the conductor.
When would I use an in line GPIB cable assembly? In line GPIB cable assemblies are used in the following situations: 1) When it is convenient to mate a cable at a 90 degree angle. Typically, when mating to a PC or other type of device. 2) When one of the connector halves is not used in an application. This provides a cost savings and prevents the need to cover the unused connector.
I’ve used the reverse entry cable assembly offered in the molded product line but now I need the extra shielding offered in the premium and deluxe product lines. Does L-com offer the reverse entry cable assembly for either of these lines? No, but L-com offers many reverse entry adapters to accomplish this need.
What function does a reverse entry adapter perform? A reverse entry adapter allows two mated GPIB cables to extend in a daisy chain manner. Without these adapters, the cables will exit in the same direction.
What function does an extender perform? An extender allows extra clearance when mating cables to a port with a narrow opening or when clearing neighboring equipment in a tight space.