| Find the right IEEE-488 connector orientation |
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| L-com reverse entry adapters solve cable extension problems in the field |
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| Connector stacking vs. using a bus strip |
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| 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. |
