© National Instruments Corp.
4-1
GPIB-140 User Manual
Chapter 4
Theory of Operation
This chapter describes how the GPIB extender circuitry operates.
The information in this chapter assumes that you have a basic knowledge of the GPIB. If
you are a first-time user or you would like to review the ba sics, refer to Appendix A,
Operation of the GPIB.
Figure 4-1 shows a model of a GPIB extender. The extender is made up of five layers.
Each layer can be connected to the corresponding layer of another extender at the remote
side to form a complete link.