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2 Installing the Instrument
Primary/Secondary Connections - for all models
A primary/secondary configuration can be used when connecting units in parallel. This allows one
designated unit to be the primary controller of all of the units in the paralleled stack. The
primary/secondary communication uses a digital RS485 bus. Connections are made using the
supplied, shielded CAT6A cable as shown in the following figure. For further information about
primary/secondary configurations, refer to
Parallel
Operation.
The figure also shows the termination switch settings for the paralleled units. Only the first and last
units in the stack must have the switch set to the "terminated" position. The switches of the in-
between units must be set to "unterminated". If only two units are connected in a primary/secondary
configuration, both units must have their switches set to "terminated". A current-sharing fault (CSF)
may occur if the switches are set incorrectly.
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Keysight RP7900 Series Operating and Service Guide
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