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Primary/Secondary Connections
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
The figure also shows the termination switch settings for the paralleled stack. The unit designated as
the primary unit must be located at one end of the parallel stack with it's switch set as shown in the
"Primary termination" figure. The other end unit in the stack must have its switch set as shown in the
"End termination" figure. The switches of the in-between units must be set as shown under
"Unterminated". If only two units are connected in a primary/secondary configuration, one unit must
have its switches set as the primary, and the other must have its switched set as the end units. A
current-sharing fault (CSF) may occur if the switches are set incorrectly.
Primary termination
Unterminated
End Termination
Do not install units into aprimary/secondary configuration that are not actively being used as part of
the primary/secondary group.
Series Connections
Series connections are not permitted under any circumstances.
SHOCK HAZARD/LETHAL VOLTAGES Series connections are not permitted for many
reasons. One reason is that exceeding the maximum float voltages ratings given in the
characteristics tables is extremely dangerous and it is impossible to guarantee safe
voltage balance when using bidirectional instruments in series.
Keysight RP7970 & RP7980 Series Operating and Service Guide
Parallel
Operation.
2 Installing the Instrument
77
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