Keysight Technologies RP7900 Series, Operating And Service Manual

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Parallel connection example - RP795xA, RP796xA
SHOCK HAZARD, LETHAL VOLTAGES Many models generate voltages greater than 60
VDC, with some models rated at 950 VDC! Ensure that all instrument connections,
load wiring, and load connections are either insulated or covered using the safety
covers provided, so that no accidental contact with lethal voltages can occur.
Master/Slave Connections - for all models
A master/slave configuration can be used when connecting units in parallel as shown in the following
figure. This allows one designated unit to be the master controller of all of the units in the paralleled
stack. Master/slave connections use a digital RS485 bus. Connections are made using standard CAT5
or better cables as shown in the figure to the left. Any unit may be designated as the "master" unit. For
further information about master/slave 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 master/slave
configuration, both units must have their switches set to "terminated". A current-sharing fault (CSF)
may occur if the switches are not set incorrectly.
2 Installing the Instrument
80 Keysight RP7900 Series Operating and Service Guide