Operation and Features 2
Keysight E364xA User’s and Service Guide 73
Disconnecting the output using an external relay
To disconnect the output, an external relay must be connected between the
output and the load. A TTL signal of either low true or high true is provided to
control an external relay. This signal can only be controlled with the remote
command OUTPut:RELay {OFF|ON}. The TTL output is available on the RS-232
connection pin 1 and pin 9.
When the OUTPut:RELay state is ON, the TTL output of pin 1 is high (4.5 V) and
pin 9 is low (0.5 V). The levels are reversed when the OUTPut:RELay
s
tate is OFF.
The TTL output of pin 1 or pin 9 of the RS-232 connector is available only after
installing two jumpers (JP102 and JP103)
[1]
inside the power supply. Refer to
“Component Locator Diagram” on page 233 to locate them.
[1] For serial MY53xx6xxx, the two jumpers are JP751 and JP752.
Do not use the RS-232 interface if you have configured the power supply to
output relay control signals. Internal components on the RS-232 circuitry may
be damaged.
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