Operation and Features 2
Disabling the Output
E364xA User’s and Service Guide 51
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 state is OFF. The TTL
output of pin 1 or pin 9 of the RS- 232 connector is available
only after installing two jumpers (JP1 and JP2)
[1]
inside the
power supply. Refer to “Component Locator Diagram” on
page 225 to locate them.
[1] For serial MY53xx6xxx, the two jumpers are JP752 and JP751.
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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