2Operation and Features
76 E364xA User’s and Service Guide
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 (JP1 and JP2)
[1]
inside the power supply. Refer to
“Component Locator Diagram” on page 243 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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