GW Instek PSU-Series User Manual - Manual (Page 128)

PSU Series User Manual
128
External Control of Output
Background The output can be turned on or off externally
using a switch. The analog control connector
can be set to turn the output on from a high or
low signal. The voltage across pins 19 and 20
are internally pulled up to +5V ±5% @ 500uA
with 10kΩ pull-up resistor. A short (closed
switch) produces a low signal.
When set to High = On, the output is turned on
when the pins 19-20 are open.
When Low = On, the output is turned on when
pins 19-20 are shorted.
Connection
PSU Switch
Analog
connector
20
19
Output
Terminal
2 core shielded
wire or twisted
pair
 Pin19 → Switch
 Pin20 → Switch
 Wire shield → negative (-) output terminal
Steps 1. Connect the external switch according to the
connection diagrams above.