GW Instek PSU-Series User Manual - Manual (Page 131)

ANALOG CONTROL
131
External control of Shutdown
Background The output of the power supplies can be
configured to shut down via an external switch.
The voltage across pins 7 and 20 are internally
pulled to +5V ±5% @ 500uA with 10kΩ pull-up
resistor. The output is turned off when a low
TTL level signal is applied.
Connection
PSU Switch
Analog
connector
20
7
Output
Terminal
2 core shielded
wire or twisted
pair
 Pin7→ Switch
 Pin20 → Switch
 Wire shield → negative (-) output terminal
Steps 1. Connect the external switches according to the
connection diagrams above.
2. The switch will now shut down the power
supply when shorted.