User manual

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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

PSUSwitch

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.