User`s manual

50
Digital I/O
Using the External Switch Input
The 1100R+ has the ability to start a test based on input from an external switch, such as a
foot pedal or a sensor in automated test equipment. To use the External Switch input you
must first set the users preference External Switch to YES. For more information see
Changing User Preferences on page 27 and External Switch on page 28.
The External Switch input is on pin 1 of the IO connector. When a DC +5 volt (logic high) is
applied to pin 1, the tester behaves as if START TEST were pressed. You can use the DC +5
volts power source on the IO connector to supply the DC +5 voltage through the switch circuit
as shown below. Do not apply a DC voltage over 6 volts or an AC voltage to the input.
Pin 9
DC +5 Volts
Pin 1
External Switch Input