GPT-9000/9000A Series User Manual 
110 
Using the SIGNAL I/O to Start/Stop Tests 
 
To use the SIGNAL I/O port the Start Ctrl 
settings have to be set to SIGNAL I/O in the 
Common Utility menu.  
1.  Set the Start Ctrl option to SIGNAL 
I/O. 
2.  Connect the Input/Output signals 
to the SIGNAL I/O port. 
3.  To start the testing, short the 
INPUT_STOP and INPUT_COM 
line for a minimum of 1ms to put 
the tester into READY status. 
4.  To start the testing, short the 
INPUT_START and INPUT_COM 
lines for a minimum of 1ms. 
5.  To stop the testing, temporarily 
short the INPUT_STOP and 
INPUT_COM line again. 
Even if the GPT-9000/9000A is configured to use 
the SIGNAL I/O interface, the STOP button on the 
front panel can still be used to stop a test.   
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