SCPI Status Register 
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customer  through  BIT4  bit.    The  data  bits  in  Status  byte  group  will  not  be 
latched, when the information in event register is changed, the correspo0nding 
bit in status byte register will subsequently be changed. 
One or more bits are set in the questionable 
status   
register (bits must be enabled in the enable 
register). 
Data is available in the power supply output 
buffer. 
One  or  more  bits  are  set  in  the  standard 
event register (bits must be enabled in the 
enable register). 
The  power  supply  is  requesting  service 
(serial poll).