Series 2280 Precision DC Power Supply Reference Manual  Section 2: General operation 
077085503 / March 2019  2-7 
 
 
If a service request has been generated, SRQ is displayed to the right of the up and down arrows. You 
can configure the instrument to generate a service request (SRQ) when one or more errors or 
conditions occur. This indicator stays on until the serial poll byte is read or all the conditions that 
caused SRQ are cleared. 
 
Level trigger enabled indicator 
When a voltage level trigger or current level trigger is enabled, a solid white square indicator is visible 
to the left of the Buffer indicator.   
Figure 6: Level trigger enabled indicator 
 
When a level trigger is enabled, data is logged to the buffer when the triggering condition is met. 
 
Buffer indicator 
The bar next to Buffer indicates how full the buffer is. 
Less than one-quarter full 
Less than half full, more than one-quarter full 
Less than three-quarter full, more than half full 
More than three-quarter full