1261B User Manual
iii
Measuring Power Supply Voltages ............................................................................................ 4-3
Measuring Power Supply Currents ............................................................................................ 4-3
Measuring Ambient Temperature .............................................................................................. 4-3
Measuring VXI Slot Temperature .............................................................................................. 4-4
Measuring Fan Speed ............................................................................................................... 4-4
Measuring Elapsed Time........................................................................................................... 4-5
Reading The Present State of VXI Signals................................................................................ 4-5
Monitoring The VXI Subsystem ................................................................................................. 4-6
Programming The Tolerance Limits........................................................................................... 4-6
Programming The Power Supply Voltage Tolerance Limits....................................................... 4-7
Programming The Power Supply Current Tolerance Limits ....................................................... 4-7
Programming The Fan Speed Tolerance Limits ........................................................................ 4-8
Programming The Ambient Temperature Tolerance Limits ....................................................... 4-8
Programming The VXI Slot Temperature Tolerance Limits ....................................................... 4-9
Programming The VXI Bus Error and IACKn Tolerance Limits................................................ 4-11
Reading The VXI Bus Error and IACKn Counters.................................................................... 4-11
Clearing The VXI Bus Error and IACKn Counters.................................................................... 4-12
Generating an Interrupt When an Alarm Condition is Detected ............................................... 4-12
Clearing The Filter Service Alarm............................................................................................ 4-22
Change of Limit for Filter Service Alarm Example ................................................................... 4-23
Interrupt Generation Example ................................................................................................. 4-23
Programming The Trigger Subsystem..................................................................................... 4-25
Connecting The TRIG IN Input To a TTLTRG Line ................................................................. 4-25
Connecting The TRIG OUT Output To a TTLTRG Line........................................................... 4-26
Discrete Fault Indicator............................................................................................................ 4-27
Programming the Discrete Fault Indicator ............................................................................... 4-27
Testing the DFI Operation ....................................................................................................... 4-28
Programming a Trigger Delay Time ........................................................................................ 4-28
Selecting The Trigger Delay Application.................................................................................. 4-29
Programming The Front Panel Display.................................................................................... 4-29
Turning The Display On and Off.............................................................................................. 4-30
Writing a Message To The Display.......................................................................................... 4-30
Clearing The Message From The Display ............................................................................... 4-31
Front Panel Message Semantics............................................................................................. 4-32
Front Panel Status Messages.................................................................................................. 4-32
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