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S:\agilent\8920\8920b\PRGGUIDE\BOOK\CHAPTERS\advoper.fb
Chapter 5, Advanced Operations
Instrument Initialization
Selected Device Clear (SDC) GPIB Bus Command
The Selected Device Clear (SDC) Reset is accomplished by sending the SDC
message to the Test Set through GPIB. The Test Set responds to the Selected
Device Clear (SDC) and the Device Clear (DCL) bus commands equally. Refer to
the
“Device Clear (DCL) GPIB Bus Command” on page 311 for a description of the
effects of the SDC Reset.
Interface Clear (IFC) GPIB Bus Command
The Interface Clear (IFC) Reset is accomplished by having the Active Controller
send the ABORT message to the GPIB bus (ABORT message = IFC bus control
line TRUE for 100 ms).
The IFC bus command unconditionally terminates all GPIB bus activity and the
Test Set is unaddressed.
The IFC bus command has no effect on the I/O CONFIGURE, CONFIGURE,
PRINT CONFIGURE, or TESTS (Main Menu, Execution Conditions, External
Devices, Printer Setup) screens.
Other operational characteristics are also affected by the IFC bus command as
follows:
• The Power-up self-test diagnostics are not performed.
• The GPIB interface is not reset (any pending Service Request is not cleared).
• The Contents of the SAVE/RECALL registers are not affected.
• Measurement triggering is not affected.
• Calibration data is not affected .
• All Enable registers are unaffected: Service Request, Standard Event, Hardware #1,
Hardware #2, Operation, Calibration,Call Processing and Questionable Data/Signal.
• All Negative Transition Filter registers are unaffected: Hardware #1, Hardware #2, Op-
eration, Calibration,Call Processing and Questionable Data/Signa.l
• All Positive Transition Filter registers are unaffected: Hardware #1, Hardware #2, Op-
eration, Calibration,Call Processing and Questionable Data/Signal.
• The contents of the RAM memory are unaffected.
• The contents of the Error Queue are unaffected.
• The contents of the Output Queue are unaffected.
• The state of the Test Set display screen is not affected