47
Chapter 1, Using HP-IB
Remote/Local Modes
Local Lockout
The Local Lockout mode disables the front-panel LOCAL key and allows return
to Local mode only by commands from the System Controller (Clear Lockout/Set
Local message).
When a data transmission to the Test Set is interrupted, which can happen if the
LOCAL key is pressed, the data being transmitted may be lost. This can leave the
Test Set in an unknown state. The Local Lockout mode prevents loss of data or
system control due to someone unintentionally pressing front-panel keys.
NOTE:
Return to Local mode can also be accomplished by setting the POWER switch to OFF and
back to ON. However, returning to Local mode in this way has the following disadvantages:
1. It defeats the purpose of the Local Lockout mode in that the Active Controller will lose
control of the test set.
2. Instrument configuration is reset to the power up condition thereby losing the
instrument configuration set by the Active Controller.
Clear Lockout/Set Local
The Test Set returns to Local mode when it receives the Clear Lockout/Set Local
message. No instrument settings are changed by the transition from Remote mode
with Local Lockout to Local mode but triggering is reset to FULL SETTling and
REPetitive RETRiggering.
Summary of Contents for 8920B
Page 10: ...10 ...
Page 16: ...Contents 16 9 Error Messages Index 673 ...
Page 17: ...17 1 Using HP IB ...
Page 48: ...48 Chapter 1 Using HP IB Remote Local Modes ...
Page 49: ...49 2 Methods For Reading Measurement Results ...
Page 61: ...61 3 HP IB Command Guidelines ...
Page 84: ...84 Chapter 3 HP IB Command Guidelines Guidelines for Operation ...
Page 85: ...85 4 HP IB Commands ...
Page 90: ...90 Adjacent Channel Power ACP ...
Page 116: ...116 Configure I O Configure ...
Page 156: ...156 Call Processing ...
Page 185: ...185 System System SYSTem ERRor Returns integer value quoted string ...
Page 242: ...242 Common Command Descriptions ...
Page 251: ...251 5 Advanced Operations ...
Page 377: ...377 7 IBASIC Controller ...
Page 458: ...458 Chapter 7 IBASIC Controller The TESTS Subsystem ...
Page 640: ...640 Chapter 8 Programming The Call Processing Subsystem Example Programs 11280 SUBEND 11290 ...
Page 643: ...643 9 Error Messages ...
Page 672: ...672 ...
Page 682: ...Index 682 ...