The RS423 and GPIB Ports. Remote Control 1250 Frequency Response Analyzer
13-8 AMK/1250/4
13.6.1 LOCAL LOCK-OUT
The REMOTE/LOCAL facility described above can also have a LOCAL LOCK-OUT
condition superimposed by a command from the Controller. Once LOCAL LOCK-OUT
is on, transfer of control from one device to another can only be accomplished by the
GPIB Controller. This facility can be used, for example, to prevent unauthorised Front
Panel manipulations affecting the settings of the 1250. Fig. 13.4 shows the relationship
of the LOCAL LOCK-OUT feature to the REMOTE and LOCAL states previously shown
in Fig. 13.3.
Figure 13.4 - REMOTE/LOCAL State Diagram With LOCAL LOCK-OUT
The LOCAL LOCK-OUT state is cancelled when the REMOTE ENABLE signal from the
Controller is false, i.e. the Controller sends REN. As in Fig. 13.3, if the Controller sends
"GO TO LOCAL", the LOCAL state which was previously in force will be resumed.
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