B&K Precision 4079 - Manual - Manual (Page 94)

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The SPE message generates output serial poll status bytes when talk-addressed.
SPD-Serial Poll Disable (25 with ATN)
The SPD message switches back to generating output data from the Output Buffer.
MLA-My Listen Address (GPIB Address + 32)
MTA-My Talk Address (GPIB Address + 64)
The instrument GPIB primary address establishes the listen and talk addresses. To see the current GPIB primary address,
press SPECIAL and then F1:SYS on the front panel. When the waveform generator is talk-addressed or listen-addressed, the
front-panel ADRS indicator lights.
LLO-Local Lockout (17 with ATN)
When the waveform generator is listening addressed, the LLO message changes the waveform generator to the front-panel
lockout state.
REN-Remote Enable (GPIB pin 17)
REN is normally held true by the controller and allows the controller to then put the waveform generator into one of the
remote states. Pulsing REN false or holding it false forces the device into local state (LOCS).
NOTE
If you disconnect and reconnect the GPIB cable when the controller is holding REN true, the REN goes false and the device
got to local state (LOCS).
GTL-Go To Local (1 with ATN)
Listen-addressed instruments respond to GTL by changing to a local state. Remote-to-local transitions caused by GTL do not
affect the execution of the message being processed when GTL was received.
Remote-Local Operation
Most front-panel controls cause a transition from REMS to LOCS by asserting a message called return-to-local (rtl). This
transition can occur during message execution. However, in contrast to TGL and REN transitions, a transition initiated by rtl
affects message execution. In this case, the waveform generator generates an error if there are any unexecuted setting or
operational commands.
Front-panel controls that change only the display, do not affect the remote-local states. Only front-panel controls that change
settings assert rtl. The rtl message remains asserted when you enter multiple keystroke settings from the front panel, and is
unasserted after you execute the settings changes. Since rtl prevents transition to REMS, the waveform generator unasserts rtl
if you do not complete a multiple key sequence in a reasonable length of time (about 5 to 10 seconds).
A record of the front-panel settings is in the Current Settings Buffer; however, new settings entered from the front panel or
the controller update these recorded settings. In addition, the front panel updates to reflect setting changes from controller
commands. Settings are unaffected by transitions among the 4 remote-local states. The REMOTE indicator lights when the
waveform generator is in REMS or RWLS.
Local State (LOCS)
When in a local state (LOCS), you control the settings through the front-panel controls. In addition, only GPIB query