User`s guide

Remarks
Commas, periods, and semicolons share a display space with the preceding
character (unless it is also a comma, period, or semicolon), and are not
considered individual characters.
While a message is displayed, readings are suppressed on the front-panel
display line in which the message is displayed (DISPlay:WINDow1:TEXT
suppresses readings in the top line, while DISPlay:WINDow2:TEXT
suppresses readings in the bottom line).
DISPlay:WINDow2:TEXT[:DATA] overrides any <feed> set with the
DISPlay:WINDow2:TEXT:FEED command. That is, the text string is
displayed, overriding the measurement or math function in the second
display. The DISPlay:WINDow2:TEXT:CLEar command clears the data and
allows the <feed> to reappear.
If you send a null string ("") with the DISPlay:WINDow2:TEXT[:DATA]
command, it has the same effect as sending the
DISPlay:WINDow2:TEXT:CLEar command.
Sending a text message to the display overrides the display state (see
DISPlay[:WINDow[1|2][:STATe]] command); this means that you can
display a message even if the display is turned off.
Pressing the Local key on the front-panel clears the text message. To
prevent this, use the SYSTem:LOCK:REQuest? command to lock the front
panel keypad.
The front-panel display is automatically cleared when power is cycled, after
a Factory Reset (*RST command), or after an Instrument Preset
(SYSTem:PRESet command).