HP 34970A manual 144

Chapter 4 Features and Functions

System-Related Operations

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For security reasons or for a slight increase in scanning rates, you may want to turn off the front-panel display. From the remote interface, you can also display a 13-character message on the front-display.

∙You can only disable the front-panel display by sending a command from the remote interface (you cannot disable the front panel while in local operation).

∙When disabled, the entire front-panel display goes blank and all display annunciators except ERROR are disabled. All keys except are locked out when the display is disabled.

∙The display is automatically enabled when power is cycled, after a

Factory Reset (*RST command), or when you go to local by pressing .

∙You can display a message on the front panel by sending a command from the remote interface. The instrument can display up to

13 characters on the front panel; if you attempt to send more than 13 characters, an error is generated. You can use letters (A-Z),

numbers (0-9), and special characters like “@”, “%”, “*”, etc. Use the “#” character to display a degree symbol ( ° ). Commas, periods, and semicolons share a display space with the preceding character, and are not considered individual characters. While a message is displayed on the front panel, readings from a scan or monitor are not sent to the display.

∙Sending a message to the display from the remote interface overrides the display state; this means that you can display a message even if the display is turned off.

∙exx Vxytvx bxt”: The following command turns off the front panel display.

DISPLAY OFF

The following command displays a message on the front panel and turns on the display if disabled.

DISP:TEXT ’SCANNING ...’

To clear the message displayed on the front panel (without changing the display state), send the following command.

DISPLAY:TEXT:CLEAR

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