User Manual DDS200 Digital Demodulation System 070-9952-00

Remote ControlExample: Special numeric values. The parameters DEFault, UP and DOWN are interpretedas special numeric values.DEFDEFault denotes a preset value stored in the EPROM. This value coincideswith the basic setting called up by the *RST command.UP/DOWNUP or DOWN increments or decrements the numeric value by one step.INF/NINFINFinity, Negative INFinity (NINF) represent the numeric values –9.9E37 or9.9E37. INF and NINF are sent as device responses only.NANNot A Number (NAN) represents the value 9,91E37. NAN is emitted asdevice response only. This value is not defined. Possible causes are thedivison of zero by zero, the subtraction of infinity with infinity and therepresentation of missing values.Boolean parameters. Boolean parameters represent two states. The ON state (truecondition) is represented by ON or a nonzero numeric value. The OFF state(false condition) is represented by OFF or the value of 0. Queries always return 0or 1.Example:Setting command:Query:Response: Character data. Character data follow the syntax rules for keywords and have ashort and a long form. Similar to other parameter, they must be separated fromthe header by a white space. A query returns the short form of the character data.Setting command:Query:Response: Block data. Block data is a format suitable for the transmission of large datavolumes. A command with a block data parameter has the structure shown in thefollowing example.3–10 DDS200 Digital Demodulation System User Manual