Tabor Electronics 5251, User Manual

Page: 191 / 298

4
Remote Programming Reference
Modulated Waveforms Control Commands
4-57
The 5251 will return the present baud value. The returned value will be in standard scientific format (for
example: 100kHz would be returned as 100e3 – positive numbers are unsigned).
ASK:FREQuency:MARKer<index>(?)
Description
Programs where on the data stream the 5251 will generate a pulse, designated as ASK marker, or index
point. The marker pulse is generated at the SYNC output connector. Note that if you intend to program
marker position, you must do it before you load the ASK data list.
Parameters
Name Range Type Default Description
<index> 1 to
1000 Numeric
(integer only) 1
Programs a marker pulse at an index bit position.
Response
The 5251 will return the present marker position.
ASK:DATA<ask_data>
Description
Loads the data stream that will cause the 5251 to hop from one amplitude level to shifted amplitude level
and visa versa. Data format is a string of "0" and "1" which define when the output generates base level
and when it shifts amplitude to the ASK value. "0" defines base level amplitude,"1" defines shifted amplitude
level. Note that if you intend to program marker position, you must do it before you load the ASK data list.
Below you can see how an ASK data table is constructed. The sample below shows a list of 10 shifts. The
5251 will step through this list, outputting either base or shifted amplitudes, depending on the data list: Zero
will generate base level and One will generate shifted amplitude. Note that the waveform is always
sinewave and that the last cycle is always completed.
Sample ASK Data Array
0 1 1 1 0 1 0 0 0 1
Parameters
Name Type Description
<ask_data> ASCII Block of ASCII data that contains information for the
generator when to shift from base to shifted
amplitude and visa versa.
Frequency
Use the following command for programming the frequency hop