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TA
Transfer A
The TA command transfers trace A amplitude values, in display units, from the analyzer to the controller. The
display unit values are transferred in sequential order (from left to right) as seen on the CRT display. Display unit
values that are stored in the display memory can be transferred to the controller in any one of the four output
formats of the analyzer (01,02,03, or 04).
Transfer of trace amplitude data should only be done as follows:
1.
Select single sweep mode (S2).
2.
Select desired analyzer settings.
3.
Take one complete sweep (TS) .
4. Transfer data.
This procedure ensures that the current settings of the analyzer are reflected in the transferred data.
When the TA command is executed, and the analyzer is in continuous sweep mode, the blank-ahead marker is
and 04 formats.
The blank-ahead marker is composed of positive, blanked amplitude values and is immediately ahead of the
updated, sweeping trace. These values represent the amplitude responses of the previous sweep, plus 2048.
Thus, they are off (above) the screen.
The blank-ahead marker is eight display units wide and is transferred as such. For example, if an amplitude value
of 100 falls within the blank-ahead marker area when the sweep is transferred, the amplitude value becomes 2148
(amplitude value 100 + data word 2048, in which bit number 11 of graph data is positive blanked). For further
information on data word coding see Consolidated Coding Data in Appendix B.
When transferring amplitude data, only the data words from 1001 display memory addresses are transferred out
of the total of 1024 available display memory addresses. Each of the 1024 display memory addresses contains a
single data word. The 23 data words not transferred are at address 0 (used for the control instruction word) and at
addresses 1002 through 1024 (not used by the analyzer for trace data, but available for programming custom
graphics or labels).
The sample program below demonstrates how to store a trace similar to the one in the following illustration.
330 Programming
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