Language Reference

TRA/TRB/TRC

Description The TRA, TRB, and TRC commands send or receive trace-amplitude information for trace A, B, or C. Trace A is described below. Traces B and C

operate the same way. To store an amplitude value in one or more points of a trace, follow TRA by amplitude values for each point. Values are stored starting with the ￿rst point.

When number (refer to the syntax diagram) is used to store trace data (for example, TRA -20 DBM,-21DBM ), the units for stored data can be speci￿ed as shown in the syntax diagram (such as, dB, dBm), provided that the trace data format is in its preset mode, TDF P. If TDF B, TDF A, TDF I, or TDF M has been executed, numbers are stored in measurement units. If relative-amplitude mode is active, stored data is in dB.

When #A or #I (block data ￿elds) store trace data, the units for the stored data are measurement units, and are interpreted as bytes or words, as speci￿ed by the MDS command. When TRA is used to store block data in a trace, TRA overrides any format selection made with the TDF command.

To query the value of a single trace element, follow TRA by the trace element position, in position units, and a question mark. The value queried is in parameter units, unless the trace-data-format command, TDF, speci￿es measurement units. The amplitude-units command, AUNITS, can also specify the type of parameter units queried.

Data in ASCII Format (TDF P or TDF M)

7-501