Model 2750 Multimeter/Switch System User’s Manual Buffer 6-13
l. FORMat:ELEMents <item list> Select elements for TRACe:DATA?
<item list> = READing, CHANnel, UNITs, RNUMber, TSTamp
The data returned by TRACe:DATA? can include from one to all five data elements shown
in the above item list. For example, if you want the units and reading number included with
the reading, you would send this command:
FORMat:ELEMents READing, UNITs, RNUMber.
Only the elements defined by the list are used. Elements not included in the list are not used.
You can specify the elements in the list in any order, but they must be separated by commas.
The data elements that can accompany the reading are summarized as follows. More details
on data elements are provided in, “FORMat commands,” page 14-2.
• CHANnel — References the reading to a switching module channel. If the reading
is not for a switching module, channel 000 will be returned.
• UNITs — Identifies the measurement function (i.e., VDC).
• RNUMber — References the reading to the buffer reading number.
• TSTamp — Timestamps the reading (ABSolute or DELTa timestamp as set by the
TRACe:TSTamp:FORMat command).
FORMat:ELEMents READing, CHANnel, UNITs, RNUMber, TSTamp, LIMits.
Choose the elements to be outputted with each DATA? or each buffer reading in a
TRAC:DATA?. RNUMber is reading number; TSTamp is Timestamp as set by the
SYST:TSTamp:TYPE command. The other elements should be self-explanatory. The query
acts the same as 2000, except there are six possible elements instead of 3. Therefore, if only
READ is selected, then FORM:ELEMents? returns the string "READ,,,,,". The LIMits are
returned in ASCII format as a four-bit number abcd, where a corresponds to High Limit 2, b
is Low Limit 2, c is High Limit 1, and d is Low Limit 1. A zero in the bit position indicates
a passing limit, while a 1 indicates failure. In the binary formats, the limit information must
be decoded from the value 0-15 returned, where the MSB is High Limit 2 and the LSB is
Low Limit 1. For example, a value of 10 returned in the limits field would indicate that High
Limit 2 and High Limit 1 both failed.
Real-time timestamps are not available for output data formats other than ASCII. The ele-
ment TSTamp can still be selected and will show up when FORM:ELEM? is queried, but no
timestamp will be included in the output data.
2750-900-01.book Page 13 Wednesday, August 3, 2011 7:56 AM
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