Features and Functions 2
34980A User’s Guide 81
• A sequence name can contain up to 30 characters. The first character
must be a letter (A- Z), but the remaining 29 characters can be letters,
numbers (0- 9), or an underscore ( _ ). Blank spaces are not allowed.
• When stored in memory, the user- defined sequence names are
converted to all uppercase letters. For example, when stored “MySeq_1”
is converted to “MYSEQ_1”.
• A sequence may invoke another sequence, but may not invoke itself
recursively. In addition, the number of invocations is limited to four
levels of nesting and this is enforced at the time of execution.
Exceeding the limit will abort the sequence and an error will
be generated.
• At the time of sequence definition, a sequence may reference another
undefined sequence; however, at the time of execution an error will be
generated if an undefined sequence is invoked.
• Up to 500 unique sequences can be stored in non- volatile memory.
Each sequence is limited to 1024 bytes.
• While a scan is running (see “Scanning” on page 43), the instrument
prevents use of all channels in banks that contain one or more
channels in the specified scan list (these channels are dedicated to
the scan). Therefore, if a sequence attempts to operate a channel in
a scanned bank, an error is generated and the entire sequence will
be discarded.
• If the command overlap function is enabled, all switching operations
within the sequence follow the overlapping rules. If the command
overlap function is disabled, all commands within the sequence are
processed in a serial fashion in the exact order in which they are
received. Note, however, that within a single command containing a
<ch_list> parameter (e.g.,
ROUT:CLOSE (@1001:1010)), the order of the
individual switch operations is not guaranteed.
Remote Interface Operation: The following command defines a sequence
named “MYSEQ_1”, which closes several channels on the module in slot 1
and opens a single channel on the module in slot 2.
ROUT:SEQ:DEF MYSEQ_1,"ROUT:CLOS (@1001:1009);OPEN (@2001)"
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