The HEADers? query shall return all SCPI commands and queries and IEEE
488.2 common commands and common queries implemented by the
instrument. The response shall be a <DEFINITE LENGTH ARBITRARY BLOCK
RESPONSE DATA> element The full path for every command and query shall
be returned separated by linefeeds. The syntax of the response is defined as:
The <nonzero digit> and sequence of <digit> follow the rules in IEEE 488.2,
Section 8.7.9. An <SCPI header> is defined as: It shall contain all the nodes
from the root. The <SCPI program mnemonic> contains the node in standard
SCPI format. The short form shall use uppercase characters while the
additional characters for the long form shall be in lowercase characters.
Default nodes shall be surrounded by square brackets ([]).