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R&S
NGE100B
6.3.2.6
6.3.3 Structure of a Program Message
6.3.4 Responses to Queries
User Manual 5601.1343.02 ─ 02
Block Data
Block data are a transmission format which is suitable for the transmission of large
amounts of data. A command using a block data parameter has the following structure:
Example:
HEADer:HEADer #45168xxxxxxxx
ASCII character # introduces the data block. The next number indicates how many of
the following digits describe the length of the data block. In the example, the four fol-
lowing digits indicate the length to be 5168 bytes. The data bytes follow. During the
transmission of these data bytes all end or other control signs are ignored until all
bytes are transmitted.
A program message may consist of one or several commands. It is terminated by the
program message terminator which is the NL (New Line) character for LAN and USB
connections.
Several commands in a program message must be separated by a semicolon ";". If the
next command belongs to a different command system, the semicolon is followed by a
colon. A colon ":" at the beginning of a command marks the root node of the command
tree.
A query is defined for each setting command unless explicitly specified otherwise. It is
formed by adding a question mark to the associated setting command. According to
SCPI, the responses to queries are partly subject to stricter rules than in standard
IEEE 488.2.
●
The requested parameter is transmitted without header.
Example
VOLTage:PROTection:MODE?
Response: PROT
●
Maximum values, minimum values and all further quantities, which are requested
via a special text parameter are returned as numerical values.
Example
FUSE:DELay? MAX
Response: 250
●
Numerical values are output without a unit. Physical quantities are referred to the
basic units or to the units set using the Unit command.
Example
FUSE:DELay? MIN
Response: 0 (for 0 ms)
●
Truth values <Boolean values> are returned as 0 (for OFF) and 1 (for ON).
Example
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SCPI Command Structure and Syntax
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