PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY
PROGRAMMER MANUAL
9
command identifies it as a query.
Layer D is interrelated with device information. Different devices have
different functions. SCPI command sets belong to this layer.
Command Synta x
If you want to transfer any instructions to an instrument, and comply
with SCPI, there are three basic elements must be included.
l
Command header
l
Parameter (if required)
l
Message terminator or separator
Command Header
The command header has a hierarchical structure that can be represented
by a command tree (Figure 4).
The top level of the tree is the root level. A root node is located at the
root level. A root node and one or more lower-level nodes form a header
path to the last node called the leaf node.
Figure 4: Tree hierarchy
Leaf node
:SYSTem
:AUTO
Root node
:ERRor
:STATe
:STARt
:CYCLe
Lower-level node
Leaf Node
PST & PSS & PSH SERIES PROGRAMMABLE POWER SUPPLY
PROGRAMMER MANUAL
10
The command header is configured by header path and leaf node. Figure 5
shows the command header for the leaf node indicated in Figure 4.
Figure 5 Command Header
Parameter
If the commands have parameters , the values have to be included. In this
manual, when we expressed the syntax of the command, the < > symbols
are used for enclosing the parameter type. For instance, the syntax of the
command in Figure 6 includes the Boolean parameter type.
NOTE: Do not include the <, >, or | symbols when entering the actual
value for a parameter.
Figure 6 Command Header with Parameter
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