Relay Control
These SCPI commands and queries allow to obtain information about modules and to control their
relays.
In a master/slave configuration, all commands listed in this section affect both the master and the
slave mainframe.
Access to modules with relays is provided with the “
:RELay
” branch of the SCPI tree. Access to the
individual relays of such a module is provided in the sub-branch “
:SWITch
” (to avoid confusion with
the existing “relay” branch).
Module Identifier Strings
Some of the SCPI commands act on a module, and require a
module identifier string
to identify that
module.
A module can either be identified by its index, or by its slot index:
•
"<index>"
: the index of the module (0-based), regardless in which slot it is mounted (i.e.
empty slots are not counted)
•
"<slot>!"
: the index of the slot (0-based) in which the module is mounted; slave frames
start at 5
For some examples of module identifier strings, see figure 9.
"5!"
: the module in the 1
st
slot of the slave frame
Example for the usage of module identifier strings:
•
:REL:SER? "2!"
returns the serial number of the module in the 3
rd
slot (see also page
If an identifier is provided that does not match any module, an error is caused.
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Figure 9: Module identifier string examples
