The slow controls protocol allows control panel software
to be built that communicates with slow controls drivers
in the VM-USB raadout framework. This is intended to allow
the contruction of control panels for devices that have slow
controls drivers. Note that the vmusb
controller allows drivers to be written for devices
that don't have slow controls drivers yet.
The slow controls server listens for connections on the port
specified by the Readout program's --port
option or 27000 if that option is not
specified.
Connected clients send commands to the server as lines of text and get back singe line replies. Replies are expected to begin with OK if the request was successful and ERROR otherwise. The text that follows the header text depends on the driver.
Attempts to set a parameter
module-parameter
in a module module-name
to a new value.
module-name is the name
of a module that has been defined by the
control configuration file.
module-parameter
is a parameter that must be recognized by
the driver that manage that module.
value must be a valid
new value for that parameter.
Retrives a parameter (module-parameter)
from a module (module-name).
module-name is the name
of a module that has been defined by the
control configuration file.
module-parameter
is a parameter that must be recognized by
the driver that manage that module.
It is entirely up to the module driver to
decide what is returned, however by
convention, as described above, the string
returned will begin either with
OK or
ERROR.
Returns data that is monitored by the device. Again it is up to the driver to decide exactly what should be returned.