SPI Common Extensions Manual

SPI Common Extensions Manual—427508-001
3-1
3 Subsystem Control Point
Subsystems that adopt the extended SPI protocol have the option to receive
commands and send responses through a routing process called the Subsystem
Control Point (SCP).
The SCP process:
•
Enforces command security
•
Supports tracing
•
Checks for version incompatibilities
•
Reduces the number of opens that management application and subsystem
processes must maintain
Subsystems, including those using the extended SPI protocol, are not required to use
an SCP process. Instead:
•
A subsystem can choose to accept commands directly from management
applications and return responses without an intermediary.
•
Subsystem or management application programmers can provide their own routing
process.
To determine whether a particular subsystem routes commands and responses
through an SCP process, see the management programming manual for that
subsystem.
For information about starting and managing an SCP process, ZSCP data definitions,
and ZSCP events and errors, see the Subsystem Control Point (SCP) Management
Programming Manual .