SPI Programming Manual (G06.24+, H06.03+, J06.03+)

Introduction to SPI
SPI Programming Manual—427506-006
1-5
SPI Message Protocol
A subsystem does not need to communicate directly with management applications.
Instead, a subsystem can have its commands and responses routed through an
intermediate process, as shown in Figure 1-4 on page 1-6. The SPI common
extensions provide such a process: the Subsystem Control Point. (See the
SPI
Common Extensions Manual
.)
In any configuration, SPI provides the management interface between the
management application, the subsystem manager process, and any intermediate
process.
SPI Message Protocol
The basic SPI protocol specifies:
•
How SPI requesters and servers process messages
•
What information must appear in a message
•
Whether or not that information must be sent in a specific token
Figure 1-3. Subsystem Manager Communicating With Multiple Management
Applications
Legend
SPI Command
SPI Response
Subsystem
Manager
Management
Application
Management
Application
Management
Application
Subsystem
Process
Subsystem
Process
Subsystem
Process
A subsystem manager can support concurrent SPI communications with multiple management applications.