Addressess; Physical Address; Virtual Address; Message Structure - Comtech EF Data KPA080 Installation And Operation Manual

Remote Control
5.7

Addressess

All SSPAs are addressed in a command by the Device Address. The Device Address
consists of a physical address or a physical address plus a virtual address.
5.7.1

Physical Address

Each SSPA in the system must have a unique physical address regardless of the access
method used. The physical address consists of a string of 1, 2 or 3 numbers from 1 to
256. The physical address is entered into a SSPA via the front panel. For Direct Access,
the physical address is the only address required to command a SSPA. A backup SSPA or
a stand-alone SSPA can only be accessed with a physical address.
For Example:
5.7.2

Virtual Address

In order to access an SSPA controlled by a backup SSPA indirectly, a virtual address is
required. A virtual address is appended to the physical address of the backup SSPA with
a "V". The virtual address is either the number "1" or "2" corresponding to the SSPA's
designation in a redundant subsystem.
For Example:
5.7.3

Message Structure

The structure of either a Command, Response, or Error Message is as follows:
5.7.4

Start Character

The Start Character begins each message:
5-6
10 Addresses SSPA whose physical address is 10.
10V2 Addresses second SSPA in a 1:2
redundant subsystem controlled by
the backup SSPA whose physical address is 10.
•
Start Character
•
Device Address
•
Command or Response
•
End of Message String
For Example: <
>
KPA080 Ku-Band Solid-State Power Amplifier
Start of a user Command.
Start of a SSPA response.
Rev. 0