Access Methods; Direct Access; Indirect Access - Comtech EF Data KPA080 Installation And Operation Manual

KPA080 Ku-Band Solid-State Power Amplifier
5.6

Access Methods

The SSPA may be accessed directly by using a physical address or indirectly through a
backup SSPA in a redundant configuration using a virtual address.
5.6.1

Direct Access

SSPAs may be directly accessed by the EIA-232 interface or by the EIA-485 interface in
a buss configuration.
EIA-485
EIA-232
5.6.2

Indirect Access

SSPAs in Redundancy Mode may be addressed indirectly by adding a virtual address to
the backup SSPA's physical address. The virtual address corresponds to the SSPA's
position in the redundant subsystem. The backup SSPA recognizes the virtual address
and executes the command via the dedicated serial link between itself and the targeted
SSPA. This addressing mode is provided to reduce cabinet wiring complexity by
allowing remote access to either both SSPAs (in a 1:1 redundant subsystem) or all three
SSPAs (in a 1:2 redundant subsystem) using a single EIA-232 or EIA-485 connection to
the backup SSPA.
Note: Due to memory limitations, virtual addressing is not fully functional in a KPA080
1:2 system. Contact the factory for specific information. Virtual addressing is fully
functional in a KPA080 1:1 system.
Rev. 0
In this control network, the SSPA is paralleled on a common EIA-485 cable, and has a
unique physical address. Only one EIA-485 port is required on the system's monitor and
control computer.
For EIA-232 control, a direct EIA-232 cable connection is made to each SSPA to be
accessed. If an external Monitor and Control Computer is used, one EIA-232 port per SSPA
is required.
Remote Control
5-5