Addresses; Physical Address; Virtual Address - Comtech EF Data DT-4500 Series Installation And Operation Manual

DT-4500 Series C- and Ku-Band Down Converters
Serial Interface Operation
converters may be mixed on the cable as long as each has a unique device
address. In order to indirectly address an online converter in the subsystem, you
must provide a virtual address. The virtual address corresponds to the
converter's position in the chain, beginning with the number 1. Only a backup
converter can recognize virtual addressing.
For control via the EIA-232 interface, your M&C PC must have one EIA-232 port
for each backup converter. You must establish virtual addressing by remote
command. All converters, including the backup converter, must be in the
Redundancy Mode.

8.4 Addresses

All converters 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.
8.4.1

Physical Address

Each converter 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 255. The physical address is entered into a converter via the
front panel. For direct access, the physical address is the only address required
to command a converter. A backup converter or a standalone converter can only
be accessed with a physical address.
• EXAMPLE: 10 (Addresses converter whose physical address is 10.)
8.4.2

Virtual Address

In order to access a converter controlled by a backup converter indirectly, a
virtual address is required. A virtual address is appended to the physical address
of the backup converter with a "V". The virtual address is a number from 1 to 12
and corresponds to the position of the active converter from the backup
converter and is assigned by a configuration command.
• EXAMPLE: 10V3 (Addresses the third converter controlled by the backup
converter whose physical address is 10.)
8–4
MN/DT4500.IOM
Revision 2