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The IRD is acting on one of three groups of settings at any given time, each of which is
described in the following table:
Table 8. UNITY500 Settings Groups
Settings
Group
Description
Temp
These settings are entered via COMPEL or the TEMP / TEMPCH terminal
commands. The unit is said to be inserting when it is configured to the temp
settings. The maximum length of an insert is approximately 18 hours (65535
seconds). An insert terminates when (1) it times out, (2) an ABORT command
is received, (3) power is cycled, or (4) an invalid header is seen. Any Temp
commands received while the receiver is currently inserting are ignored. If a
Perm command is received while inserting, the perm settings are updated but
not acted on until the insert is terminated.
Perm
The perm settings are entered via COMPEL, the PERM / PERMCH terminal,
or OSD Carrier Select screen, or automatically from within a search mode (see
below). The perm settings are the only settings group that are stored in
NVRAM.
Search (see
Settings
Table next)
The search settings are active while in Carrier Search or Header Search modes.
When the unit finds what it is looking for in the search mode, it copies the
search settings to the perm settings. These are then considered to be the active
settings.
3.2
SETTINGS TABLE (OR SEARCH TABLE)
This is an internal database retained in non-volatile memory (unaffected by loss of power). It
contains a list of alternate carrier settings. Each valid entry is a complete description of a
carrier/program setting (as used in a PERM command). This list is entered at customer request
at the factory, and may be edited using COMPEL commands or ADDS and DELS terminal
commands. The entries are referred to as “Table entries” or “Search Settings entries”, etc. The
Settings Table is typically used for one of two possible operations. The first is for local users to
quickly pre-program carrier/program combinations and tune the IRD to one of them. The second
is as a source of alternate fallback carriers for times when the “normal” carrier is lost or has a
failure in its COMPEL stream. The Carrier and Header Search IRD modes are examples of this
second operation.
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