Crestron CT-3000 Especificações descarregar pdf (Página 55)

Crestron e-control Database Manager SW-DBM

55 •• Appendices Installation & Reference Guide — DOC. 5823

Base 16 used for notational purposes

Straight base 2 notation (a long string of 0s and 1s) is considered to be too unwieldy

to be useful to the human eye as it is too easily prone to misrepresentation and

misinterpretation. Hexadecimal (base 16) notation is used to conveniently specify the

bit patterns for the signals that use them (i.e., the Config and SignalA

signals).

Hexadecimal groups all sixteen bits into four sets of four bits each, assigning the

base 10 digits 0 to 9 plus the first six letters of the alphabet A to F to the sixteen

possible combinations of the four bits.

For example, the sixteen-bit (base 2) pattern

0 0 0 0 0 0 0 1 1 1 0 1 0 1 0 1

can be broken into the four four-bit sets

0000 0001 1101 0101

which get assigned to them the four hexadecimal “hex digits”

0 1 D 5

Note that D stands for the quantity we normally express in base 10 as thirteen (13).

Therefore, the above bit pattern is referred to conveniently as $01D5, or since

leading zeros are optional in any base, $1D5. The missing (high-order) bits are

assumed to be 0000. Although $1D5 represents a quantity — which happens to be

four hundred sixty-nine (469) in base 10 — again, we are only interested in bit

patterns here, not the quantities they may represent.

Error Reporting

At this time error handling is a little haphazard, with some errors being tallied back

to the control system, while others are logged in the Server Monitor window.

Tallied Errors

A descriptive string is sent with all errors (via ErrString). However, while some are

accompanied with error numbers (via ErrNumber + ErrTrigger), some are not.

Log Items

The log is intended for after-the-fact analysis of important events. The log is an in-

memory FIFO list (first in, first out). When the log approaches capacity, log items

are removed, one by one, starting with the oldest items first, until there is enough

room for the new item.

All logged items are preceded with either a per-cent sign (%) or a dollar sign ($).

Items preceded with % are informational. Items preceded with $ are errors, reflecting

unanticipated situations.

Signal Summary

The “Signal Reference,” below, is an alphabetical list of all signals from both

COM Settings and Scroller signal blocks.

Certain signal names are used in both types of signal blocks. However, only one

entry for each signal type appears in the reference. Among these are the Done signal

and the three error signals (ErrNumber, ErrString, and ErrTrigger). This identical

naming reflects the fact that these signals function similarly regardless of where they

appear.

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