Silent Knight FSK
IMPORTANT!
On page B-5, a technique known as
FSK
(Frequency Shift
Keying)
was briefly explained.
FSK
uses two distinct, but
very brief, tones to provide the "0s" and the "1s"
representing the binary digits (bits) that form the
characters comprising the subscriber messages. Three of
the
FSK
Reporting Formats recognized by the CP-220A
have been developed by
Silent Knight
and are known,
respectively, as
Silent Knight FSK 0, FSK 1,
and
FSK 2
(also called
FSK 6
).
Each of these formats has been incorporated into the CP-
220A's software on its
REC-5 Memory Card
(Version 3.0
and above) and on its
REC-11 Line Cards,
as well.
NOTE 1: The
Silent Knight FSK
formats operate only when
the CP-220A is in the "FBI mode," as selected by
PARAMETER 02
(see Section 2, page 2-76).
NOTE 2: The
Silent Knight FSK
formats are not available
on the
REC-1
Line Cards.
FSK 0
FSK 0
is a straightforward
4x1
format, in which the first
four characters are the subscriber's
Account Number,
and
the last character is the
Event Code.
For additional
information, see the discussion on the
4x1 Standard
Format,
discussed on pages B-10 through B-11.
FSK 1
FSK 1
is similar to the
4x2
format (discussed on page
B-16), in which the first four characters are the
subscriber's Account Number, and the last two digits are
the
Reporting Code,
comprised of a single-digit
Event Code
and a single-digit
Descriptor
.
When the CP-220A receives data in the
FSK 1
format, it
displays the subscriber's Account Number and the English
language messages corresponding to each of the two-digit
Reporting Codes
discussed in the table that follows. Note
that these codes and their resulting messages are
dedicated to the
FSK 1
format and cannot be changed by
re-programming the CP-220A.
CP-220A Central Station Receiver Appendix B:
Page B-23
Hook-Up and Installation Manual
Communication Formats
