connections between the equipment, along with the kind of control,
timing, and data signals that are required to transfer and exchange
data in a
serial
fashion – one
bit
(binary digit) at a time (see
Appendix
A
).
RS-232-C,
or "serial" interfaces, which adhere to this standard, are
incorporated into almost all mainframe computers, mini-computers,
modems, PCs, and their peripherals. Both the CP-220A's
DTE
(Data
Terminal Equipment) port to which the
Automation System
will be
connected, and its
DCE
(Data Communications Equipment) port (see
pages 1-11 and 1-14) support
RS-232-C
.
The DTE Port
The
DTE
connector, along with the proper cable, transfers the "raw"
data processed by the CP-220A directly to the
Automation System's
serial communications (
RS-232
) port. Not surprisingly, the cable
connecting the equipment is known as an
RS-232
or
serial
cable. The
end of this cable at the CP-220A is a 25-pin "DB"-type (male)
connector. Its other end varies according to the type of serial port
provided by the computer: It may have between 9 and 25 "pins/holes"
and be either
male
or
female
. While most mini-computers and PCs
follow the
RS-232-C
protocol in terms of their serial port
configuration, it's best to verify this by consulting the computer's
documentation before connecting them to the CP-220A.
Note that FBI manufactures its No. 133 – which is a UL-Listed,
custom-made cable providing the proper wiring and required
connectors – for this purpose.
Parameter Programming
A complete guide to programming the 26 parameters in
Category C
(see the left-hand column on page 2-73) will be covered in this section.
As with all the parameters previously discussed in this manual, you
will be provided with:
• background information
• programming options
• an explanation of the default
• the next logical parameter in
Category C
Page 2-74 Section 2: Programming the CP-220A CP-220A Central Station Receiver
Hook-Up and Installation Manual