Parameter 09: Serial Baud - Honeywell FBII CP-220A Hookup And Installation Instructions

PARAMETER 09:
Serial Baud
The next parameter in Category C is PARAMETER 09. Because it is not
sequential, it cannot be reached with a single press of the
advance to PARAMETER 09, press the N key.
The CP-220A displays the parameter just programmed ([PARAMETER
NUMBER 02]) with its first digit flashing, indicating its request for the
next parameter number. Press either:
• 0 then 9 , or
• the
SERIAL BAUD IS 1200 MM/DD/YY HH:MM:SS
Background:
In PARAMETER 09, the Serial Baud Rate specifies the speed at which data
is transferred between the CP-220A and the Automation System, and
roughly equates to the number of bits per second being transferred. Unless
the Baud Rate is set to the same value for both the CP-220A and the
Automation System, errors in the transmission may occur. The higher the
Baud Rate, the faster the data will be exchanged, but if the Baud Rate is
set too high for either (or both) device(s), the data is likely to be garbled
when received. The chosen setting should take into account the interaction
of several factors:
• the maximum Baud Rate available to each device (usually 19,200 with
RS-232)
• the length of the cable connecting the two devices (the higher Baud
Rates are most affected by a cable's electrical capacitance, which
increases with its length); if possible, keep the length of the connecting
cable to less than 100 feet
• the results obtained under actual operating conditions
Programming Procedures:
The Serial Baud Rate should be set to match that which was chosen for the
computer. Any of 8 Baud Rates ([110], [300], [600], [1200], [2400], [4800],
[9600], [19.2]) are available, and can be obtained by pressing either the
NEXT key or the MANUAL/PREVIOUS key, as required.
NOTE: The [19.2] designation refers to 19.2 kilobaud – 19,200 baud.
Default:
PARAMETER 09 is defaulted to [1200]. Because of the limited amount of
data being transferred between the CP-220A and the Automation System,
there is no significant advantage in using the higher baud rates.
CP-220A Central Station Receiver
Hook-Up and Installation Manual
key and 9
Section 2: Programming the CP-220A Page 2-77
key. To