Parameter 20: Dtr - Honeywell FBII CP-220A Hookup And Installation Instructions

REMEMBER!
To leave the Programming
Mode at any time, press the
Esc key. Doing so will
return the CP-220A to its
normal operating mode.
Programming changes will
be stored automatically.
PARAMETER 20:
DTR
Page 2-88 Section 2: Programming the CP-220A CP-220A Central Station Receiver
Default:
PARAMETER 14 is defaulted to [00], which disables the function.
Advancing to Next Parameter:
The next parameter in Category C is PARAMETER 20. Because it is not
sequential, it cannot be reached with a single press of the
advance to PARAMETER 20, press the N key.
The CP-220A displays the parameter just programmed ([PARAMETER
NUMBER 14]) with its first digit flashing, indicating its request for the
next parameter number.
You can reach PARAMETER 20 by pressing the 1 key and the 3 key.
DTR HANDSHAKE OFF MM/DD/YY HH:MM:SS
Background:
PARAMETER 20 provides a fundamental means of verifying that the
Automation System's computer is operating and is connected to the
CP-220A. If enabled, PARAMETER 20 allows the CP-220A to use its DTR
connection point to detect the presence of an external voltage level – also
known as DTR – originating at the computer, which is delivered via the
cable connecting the two devices. This voltage level will be continually
monitored by the CP-220A, which, as long as it's present, confirms two
basic conditions:
• power is applied to the Automation System
• the cable running between the Automation System and the
CP-220A is secure
NOTE: DTR refers to Data Terminal Ready, the term used by the RS-232
protocol to indicate the readiness of a computing device for
communications. See page 2-74 for additional information
pertaining to RS-232.
While these two checks are only rudimentary, they do provide a basic form
of supervision between the two components (which is supplemented by
PARAMETER 21).
Note that the default, [DTR HANDSHAKE OFF], must be used under any
of the following conditions:
• when there is no Automation System present
• if such supervision is not desired
• if the Automation System does not provide a DTR voltage level
for use by the CP-220A
NOTE: If PARAMETER 20 is enabled, the computer's DTR level must be
enabled, as well.
Hook-Up and Installation Manual
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