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 21:
RTS
Programming Procedures:
When
PARAMETER 20
is entered, [DTR HANDSHAKE OFF] will be
displayed with [OFF] flashing. Toggling between [ON] and [OFF] is
accomplished by pressing the
NEXT
key or the
MANUAL/PREVIOUS
key.
Advancing to Next Parameter:
After programming
PARAMETER 20,
press the
N
key to advance to
PARAMETER 21 –
the next parameter in
Category C
.
The CP-220A displays the parameter just programmed ([PARAMETER
NUMBER 20]) with its first digit flashing, indicating its request for the
next parameter number. Press either:
•
2
then
1
, or
• then
key and
1
, or
• the
key
NOTE: When
the
is used, the
name
of the next parameter appears
immediately – not its
number.
RTS HANDSHAKE OFF MM/DD/YY HH:MM:SS
Background:
Like
PARAMETER 20,
PARAMETER 21,
if enabled, provides the CP-220A
with a basic means of verifying that the
Automation System's
computer is
capable of communicating with it – by monitoring another voltage level
known as
RTS
(Request to Send).
Although somewhat more complex than
the
DTR
technique found in
PARAMETER 20,
it still relies on the presence
of a voltage level from the computer to indicate that communication
between the two devices is possible. Before enabling
PARAMETER 21,
be
sure that the
Automation System's
computer is capable of providing a
sustained
RTS
level for use by the CP-220A for this purpose.
The default, [RTS 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: Here,
RTS
refers to
Request to Send
– the term used by the
RS-232
protocol – to indicate the readiness of the CP-220A to receive data
from the
Automation System's
computer
.
See page 2-74 for
additional information pertaining to
RS-232,
and
PARAMETER 20
for additional details on this parameter.
CP-220A Central Station Receiver
Section 2: Programming the CP-220A Page 2-89
Hook-Up and Installation Manual