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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.
Page 2-84 Section 2: Programming the CP-220A CP-220A Central Station Receiver
NOTE: See PARAMETER 11 (on page 2-79) for information on ASCII
coding and the ASCII Character Set.
In terms of the Automation System and the CP-220A, a [NAK] will be sent
back to the receiver by the computer if it (the computer) was unable to
process the data it received. There are many reasons why this may occur.
Usually it is caused by a character string whose format is not recognized by
the computer. Once a [NAK] is received by the CP-220A, it will repeat the
data transfer up to 10 times, until an [ACK] is received. If an [ACK] is not
received by the CP-220A after 10 tries, the receiver will display a
[COMPUTER FAIL].
NOTE: This aspect of the system's operation is not programmable.
Programming Procedures:
When PARAMETER 17 is entered, [NAK 00] will be displayed, indicating
(via the use of [00]) that the [NAK] feature has been factory disabled – the
default arrangement (in which it is assumed that an Automation System is
not in use). If there is an Automation System, any ASCII value between [01]
and [FF] may be programmed to represent the [NAK], although the ASCII
[15] character is normally used to convey the Negative ACKnowledgement
character.
NOTE: Whatever ASCII character is used to provide the [NAK] must be
the same for both the CP-220A and the Automation System.
In any case, the first of the two digits will be flashing; to change the
character, use the NEXT key or the MANUAL/PREVIOUS key, as required.
Once this is done, use the
use either the NEXT key or the MANUAL/PREVIOUS key to change it, if
necessary. Subsequent movement between the two digits can be
accomplished through the use of the
Default:
PARAMETER 17's default disables the Negative ACKnowledgement [NAK]
character through the use of ASCII [00].
Advancing to Next Parameter:
After programming PARAMETER 17, press the N key to advance to
PARAMETER 18 – the next parameter in Category C.
The CP-220A displays the parameter just programmed ([PARAMETER
NUMBER 17]) with its first digit flashing, indicating its request for the
next parameter number. Press either:
• 1 then 8 , or
• then
key and 8 , or
• the
NOTE: When the
immediately – not its number.
key to move to the second digit. As before,
key or the
key
is used, the name of the next parameter appears
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key.
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