16
Series 1ZC Communicating Sub-Panel Temperature Controller
The value of the checksum shall be
represented by the Message Code
Numbering System.
Message code numbering system:
100 = AØ
101 = AI
110 = BØ
It is illustrated in parameter table.
Examples of the responses to these
requests are given in later sections on
Response Messages.
The Write Request
Note:
Temperature values must be in
currently selected units (°F, °C, °K or
custom units). This selection is
determined by parameter number B9.
The Write Request is used to modify
parameter values and it has the following
message format: [START CHAR][ID]
[ZONE] [TYPE][PARAM][DATA]
[CHKSUM][END CHAR]
Field Description:
TYPE–
This field must contain one of the
following two characters.
W–
Value in DATA is a positive value.
w–
Value in DATA is a negative value.
DATA–
A six-character ASCII
representation of a numeric value.
Request Message
Description
$Ø1Ø1WØ91Ø.123G7<CR>
Change both
the RAM and
EEPROM
copies of
Setpoint #1 in
controller #1
to the value of
10.123
Communications
Message Examples
The Read Request
The Read Request is used to query
parameter values and it has the following
message format:
[STARTCHAR][ID][ZONE][TYPE][PARAM]
[CHKSUM][END CHAR]
Field Description:
TYPE Must contain the uppercase letter ‘R’.
Request Message
Description
$Ø1Ø1RØ5C1<CR>
Queries the value
of the Process
Variable of
Controller #1.
$Ø1Ø1RØ9C5<CR>
Queries the value
of the EEPROM
Setpoint 1 of
Controller #1
$Ø2Ø1RØ9C6<CR>
Queries the value
of the EEPROM
Setpoint 1 of
Controller #2.
END CHAR
CHKSUM
PARAM
TYPE
ZONE
ID
START CHAR
Checksum
The formula for the checksum is:
Checksum =
SUM_OF_MESSAGE_ASCII_
VALUES % 256
Where SUM_OF_MESSAGE_ASCII_
VALUES Is the sum of the ASCII values
of all characters in the message
(excluding the Start Of Message, the
End Of Message, and the checksum
characters). Stop and parity bits are not
used to compute this sum. % Is the
modulus operator.
