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2 CompoWay/F Communications Procedures
2 - 8
E5@C Digital Temperature Controllers Communications Manual (H175)
2-3 Detailed Description of the Services
This service reads data from the variable area.
• Service Request PDU
• Service Request PDU
(1) Variable Type and Read Start Address
For details on variable types and read start addresses, refer to
Section 3 Communications Data for
CompoWay/F
.
(2) Bit Position
Bit access is not supported. Fixed to “00.”
(3) Number of Elements
(4) Response Code
• Normal Completion
2-3-1 Read Variable Area
Number of elements Processing
0000
The read operation is not performed (read data is not
appended to the service response PDU), and processing
ends in a normal completion.
Double word
(variable type C0, C1, or C3)
0001 to 0019
(1 to 25)
The read operation is performed and processing ends in a
normal completion.
Word
(variable type 80, 81, or 83)
0001 to 0032
(1 to 50)
Response code Name Description
0000 Normal completion No errors were found.
MRC SRC
0 1 0 1 0 0
2 2 2 2 4 4
Variable
type
Read start
address
Bit
position
Number of
elements
2 2
MRC SRC
0 1 0 1
4
Response
code
Read data (for number
of elements)
Number of elements
×
8 or 4