Detailed Description Of The Services; Read Variable Area - Omron E5CN Manual

2.3 Detailed Description of the Services

■ Read Variable Area

This service reads data from a variable area.
Service Request PDU
Variable Read
MRC SRC
type
start address
0 1 0 1
2 2 2
Service Request PDU
Response
MRC SRC
code
0 1 0 1
2 2 4
(1) Variable Type and Read Start Address
For details on variable types and read start addresses, see SECTION 3
Communications Data for CompoWay/F and SYSWAY.
(2) Bit Position
The E5CN does not support bit access. Fixed to "00."
(3) Number of Elements
Number of
elements
0000 The read operation is not performed (read data is not
appended to the service response PDU), and processing
ends in "normal completion."
0001 to 0002 The read operation is performed, and processing ends in
"normal completion."
(4) Response Code
Normal Completion
Response code
0000 Normal completion
Error Occurred
Response code
1001 Command too long
1002 Command too short
1101 Area type error
1103 Start address out-of-
range error

2.3 Detailed Description of the Services

Bit
Number of
position
elements
0 0
4 2 4
Read data (for number
of elements)
0, 8, or 16
Processing
Name
No errors were found.
Error name
The command is too long.
The command is too short.
The variable type is wrong.
The read start address is out
of range.
Description
Cause
2-9