Omron WT30 Operation Manual page 97

Detailed Description of the Services
Note
Service Response PDU
MRC SRC
Response code
0 1 0 1
2 2 4
Variable Type and Read Start Address
For details on variable types and read start addresses, see 6-4 Variable Area
(Setting Range) List on page 86.
Bit Position
The WT30 does not support bit access. Fixed to "00."
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 com-
pletion."
0001 to 0044 The read operation is performed, and processing ends in "normal
completion."
If the read start address is within the variable area, but the read end address
(read start address + number of elements) exceeds the end address of the
variable area, reading will be completed normally, provided that the number of
data is within the specified range for the number of elements. Refer to the fol-
lowing information.
• When the end address is specified as the read start address for two data
elements, only the end address will be read (variable type 80 in this exam-
ple).
Address
003E
Read start address →
003F
Read end address →
Response Code
Response
code (hex)
1001 Command too long
1002 Command too short
1101 Area type error
1103 Start address out-of-range error The read start address is out of
110B Response too long
1100 Parameter error
Read data
(for number of elements)
0 or 4 × Number of elements
Processing
Variable Area
* * * * * * * *
* * * * * * * *
Error name
The command is too long.
The command is too short.
The variable type is wrong.
range.
The response exceeds the com-
munications buffer size.
• The number of elements is
larger than 0044.
Other parameter error has
occurred.
• Bit position is not "00."
Section 6-3
← End address
Cause
79