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<Toc> <Ind> <5. MODBUS Communication >
5-5
IM 77J01J11-01E 3rd Edition : Oct. 15, 2007-00
03 Reads data from multiple D registers.
● Function
This function code reads the contents of successive D registers by the specified number of
them starting at a specified D register number.
• The maximum number of D registers to be read at a time is 64.
• For the format of responses in the event of failure, see subsection 5.2.2.
● Message (for normal operation)
Number of bytes in RTU mode
Number of bytes in ASCII mode
None 11 2
4122
Error
Check
2
End of Message
Mark (CR+LF)
None
Element Start of
Message Mark
(:)
Address
Number
(ADDRESS)
Function
Code (03)
D-Register
Start Number
Number of
D Registers
2
4
22
Message (continued)
050204E.EPS
● Response (for normal operation)
Response (continued)
Element Start of
Message Mark
(:)
Address
Number
(ADDRESS)
Function
Code (03)
Byte
Count
Contents of
D-Register
• • •
Number of bytes in RTU mode None 1112• • •
12 224Number of bytes in ASCII mode • • •
Contents of
D-Register
Error
Check
End of Message
Mark (CR+LF)
None22
224
050205E.EPS