
<Toc> <Ind> <5. MODBUS Communication >
5-5
IM 77J04J11-01E 1st Edition : 2006.08.25-00
03 Reads data from multiple D registers
● Function
Reads the contents of a sequence of contiguous D registers by the specified number of D
registers, 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 response 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 1 1 2
4122
Error
Check
2
End of Message
Mark (CR+LF)
None
Element Start of
Message Mark
(:)
Address
Number
(ADR)
Function
Code (03)
D-Register
Start Number
Number of
D Registers
2
4
22
Message (continued)
● Response (for normal operation)
Response (continued)
Element Start of
Message Mark
(:)
Address
Number
(ADR)
Function
Code (03)
Byte
Count
Contents of
D Register
Number of bytes in RTU mode None 1 1 1 2
12 224Number of bytes in ASCII mode
Contents of
D Register
Error
Check
End of Message
Mark (CR+LF)
None22
224
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