20-12
PPC Manual Revision 1
Chapter 20: Modbus Communication
03 Reading multiple D registers
Element
Message
start mark
(:)
Address No.
(ADS)
Function code
(0x03)
Register
start No.
Number
of read
registers
Error
check
Message
end mark
(CR+LF)
1 1 2 2 2
1 2 2 4 4 2 2
Element
Message
start mark
(:)
Address No.
(ADRS)
Function code
(0x03)
Byte count
(Note 1)
Register
content
1 1 1 2
1 2 2 2 4
Register
content
Error
check
Message
end mark
(CR+LF)
2 2
4 2 2
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