Energy Meter Manual

5-12
<Toc> <Ind> <5. Modbus/RTU and ASCII Communication Protocols>
IM 77C01E01-10E
06 Writes data into D register
● Function
This function code writes data into a specified D registers number.
• The maximum number of D registers to be written into at a time is 1.
• For the format of response in the event of failure, see subsection 5.1.4.
• Broadcast addressing is possible (by setting “00” to the station number).
● Message (for normal operation)
Element
Number of bytes
in RTU mode
Number of bytes
in ASCII mode
1
Write Data
(Upper Digit)
2
Start of
Message
Mark (:)
None
1
Write Data
(Lower Digit)
1
2
Error
Check
2
2
Station
Number
(ST-NO)
1
2
None
End of Message Mark
(CR + LF)
2
Function Code
(06)
1
2
D-Register
Number
(Upper Digit)
1
22
1
D-Register
Number
(Lower Digit)
Message (continued)
● Response (for normal operation)
Element
Number of bytes
in RTU mode
Number of bytes
in ASCII mode
1
Write Data
(Upper Digit)
2
Start of
Message
Mark (:)
None
1
Write Data
(Lower Digit)
1
2
Error
Check
2
2
Station
Number
(ST-NO)
1
2
None
End of Message Mark
(CR + LF)
2
Function Code
(06)
1
2
D-Register
Number
(Upper Digit)
1
22
1
D-Register
Number
(Lower Digit)
Response (continued)
● Example (ASCII mode)
Write 0001 into the D0302 (optional integration start/stop) at station number 11.
[Message] [:]0B06012D0001C0[CR][LF]
“0B”: station number 11, “06”: function code 06, “012D”: D register number 302, “0001”:
data 0001, and “C0”: error check
* Numbers in quotation marks are hexadecimal.
The following response will be returned to the message above.
[Response] [:]0B06012D0001C0[CR][LF]
The frame same as the message is returned.