User Manual of EM730/EM730E Series Inverter
325
Sub-fun
ction
Meaning
Data field
(request)
Data field
(response)
0000
Return query
data
Any
Copy request
data
…
0000
: return the data transferred in the request data field in the response. All messages
should be consistent with the request message.
The following table is an example of requesting the remote terminal unit to return query
data. The sub-function code 0000 is used. The returned data is sent in the two-byte data field
(0xA537).
Request
Respond
Domain name
(0x)
Domain
name
(normal)
(0x)
Domain name
(abnormal)
(0x)
Function
08
Function
08
Function
88
Sub-function code Hi
00
Sub-function
code Hi
00
Exception
code
03
Sub-function code Lo
00
Sub-function
code Lo
00
Data Hi
A5
Data Hi
A5
Data Lo
37
Data Lo
37
1.1.1.5
0x06: function code used to write a single register or command
In the remote terminal unit, this function code is used to write a single holding register.
The request PDU describes the address to be written to the register.
The normal response is the response made to the request, which is returned after the
register content is written.
Request PDU
Function code
1 byte
0x06
Address of register
2 bytes
0x0000 - 0xFFFF
Register value
2 bytes
0x0000 - 0xFFFF
Response PDU
Function code
1 byte
0x06
Address of
register
2 bytes
0x0000 - 0xFFFF
Register value
2 bytes
0x0000 - 0xFFFF
