Sinee A90 Series, Руководство пользователя

Страница: 279 / 300

User Manual of A90 Series Inverter
279
The main diagnosis function used by our company is line diagnosis (0000), which
is used to test the normal communication between the host and slave. The normal
response to a request to return query data is to return the same data. At the same time, the
function codes and sub-function codes are also copied.

Request PDU
Function code 1 byte 0x08
Sub-function code 2 bytes 0x0000 - 0xFFFF
Data 2 bytes 0x0000 - 0xFFFF

Response PDU
Function code 1 byte 0x08
Sub-function code 2 bytes 0x0000 - 0xFFFF
Data 2 bytes 0x0000 - 0xFFFF

Error PDU
Error code 1 byte 0x88
Exception code 1 byte See Table 0-4

Sub-function code
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 00