10/05 AWB8230-1541GB
The network protocol
157
Loopback [08
hex
]
This function tests the transfer between master and slave
(response loop).
Example:
Sending any test data (request) to the frequency inverter with
slave address 1 and return of this data (response) for the loopback
test.
If the data written to the selected coil contains errors, an exception
message is issued (a page 160).
The test control bit (00
hex
, 00
hex
) can be used only for echoing; it
is not available for other commands.
Request: Answer:
No. Name Exampl
e
No. Name Exampl
e
hex hex
1 Slave address (broadcast disabled) 01 1 Slave address 0A
2 Function code 08 2 Function code 05
3 Test control bit (High byte) 00 3 Test control bit (High byte) 00
4 Test control bit (Low byte) 00 4 Test control bit (Low byte) 00
5 Data (High byte) Any 5 Data (High byte) Any
6 Data (Low byte) Any 6 Data (Low byte) Any
7
CRC-16 (High byte) CRC 7 CRC-16 (High byte) CRC
8 CRC-16 (Low byte) CRC 8 CRC-16 (Low byte) CRC
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