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Loopback Test [08h]:
This function checks a master-slave transmission using any test data. An example
follows:
• Send test data to an inverter having slave address “1” and receiving the test data
from the inverter (as a loopback test).
Query: Response:
No. Field Name
Example
(Hex)
No. Field Name
Example
(Hex)
1 Slave address *1 01 1 Slave address *1 01
2 Function code 08 2 Function code 08
3 Test subcode
(high order)
00 3 Test subcode
(high order)
00
4 Test subcode
(low order)
00 4 Test subcode
(low order)
00
5 Data (high order) Any 5 Data (high order) Any
6 Data (low order) Any 6 Data (low order) Any
7 CRC-16 (high order) CRC 7 CRC-16 (high order) CRC
8 CRC-16 (low order) CRC 8 CRC-16 (low order) CRC
Note 1: Broadcasting is disabled.
When test subcode is for echo (00h, 00h) only and not available to the other commands.
B−14
Appendix B