Hitachi SJ200 Series

Network Protocol Reference
Appendix B
B–14
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).
The test subcode is for echo (00h,00h) only and not available to the other commands.
Query:
Note 1: Broadcasting is disabled.
Response:
No. Field Name
Example
(Hex)
1 Slave address *1 01
2 Function code 08
3 Test subcode
(high order)
00
4 Test subcode
(low order)
00
5Data
(high order)
Any
6Data
(low order)
Any
7 CRC-16 (high order) CRC
8 CRC-16 (low order) CRC
No. Field Name
Example
(Hex)
1 Slave address 01
2 Function code 08
3 Test subcode
(high order)
00
4 Test subcode
(low order)
00
5Data
(high order)
Any
6Data
(low order)
Any
7 CRC-16 (high order) CRC
8 CRC-16 (low order) CRC