B–14, Appendix b – Hitachi L2002 User Manual
Page 250
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
5
Data
(high order)
Any
6
Data
(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
5
Data
(high order)
Any
6
Data
(low order)
Any
7
CRC-16 (high order)
CRC
8
CRC-16 (low order)
CRC