Hitachi SJ Series User Manual page 506

Chapter 14
14.4.5 Loopback test [08h]
• Use this test for a communication check between the
master and slaves. For test data, arbitrary values can be
used.
(Example)
To perform a loopback test on the inverter with slave
address 1.
Query
Field Name
1 Slave address *1)
2 Function code
3 Diagnostic sub code (high)
4 Diagnostic sub code (low)
5 Data (high)
6 Data (low)
7 CRC-16 (high)
8 CRC-16 (low)
!
*1) A broadcasting cannot be executed.
A
• Diagnostic sub codes correspond to query data echo
(00h, 00h) only and not to other commands.
Response
Example (HEX)
01
08
00
00
Arbitrary
Arbitrary
CRC
CRC
14-15
RS485 Communication
Field Name
1 Slave address
2 Function code
3 Diagnostic sub code (high)
4 Diagnostic sub code (low)
5 Data (high)
6 Data (low)
7 CRC-16 (high)
8 CRC-16 (low)
Example (HEX)
01
08
00
00
Arbitrary
Arbitrary
CRC
CRC