Hitachi SJ2002 Series Instruction Manual page 252

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