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:

 

 

 

Response:

 

 

 

 

 

 

 

 

 

 

 

 

No.

Field Name

Example

 

No.

Field Name

Example

 

 

(Hex)

 

(Hex)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Slave address *1

01

 

1

Slave address

01

 

 

 

 

 

 

 

 

 

B

 

2

Function code

08

 

2

Function code

08

 

 

 

 

 

 

 

 

Appendix

 

3

Test subcode

00

 

3

Test subcode

00

 

 

 

 

 

 

(high order)

 

 

 

(high order)

 

 

 

 

 

 

 

 

 

 

 

 

4

Test subcode

00

 

4

Test subcode

00

 

 

 

(low order)

 

 

 

(low order)

 

 

 

 

 

 

 

 

 

 

 

 

5

Data

Any

 

5

Data

Any

 

 

 

(high order)

 

 

 

(high order)

 

 

 

 

 

 

 

 

 

 

 

 

6

Data

Any

 

6

Data

Any

 

 

 

(low order)

 

 

 

(low order)

 

 

 

 

 

 

 

 

 

 

 

 

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.

The test subcode is for echo (00h,00h) only and not available to the other commands.