Omron MX2 Series - Loop-Back Test [08 Hex]

8 Communications Functions
8 - 15
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
⚫ Response
No.
Field name
Example
[hex]
1
Slave address
*1
01
2
Function code
06
3
Register address (MSB)
*2
00
4
Register address (LSB)
*2
01
5
Written data (MSB)
13
6
Written data (LSB)
88
7
CRC-16 (MSB)
D5
8
CRC-16 (LSB)
5C
*1. For a broadcast, no response will be sent back.
*2. Note that the holding register start address for F001(LOW) is 0001 hex, which is 1 less than the register num-
ber 0002 hex: Register address = Register number - 1.
Note that, except for F001, changing the parameter value on the data display does not update the dis-
played data realtime. To view the updated value, once return to the parameter display and then display
the data again.
If the Write to Holding Register function is not executed normally, refer to 8-5-9 Exception Response on
page 8-20.
8-5-5 Loop-back Test [08 hex]
Checks the communications between the master and the slave. Any value can be used for test data.
⚫ Query
No.
Field name
Example
[hex]
1
Slave address
*1
01
2
Function code
08
3
Test sub code (MSB)
00
4
Test sub code (LSB)
00
5
Data (MSB)
Any
6
Data (LSB)
Any
7
CRC-16 (MSB)
CRC
8
CRC-16 (LSB)
CRC
8
8-5 Explanation of Each Function Code
8-5-5 Loop-back Test [08 hex]
Example. Perform a Loop-back Test on Inverter with Slave Address 1