2.16 Details on Protocols
MEMOBUS Protocol
2-407
Performing a Loopback Test
Changing the States of Multiple Coils
7•••••••••0
(H)
(L)
(H)
(L)
CRC-16
(H)
(L)
Command
Slave address
Function code: 08 hex
Test code
Data
The function code to perform a loopback test is 08 hex.
Set the test code.
Set the data for the test.
Error checking
7•••••••••0
(H)
(L)
(H)
(L)
CRC-16
(H)
(L)
Response
Slave address
Function code: 08 hex
Test code
Data
The function code to perform a loopback test is 08 hex.
This will contain the same value in the command if the test ends successfully.
This will contain the same value in the command if the test ends successfully.
Error checking
CRC-16
(H)
(L)
7•••••••••0
(H)
(L)
(H)
(L)
Command
Slave address
Function code: 0F hex
First address
Number of coils
Number of data items
States of first 8 coils
States of next 8 coils
States of next 8 coils
The function code to change the states of coils is 0F hex.
Set the first address of the coil to change.
Set the number of coils to change.
Set the byte length of data to write.
Set the state to change the coil to.
Error checking
7•••••••••0
(H)
(L)
(H)
(L)
CRC-16
(H)
(L)
Response
Slave address
Function code: 0F hex
First address
Number of coils
The function code to change the states of coils is 0F hex.
This contains the first address of the changed coils.
This contains the number of changed coils.
Error checking
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