This function is called from YOUR application code to perform a diagnostic check on a Modbus slave.
Prototype
CPU_INT16U MBM_FC08_Diag (MODBUS_CH *pch,
CPU_INT08U slave_node,
CPU_INT16U fnct,
CPU_INT16U sub_fnct,
CPU_INT16U *pval);Arguments
pch
is a pointer to the channel (returned by MB_CfgCh()). This pointer specifies onto which channel the Modbus master will be communicating on. Of course, ‘pch’ must have been configured as a Master when you configured the channel.
...
corresponds to a sub-function argument for the function. At this time, µC/Modbus does not support sub-functions.
Returned Value
MODBUS_ERR_NONE
if the call was successful.
...
If you specified an invalid sub-function.
Notes / Warnings
None
Called By
Your Modbus master application.