Multi-function tool to configure and access non-standard Modbus features of the SeaI/O module.
- Deprecated:
- Version 2.x
- Parameters
-
| [in] | slave_id | Slave ID of the module |
| [in] | which | IOCTL function to perform |
| [in,out] | data | Appropriate data structure (depending on IOCTL function) |
- Return values
-
| >=0 | Success. |
| -22 | A null pointer has been supplied where a pointer to a data buffer was expected. |
| (*) | Also valid are return values for CSeaMaxW32::Read() and CSeaMaxW32::Write(). |
Ioctl has been provided as a multi-function tool to configure and access non-standard Modbus features of the SeaI/O module.
The actual Modbus transaction is specified by the 'which' argument. Ioctl can be used to set module parameters, configure state, and access data. Consult the provided example source for model specific information.
The final parameter, data, is a pointer to a datatype which is appropriate for the particular IOCTL call.
- Note
- The following are deviations from SeaMAX v2:
- An invalid IOCTL will return -1.
- For IOCTL_READ_COMM_PARAM, the ioctl_struct will not be populated with a magic cookie value.
References SM_GetADDAConfig(), SM_GetADDAExtendedConfig(), SM_GetDeviceConfig(), SM_GetPIODirection(), SM_SelectDevice(), SM_SetADDAConfig(), SM_SetCommunications(), SM_SetPIODirection(), and SM_SetSoftwareAddress().
