Performs a Modbus write on an opened SeaI/O module and returns the data by reference.
- Deprecated:
- Version 2.x
- Parameters
-
| [in] | slave_id | Slave ID of the target module |
| [in] | type | Type of read to complete |
| [in] | starting_address | Address to begin reading |
| [in] | range | Number of I/O points to read |
| [out] | data | Data pointer |
- Return values
-
| >=0 | Success - the number of valid data bytes in the buffer. |
| -14 | A Modbus read exception has occured - the first byte of the data buffer contains the exception. |
| -22 | A null pointer has been supplied where a pointer to a data buffer was expected. |
| -9 | The specified communication is not current established. |
| -18 | Can not write data to the outbound connection - connection error. |
| -19 | The SeaI/O module did not respond. |
| -34 | Attempting to write to more IO points than are available. |
| -27 | Illegal data value. |
Write performs a Modbus write on an opened SeaI/O module and returns the data by reference.
The actual Modbus write type is specified by the 'type' argument. Since Modbus is actually base one, the starting location should be no less than one. Likewise, the range indicates how many consecutive inputs should be read.
The final parameter, 'data', is a pointer to a buffer in which to store the returned data - specifically, an array of bytes. Consult the provided code examples for model specific information.
References SM_GlobalCommsReset(), SM_ReadInputRegisters(), SM_SelectDevice(), SM_WriteCoils(), SM_WriteHoldingRegisters(), and SM_WritePIO().
