====== 3.5 CMD_WRITE ======

This command writes a parameter with the index and subindex as given on the addressed port.

**Command:**

^ Octet # ^ Usage ^
| 0 | Command ID = 0x05 |
| 1 | Port index 0x00 or 0x01 |
| 2..3 | Index, 16-bit value |
| 4 | Subindex |
| 5 | Length |
| 6.. | Write Data |

The structure of the //**Write Data**// can be found in the SDCI device’s documentation.

**Return Success:**

^ Octet # ^ Usage ^
| 0 | Command ID = 0x05 |
| 1 | Port index 0x00 or 0x01 |
| 2..3 | Index, 16-bit value |
| 4 | Subindex |
| 5 | Length (as given in the command) |

To verify the write operation, a [[iol_hat:sw:3_binary-protocol:3.4_cmd-read|read operation]] (Command ID 0x04) can be used on the same //**Index **//and //**Subindex**//.