====== 3.4 CMD_READ ======

This command reads a parameter with the index and subindex as given on the corresponding port.

**Command:**

^ Octet # ^ Usage ^
| 0 | Command ID = 0x04 |
| 1 | Port index 0x00 or 0x01 |
| 2..3 | Index, 16-bit value |
| 4 | Subindex |
| 5 | Length |

The //**Length **//field is the desired/maximum length for the attribute. The structure of the attribute can be found in the SDCI device’s documentation.

**Return Success:**

^ Octet # ^ Usage ^
| 0 | Command ID = 0x04 |
| 1 | Port index 0x00 or 0x01 |
| 2..3 | Index, 16-bit value |
| 4 | Subindex |
| 5 | Read Length |
| 6.. | Read Data |

The structure for the Read Data can be found in the SDCI device’s documentation.