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# Commands
This page contains the valid commands that can be sent and how they are formatted.
Given we use I2C for comms using hex as the commands are reasonable.
## Categories
The commands are divided into the following categories, with their own upper byte.
The "#" denotes that this is dependent upon the command.
| hex | category |
| :- | :- |
| 0x1# | Read data |
| 0x2# | Write data |
## Complete command table
| command | description | note |
| :-- | :-- | :-- |
| 0x11 | Read config | |
| 0x12 | Read internal voltage | |
| 0x13 | Read external voltage | |
| 0x14 | Read temperature | |
| 0x15 | Read current fan speed | |
| 0x16 | Read bulk fan speed | |
| 0x21 | Write config | |
| 0x22 | Clear stored fan speed data | |