# RelayChannel

## class RelayChannel( *, physical_channel: str, alias: str, direction: Direction, )[source]

Bases: [`DAQChannel`](https://dev.nominal.io/instro/ref/instruments/instro.daq.types.DAQChannel.md#instro.daq.types.DAQChannel "instro.daq.types.DAQChannel")

A relay channel routed via open/close. `direction` is always `OUTPUT` (relay control is a command).

### physical_channel: str

### alias: str

### direction: Direction