# TMCM-1111 fraction collector

Flowchem supports the Analog Devices / TRINAMIC TMCM-1111 StepRocker as a single-axis linear fraction collector over
the USB virtual serial port.

Positions are configured in raw TMCM microsteps. Calibrate these values on the real rail and use names such as
`waste`, `vial_1`, or `vial_2` in experiment scripts.

## Configuration

```toml
[device.fraction_collector]
type = "TMCM1111"
port = "COM7"
positions = { waste = 0, vial_1 = 12000, vial_2 = 24000 }
home_position = "waste"
home_on_initialize = false
```

The serial connection follows the same pattern as other Flowchem serial devices. `port` is required; the following
serial settings are optional and default to the TMCM-1111 USB serial defaults:

```toml
baudrate = 9600
timeout = 1
bytesize = 8
parity = "N"
stopbits = 1
```

Reference-search settings can be provided when homing should be controlled from Flowchem:

```toml
reference_search_mode = 1
reference_search_speed = 51200
reference_switch_speed = 4096
```

## API

The `fraction-collector` component provides:

* `PUT /position?position=vial_1`
* `GET /position`
* `GET /available_positions`
* `PUT /home`
* `PUT /stop`
* `GET /limits`
* `GET /target-reached`