# OpenSerialStreamRequest - Source proto: `rb/api/serial.proto` Request to open serial stream. | Field | Type | Label | Description | | ----- | ---- | ----- | ----------- | | request_header | [RequestHeader](../header/requestheader.md#rb-api-requestheader) | | | | connect | [SerialOpenRequest](serialopenrequest.md#rb-api-serialopenrequest) | | | | write | [SerialWriteRequest](serialwriterequest.md#rb-api-serialwriterequest) | | |