The solution comes as two separate downloads
SC Excel DTC AddIn - real time quote and trade updates, data comes from DTC and does not rely on a chart
SC Excel Cht AddIn - real time + historical data, data comes from a chart and is bar based
See below for more detail.
SC Excel DTC AddIn
The DTC AddIn supports real time streaming from SC to Excel. The AddIn utilizes the DTC protocol and requires that SC be setup as a DTC server.
For more details on the DTC AddIn, see here: SC Excel Dtc AddIn
SC Excel Cht AddIn
Use this AddIn to access data that is chart based. Some examples include OHLC, subgraphs and volume. This AddIn requires a chart to be open with the relevant bar periods and studies applied. In general, any subgraph can be exported to exported to Excel.
For more detail, see here: SierraChart SC-Excel Cht AddIn