To enable multiplexing, navigate to Expanders | Reader Expanders and select the Onboard Reader
Select (enable) Multiple Reader Input Port 1 to enable multiplexing for the first door allowing dual readers to be connected for entry and exit processing.
Select (enable) Multiple Reader Input Port 2 to enable multiplexing for the second door allowing dual readers to be connected for entry and exit processing.
The duplex reader that is connected will always operate as the exit reader.