Most of the DLN adapters support the SPI master interface. Some of them have several independent SPI master ports.
Before transmitting data, you need to configure the SPI master ports according to the slave requirements and enable it (See Configuring the SPI Master Interface).
You can either transmit data in full-duplex or in half-duplex mode (See SPI Data Transmission).
If you need to work with multi slave devices, you can interconnect them following the instructions in Connecting Multiple Slave Devices.