All configuration is done via a single-device SPI bus. The interface is kept similar to the LTC2600 to use the same SPI master code.
Note that up to 16 commands can be sent to a board with one trbnet access: Load all commands to registers 0xd400 - 0xd40f, set the correct amount in 0xd411 plus Bit 7 to select the multi-write mode.