Reading ADC MCP3914 with RaspberryP using Simulink blocks.

I am reading successfully MCP 3914 ADC chip with 8 ADC X 24 bits (3x 8 unit) trough a Simulink read block. I can display the 24 bytes on display block.The first 3 bytes represent channel 1 the next 3 channel 2 etc.. What block or function block do I use to store these 24 bytes into a memory array over n samples .