Advantech DVP-7020BE User Manual page 30

1.10.2 Switch Channels
Set the "Switch Channels" to decide how many input for each
878A video chip. Each 878A chip can switch to 4 channel video
inputs to share 30/25 frame per second. For more information,
please refer to "Chapter 2.5.17 AdvDVP_SetVideoInput".
30 DVP-7020BE User's Manual