The channel to operate on. Valid options are rx/RF 0, rx/RF 1, tx/RF 0, and tx/RF 1. For this node, scope is used to determine which daughterboard to update the ATR state of.
The specific ATR register to write to. The registers correspond to the four states each daughterboard supports. The daughterboard state is set based on whether Rx and Tx are enabled or disabled, using the Enable Front End node. It is safe to call the Enable Front End node after writing to the ATR registers.