The Remote Down led is off. Why won't the MultiMuxes pass data?

Source and Destination node numbers may not be configured properly when communicating with MM or MMH/V 16 and 32 series MultiMuxes. Each MultiMux needs to be assigned a unique Source Node number. When you configure the channels, each channel's Destination Node Number field must be configured with the Node number of the destination MultiMux. MM900 or MMH900 series MultiMux should be assigned node numbers 98 or 99.