Larger sensor arrays can be created using the multi-cast channel option. Very low overhead, single message, single response communication is used. For more sophisticated apps, shared channels use a unique address in the first two bytes of the data packet. This option makes it possible for an ANT Engine to support multiple nodes on a multi-cast channel, in addition to maintaining standard channels on its other available connections. The polling process suits non-critical data collection. The MCU application is responsible for setting the polling order.