Methods and apparatus to implement a remote terminal unit network are disclosed. An example method involves allocating, via a processor of a first remote terminal unit, a first time slot of a first frame of a first transmission schedule to the first remote terminal unit, the first remote terminal unit to be in communication with a second remote terminal unit in a network associated with a process control system and to be in communication with a host of the process control system, the first remote terminal unit to communicate first data over the network during the first time slot, and allocating, via the processor, a second time slot of the first frame to the second remote terminal unit, the second remote terminal unit to communicate second data over the network during the second time slot.