DNP3 communications
DNP3 Distributed Network Protocol is a set of communications protocols used between components in process automation systems. Its main use is in utilities such as electric and water companies. is designed to optimize transmission of data and control commands from a master computer to one or more remote devices or outstations. The data logger allows DNP3 communications on all available communications ports. CRBasic DNP3 instructions include:
DNP()DNPUpdate()DNPVariable()
See the CRBasic Editor help for detailed instruction information and program examples: 
When DNPUpdate() is used to set up the data logger as a remote (slave) device, up to three DNP3 clients (masters) are supported.
For additional information on DNP3 see: