DNP3 IDS Signatures 
DNP3 is a very simple client server protocol that was originally designed for very low speed serial communication in process control networks. DNP3 is most commonly used in electric utilities, but there is nothing specific to the electric industry in the protocol. The client, also referred to as the master, is typically a HMI or control server that issues DNP3 requests to a PLC, RTU, or other field device acting as a DNP3 server, also called the slave. Common request types include read requests, write requests, starting and stopping applications, freezing values to buffers, and a variety of administrative and diagnostic requests.
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