Modbus TCP IDS Signatures 
Modbus is a very simple client server protocol that was originally designed for very low speed serial communication in process control networks. Modbus is used across many of the critical infrastructure industries including water, oil and gas, and manufacturing. The client is typically a HMI or control server that issues Modbus requests to a PLC, RTU, or other field device acting as a Modbus server. Common request types include read requests, write requests, and diagnostics.
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