Does Applied Systems Engineering (ASE) provide protocol documentation for the SPT4-NET protocol support I purchase?
In general, no. Due to copyright restrictions ASE is prohibited from distributing protocol specification documentation. The best option is to contact the RTU or IED manufacturer and request documentation for the specific protocol. Also, if it is a standards based protocol such as DNP 3, Modbus, or IEC, you can obtain documentation from the organization managing the protocol.