U-229 connectorMost devices that support the 'sor protocol, use thesame 5-pin or 6-pin AUDIO connector, commonly referred to as U-229/Uor simply U-229.It has a,but is different for each protocol. Click theimage below for more information.
This article provides insufficient context for those unfamiliar with the subject. ( January 2011) IEC 60870 part 5 is one of the set of standards which define systems used for telecontrol in and applications. Part 5 provides a communication profile for sending basic telecontrol messages between two systems, which uses permanent directly connected data circuits between the systems.