For the specification of the SPA protocol V2.5, refer to SPA-bus Communication Protocol V2.5.15.4.2 Setting guidelines M11876-3 v4.1.1The setting parameters for the SPA communication are set via the local HMI.SPA, IEC 60870-5-103 and DNP3 uses the same rear communication port. Set the parameterOperation, under Main menu /Configuration /Communication /SLM configuration /Rearoptical SPA-IEC-DNP port /Protocol selection to the selected protocol.When the communication protocols have been selected, the IED is automatically restarted.The most important settings in the IED for SPA communication are the slave number and baudrate (communication speed). These settings are absolutely essential for all communicationcontact to the IED.These settings can only be done on the local HMI for rear channel communication and for frontchannel communication.The slave number can be set to any value from 1 to 899, as long as the slave number is uniquewithin the used SPA loop.The baud rate, which is the communication speed, can be set to between 300 and 38400 baud.Refer to technical data to determine the rated communication speed for the selectedcommunication interfaces. The baud rate should be the same for the whole station, althoughdifferent baud rates in a loop are possible. If different baud rates in the same fiber optical loopor RS485 network are used, consider this when making the communication setup in thecommunication master, the PC.For local fiber optic communication, 19200 or 38400 baud is the normal setting. If telephonecommunication is used, the communication speed depends on the quality of the connectionand on the type of modem used. But remember that the IED does not adapt its speed to theactual communication conditions, because the speed is set on the local HMI.1MRK 504 158-UEN A Section 15Station communication235Application manual
