ABB RET650 Applications Manual page 333

1MRK 504 169-UEN A
Transformer protection RET650 2.2 IEC
Application manual
The most important SPA communication setting parameters are SlaveAddress and
BaudRate. They are essential for all communication contact to the IED.
SlaveAddress and BaudRate can be set only on the local HMI for rear and front
channel communication.
SlaveAddress can be set to any value between 1–899 as long as the slave number is
unique within the used SPA loop. BaudRate (communication speed) can be set
between 300–38400 baud. BaudRate should be the same for the whole station
although different communication speeds in a loop are possible. If different
communication speeds are used in the same fibre optical loop or RS485 network,
take this into account when making the communication setup in the communication
master (the PC).
With local fibre optic communication, communication speed is usually set to 19200
or 38400 baud. With telephone communication, the speed setting depends on the
quality of the connection and the type of modem used. Refer to technical data to
determine the rated communication speed for the selected communication
interfaces.
The IED does not adapt its speed to the actual communication
conditions because the communication speed is set on the local
HMI.
Section 16
Station communication
327