ABB REG670 Applications Manual page 708

Section 20
Station communication
702
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.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
1MRK 502 071-UEN -
Application manual