ProSoft Technology 5201-MNET-101S - Manual (Page 80)

Reference IEC-101 Slave ♦ ProLinx Communication Gateway
Protocol Manual IEC 60870-5-101 v3 Slave (Firmware version 3.xx)
Page 80 of 159 ProSoft Technology, Inc.
August 6, 2010
5.2.3 Monitor Direction and Control Direction
The protocol specification defines two directions of data: monitor direction and
control direction.

Monitor Direction: The direction of transmission from a slave to the Master
 Control Direction: The direction of transmission from the Master to the slave
The points that are typically transferred from the slave to the Master are also
known as Monitor Points (or Monitor Information Objects). The points that are
typically transferred from the Master to the slave are also known as Control
Points (or Command Information Objects).
The following illustration describes the data transfer for control and monitor
points between the 101S and the Master.
You must configure all points in the correct location in the 101S gateway
database, so that they can be updated properly from the Master.