ProSoft Technology 5201-DFNT-104S - Manual (Page 47)

IEC-60870-5-104 (104S) Protocol Implementation 104S v2 ♦ ProLinx Gateway
Protocol Manual (Firmware v2.xx)
ProSoft Technology, Inc.
Page 47 of 157
3.2 Monitor Direction and Control Direction: Point Definition
The protocol specification defines two directions of data: monitor direction and
control direction.
Monitor Direction: The direction of transmission from a server to a Client
Control Direction: The direction of transmission from a Client to a server
The points that are typically transferred from a server to a Client are also known
as Monitor Points (or Monitor Information Objects). The points that are typically
transferred from a Client to a server are also known as Control Points (or
Command Information Objects).
The 104S v2 contains an internal database of 4000, 16-bit words. You must
associate the monitor and control points to database addresses in the 104S v2.
To configure the points for the 104S v2, follow these steps:
1 Calculate the number of monitor and control points for the application.
2 Calculate the 104S v2 database regions that are required for the application,
based on the number of monitor and control points. Define two separate
regions. Remember that each data type stores a different quantity of data (for
example, M_SP_NA uses one bit, M_ST_NA uses one byte, and so on).
3 Configure each point within its 104S v2 database region.
March 19, 2010