ProSoft Technology PTQ-101M - Manual (Page 140)

PTQ-101M ♦ Quantum Platform Reference
IEC 60870-5-101 Master Communication Module
Page 140 of 181 ProSoft Technology, Inc.
May 14, 2008
7.2.4 Master Driver
The master driver supported on each application port of the module emulates an
IEC 60870-5-101 master device. Configuration of each port is independent and
should be connected to different serial networks.
Each port on the module communicates with one or more controlled stations on
what are referred to as sessions. A session represents a controlled device with a
unique data link layer address. Each session (controlled device) contains one or
more data sets (sectors) that are defined by the vendor of the device. The
following illustration shows these relationships.
Port 0 on the module communicates with 4 sessions (0, 1, 3 and 4) each of which
has their own data set(s). Session 1 only has one sector (all data for device
contained in a single database). This sector is addressed by the master using the
Common address of ASDU value set for the sector in the configuration file.
Session 0 contains two sectors each with their own unique Common address of
ASDU value to identify the sector. Port 0 must operate in unbalanced mode as
more than one device exists on the network.
Port 1 may operate in balanced mode as it only contains one device on the
network. This device is defined in the Session 2 section of the configuration file.
In this example, all data of the device is stored in a single sector.
The module supports two application ports. Thirty-two session can be defined on
the module with each session being assigned to an application port. Within each
session, up to five sectors can be defined. This system permits a very flexible
assignment of resources in the module. The definition of the data associated with
each sector in the system is defined by the user in the configuration file.