Motorola 68P02958C00-B - Manual (Page 18)

Introduction
1-3
A system with multiple vendors SCADA control center is shown in Figure 1-2. The MDLC
communicates with any SCADA computer which supports the TCP/IP network (UNIX, VMS,
Windows/NT, Windows/95, OS/2 etc.).
RTU
RTU
RTU
MDLC over Radio
NFM Central MOSCAD
ToolBox
(over IP)
Ethernet
IP Gateway
IP Network
MDLC over IP
RTU
TCP/IP
MDLC over R 485 S
Ethernet
Figure 1-2: IP Gateway with Multiple Vendors SCADA Control Center
The SCADA control center, which includes workstations and a SCADA computer, exchanges
data with the MOSCAD system via the IP Gateway, which serves as a Gateway from the
TCP/IP world to the MDLC world. There are many SCADA packages which already have the
Gateway Interface driver implemented, some as direct access to the IP Gateway, and some as
OPC server.
IP Gateway Applications
The IP Gateway uses the TCP/IP LAN Protocol for exchanging data application messages with
the SCADA software. The IP Gateway API (Application Programming Interface) source
library allows SCADA developers to quickly and easily connect to the MOSCAD world. The
IP Gateway API, which is part of the IP Gateway product line, allows SCADA driver
developers to quickly and easily build the IP Gateway Interface (driver), which serves as a
communication interface with the MOSCAD world.
Data exchange between the SCADA (client) and the IP Gateway (server) is carried out using
"peer -to-peer" communication over the LAN. The IP Gateway can support multiple
connections that are initiated from multiple SCADA computers.
The implementation of the IP Gateway interface in the SCADA software allows the SCADA
to perform the following:
• Poll a MOSCAD RTU in order to get data and COS (Change-of-State) events from the
RTU tables.