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1MRS750881-MUM
6.
6.1.
Remote Monitoring and Control Unit
Technical Reference Manual
Communication
General
The REC 523 supports the most common remote communication protocols, such as:
• IEC 60870-5-101
• DNP 3.0
• Modbus
By using open and standard protocols in the REC 523 units, it is possible to connect
to various SCADA systems.
The REC 523 has a default protocol interface that fits to modern SCADA systems
as such. However, in case the existing SCADA system is inadaptable you can
modify the protocol interface by using the Protocol Editing Tool. For IEC 60870-5-
101 protocol, the REC 523 revision F provides support for the Protocol Mapping
Tool (PMT). The Protocol Editing Tool and the Protocol Mapping Tool are included
in CAP 505.
The REC 523 is also able to communicate with a modem by using freely
programmable AT-Hayes commands. This function enables a sophisticated dial-up
and re-dialling system, watchdog function and even entering the PIN code for
cellular telephone modems.
The REC 523 has one RS 485 and two RS 232 serial communication ports.The
9-pole RS 485 connection X5.3 connects the REC 523 units to the distribution
automation system via a SPA bus or a LON bus, LON being the default mode. The
RS 232 port (X5.1) is used for the remote communication protocol, whereas the
second RS 232 port (X5.2) is used for parametrization using the SPA bus protocol.
Note that a special parametrization cable of type 1MRS120520 is required to enter
the SPA bus mode in port X5.2.
The fibre-optic interface module type RER 103 is used to connect the REC unit to
the fibre-optic communication bus. This module supports both SPA-bus and LON-
bus communication. To connect REC 523 to the free topology network, the free
topology network interface (FTT-10) module should be used.
For communication port locations, refer to Fig. 7.2.-1, Fig. 7.2.-2 and Fig. 7.2.-3.
Note that the use of serial communication ports is not the same in
different revisions of REC 523 (refer to Chapter 11. Revision history
of REC 523).
REC 523
49
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