AEG DUA2.1, Technical Manual And User Manual

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Handling, Installation and Case Dimensions
7. Communication
7.1 RS232 Port
In the bottom of the front panel, there is a RS232 port, The communication with
a computer through the RS232 allows access to the relay all information and
setting. It makes the access and changes of any information, setting and
configuration.
You can see all events and records by this port on monitor of computer we will
explain it by details in the next sections.
7.2 RS485 port
Connections to RS485 are made using annular terminals. It is recommended that
a two core screened cable, is used with a maximum total length of 1000 m or
a200nF total cable capacitance.
Typical specification:
−
Each core: 16/0.2 mm copper conductor, PVC insulated.
−
Nominal conductor area: 0.5 mm² per core
−
Screen: Overall braid, PVC sheathed
−
Linear capacitance between conductor and earth: 100pF/m
8. Earthing
Each equipment must be connected to a local earth terminal by the intermediary
of a M4 earth terminal. We recommend a wire of minimal section of 2.5 mm², with
annular terminals on the side of the equipment. Because of the limitations of the
annular terminals, the possible maximum section is of 6mm² by wire. If a larger
section is necessary, one can use cables connected in parallel, each one ending
with an annular terminal separated on the side of the equipment. One can also
use a metal bar.
NOTE: To prevent any electrolytic risk between copper conductor or brass
conductor and the back plate of the equipment, it is necessary to take
precautions to isolate them one from the other. This can be done in several
ways, for example by inserting between the conductor and the case a plated
nickel or insulated ring washer or by using a tin terminals.
HF9024