Page 10 DTRX1 9941
Termination resistance activated
In this case, JP2 in position A (charge
on) since the receiver is at one of the
ends of line L1.
As it is also the generator of line L2, (and
thus also one of its ends), JP1 is in
position A (termination resistance
enabled).
Termination resistance deactivated
The receiver is not located at one end of
the line L1, therefore the jumper JP2
must be in position B (termination
resistance deactivated).
The position of jumper JP1 is not
important.
Lines of communication set in RS485: connections types
The RS485 connection can be of the following types:
lines of communication
advantages
disadvantages
•
point-point
The lines of input and output
of each receiver are
separate.
The maximum distance
between pairs of directly
connected receivers is 1200
metres.
The malfunctioning of one receiver
causes all the receivers connected in
sequence to it to stop.
•
multi-point
A single line of
communication serves all the
receivers.
If one receiver stops, it does
not affect the operation of the
others.
The maximum length of the line (from
end to end) is 1200 metres.
•
mixed
This is a combination of those above, and depending on the combination chosen, allows you to make
the most of the advantages, considerably reducing the possibility of a malfunction.
Here is an example of the three types of connection:
Point-point connection
Each one of the lines, L1, L2 and L3 is
independent.
Each line must terminate at the terminals (wave
symbol in the figure) to respect the specifications
of the RS485 standard.
The maximum distance between keyboard K1 and
receiver R3 is 3600 metres (3 lines x 1200 mm
max. each).
Summary of Contents for DTRX1
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