User's Manual

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FR 13053 108 B
12/27
CE DOCUMENT EST LA PROPRIÉTÉ DE BALOGH IL NE PEUT ETRE COMMUNIQUÉ À DES TIERS SANS AUTORISATION ECRTITE PRÉALABLE.
THIS DOCUMENT IS BALOGH PROPERTY.IT CANNOT BE DISCLOSED TO ANY PARTY WITHOUT PREVIOUS WRITTEN AUTHORIZATION.
Simplex wiring diagram:
L
R
R : line-matching resistor,
added if needed
Half-duplex wiring diagram:
L
RR
R : line-matching resistors,
added if needed
The length of the derivation should be as short as possible (< 30 cm).
The maximum length allowed can be calculated from the cable characteristics using the equation
below.
L < 1300 / (Z
0
x C
L
) L in metres, Z
O
in ohms and C
L
in pF
7.4.2. Line biasing
For RS-485, line biasing may prove necessary and must be done externally and only at one point on
the line.
The line “+” is connected to +5V via a 4K7 resistor.
The line “-” is connected to 0V via a 4K7 resistor.