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TSX SCY 11601/21601
Connection of
network units
The network is made up of one shielded twisted pair. The connection of the
network's different units is carried out as follows:
STEP
Integral
Characteristics
96
INSTRUCTION
1
Link all outputs labeled + (Tx+, Rx+) to the network wire labeled: L+.
2
Link all outputs labeled - (Tx-, Rx-) to the network wire labeled: L-
3
Adapt the impedance of the network to the average of the two adaptation elements
(Rc) located on the two end stations of the network.
4
Connect the wire L+ to 5 V and the wire L- to 0.V via the two polarization resistors
(Rp = 470 Ω) to achieve distributed polarization of the network.
This polarization continuously circulates a current in the network.
Adaptation can be anywhere on the network (in practice it is generally done at
master level).
There must be single polarization for the entire network, whatever its range.
Integral characteristics are:
l Up to 32 stations,
l Maximum range: about 1300 m,
l Bus topology,
l ≤ 15 m Branching,
l 2 wire half duplex,
l Adapting the line end on end units,
l Distributed line adaptation Rp = 470 Ω.