
Manual Datafox ZK-MasterIV
Caution:
The installation and connection of the TMR33 module may only be carried out by
a person qualified in this field. Avoid switching the connecting terminal (reverse
polarity).
From this arise different possible combinations. The following figures show examples for the connection
wiring.
3.6.2.1 Wiring
In most cases a shielded twisted pair cable is used as transmission medium for the assembling of a RS485
bus. It should be a twisted pair cable because that way the voltages induced by an electromagnetic field
work opposite and thus offset each other.
In accordance with the specifications (TIA-EIA-485-A) the maximum cable length depends on the trans-
mission rate.
length of segment [m]
100
200
400
1000
1200
data rate [kBit/s]
12000
1500
500
187,5
9,6
Table 8: Cable length dependent from the data rate
Our recommendations for a data cable are the following types of cables: Li-YcY 2x2x0,5
mm
2
, J-2YY
2x2x0,5
mm
2
oder J-Y(ST)Y 2x2x0,5
mm
2
(Cat5 shielded).
Caution:
When erecting an access control system, a calculation of the maximum cable length,
the necessary cable cross-section and voltage supply has to be done in any case. See
chapter
for further hints.
Version: 04.01.07.00
Page
67
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Содержание ZK-MasterIV
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