KACO Powador-protect - Manual (Page 29)

Page 29
A
8.4 RS485 bus
NOTE
Ensure that the DATA+ and DATA- wires are properly
connected. Communication is not possible if the wires are
reversed.
NOTE
Different manufacturers do not always interpret the
standard on which the RS485 protocol is based in the
same way. Note that the wire designations (DATA- and
DATA+) for wires A and B may vary from one manufac-
turer to another.
8.4.1 Specification
Properties of the RS485 data line
Maximum length of
the RS485
bus line
The bus is permitted to be a maximum of
1200m long.
This length can be reached only under opti-
mum conditions.
Cable lengths exceeding 500m generally
require a repeater or a hub.
Maximum number
of bus subscribers
32
Data line Twisted, shielded. Recommendations:
LI2YCYv (Twisted Pair) black for laying cable
outside and in the ground, 2 x 2 x 0.5
LI2YCY (Twisted Pair) grey for dry and moist
indoor spaces, 2 x 2 x 0.5