Rs485 Interface Diagram - MGE UPS Systems SineWave JBUS Manuel D'installation Et D'utilisation

RS485 interface diagram

For proper operation, the polarity of EIA
RS485 2-wire and 4-wire lines must be
set at only one point and the lines
terminated at the end.
This principle is illustrated by figure 1
(2-wire topology) and by figure 2
(4-wire topology).
MGE UPS SYSTEMS
Topology of a 2-wire inter-cubicle link
5V
Rp
polarity
connec-
tion if end
of the line
Ra
connec-
tion if end
of the line
polarity
Rp
0V
transmit / receive
data
Master unit
Fig. 1
Diagram of a 4-wire inter-cubicle connection
5V master
transmitter
Rp
polarity
polarity
Rp
0V transmit data
5V
slave
Rp
receiver
connec-
tion if
end of
the line
Ra
connec-
tion if
end of
the line
Rp
0V
receive data
master unit
Fig. 2
SineWave™ JBUS communication system installation: E-51027160XT/AC
5V
Rp
2
L- L-
3 4 5
Ra
7
L+ L+
6 8 9
Rp
0V
transmit / receive
data
board of an intermediate
cubicle (see fig. 3-D)
5V slave
receiver
Rp
2
T- R-
3 4
Ra
7
T+ R+
6 8
Rp
0V receive data
slave
transmitter
R- T-
5
R+ T+
9
transmit data
board of an intermediate
cubicle (see fig. 4-D)
5V
Rp
2
L- L-
matching
3 4 5
Ra
7 matching
L+ L+
6 8 9
Rp
0V
transmit / receive
data
board of an end-of-line
cubicle (see fig. 3-C)
5V slave
receiver
Rp
2
R- R-
3 matching 4
Ra
matching
7
R+ R+
6 8
Rp
0V receive data
slave
transmitter
T- T-
5
T+ T+
9
transmit data
board of an end-of-line
cubicle (see fig. 4-C)
3