NORD Drivesystems BU0050 - Manual (Page 11)

1.2 USS - Modules
BU 0050 GB-3111 Subject to technical amendments 11
RJ 12 socket (X11)
In addition to the RS485 interface, the RJ12 socket also provides an interface for communication via RS 232.
However, the RS232 interface is only intended for connecting a PC.
If a network is to be set up with several participants which communicate via USS (frequency inverters), it
must be noted that communication must be via RS 485.
The RS232 interface (contacts X11:TXD and X11:RXD) cannot be deactivated on the frequency inverter. In
order to prevent a short circuit of these data cables and therefore the destruction of the RS232 driver, the
contacts TXD, RXD and +5V must not have a common connection to several frequency inverters.
Contact Function Data Description / wiring suggestion
DIP switch 1/2 (top side of frequency inverter)
DIP-1 Termination resistor for RS485 interface
(RJ12); ON = switched in
[Default = "OFF"]
For RS232 communication DIP1 to "OFF" X11 X10 X9
V
R
E
F
1
0
V
A
G
N
D
0
V
A
IN
1
+
A
IN
2
+
A
O
U
T
1
D
IG
I
N
1
D
IG
I
N
2
D
IG
I
N
3
D
IG
I
N
4
V
O
+
1
5
V
D
G
N
D
0
V
11 12 13 14 16 22 23 24 25 42 40 21
D
IG
I
N
5
1 2 3 4
R
E
L
2
.2
R
E
L
2
.1
R
E
L
1
.2
R
E
L
1
.1
C
A
N
_ H
C
A
N
_ L
C
A
N
_ G
N
D
nc C
A
N
_ S
H
L
D
C
A
N
_
G
N
D
nc C
A
N
_ 2
4
V
C
A
N
_ H
C
A
N
_ L
C
A
N
_ G
N
D
nc C
A
N
_
S
H
L D
C
A
N
_ G
N
D
nc C
A
N
_ 2
4
V
R
S
4
8
5
_
A
R
S
4
8
5
_ B
G
N
D
T
X
D
R
X
D
41
V
O
+
5
V
+
5
V
1 2
ON
V
R
E
F
1
0
V
A
G
N
D
0
V
A
IN
1
+
A
IN
2
+
A
O
U
T
1
D
IG
I
N
1
D
IG
I
N
2
D
IG
I
N
3
D
IG
I
N
4
V
O
+
1
5
V
D
G
N
D
0
V
11 12 13 14 16 22 23 24 25 42 40 21
D
IG
I
N
5
1 2 3 4
R
E
L
2
.2
R
E
L
2
.1
R
E
L
1
.2
R
E
L
1
.1
C
A
N
_ H
C
A
N
_L
C
A
N
_ G
N
D
nc C
A
N
_ S
H
L D
C
A
N
_ G
N
D
nc C
A
N
_ 2
4
V
C
A
N
_ H
C
A
N
_ L
C
A
N
_ G
N
D
nc C
A
N
_S
H
L D
C
A
N
_ G
N
D
nc C
A
N
_2
4
V
R
S
4
8
5
_ A
R
S
4
8
5
_ B
G
N
D
TX
D
R
X
D
41
V
O
+
5
V
+
5
V
SK 511E and above
RS232/485 DIP CAN/CANopen
DIP-2
Termination resistor for CAN/CANopen
interface (RJ12); ON = switched in
[Default = "OFF"]
Terminal connection (X7:73/74)
Above configuration level SK520E the frequency inverters are equipped with an additional terminal block
(X7). This provides the possibility of setting up the RS485 bus communication via contacts 73 and 74.
Terminal Function Data Description / wiring suggestion
X7:73
Data cable RS485
Baud rate
9600…38400Baud
Termination resistor
R=120

BUS connection parallel to RS485 on RJ12 plug
NOTE: The termination resistance of DIP switch 1 (see
RJ12/RJ45) can also be used for contacts 73/74. X7:74
NOTE
To ensure reliable communication, a termination resistor (DIP switch DIP1) must be set at both
ends of the bus.