eta plus ELC X Series - X1; X2: BUS Connections

3 Installation page 19
ELC X-Series-V1.5-06.18-GB subject to technical alterations
3.2.11 X1 / X2: BUS connections
To ensure secure data transmission the use of a BUS-specific cable is
recommended.
Connector pin assignment:
Fig. 14: BUS-termination
The shield has to be put on Pin 1 = BUS GND. Insulate with shrunk-on sleeve.
The contacts of X1 and X2 are internally connected.
The RS485 BUS has to be terminated at the end of the BUS line according to PROFIBUS-Norm
IEC 61158 (also see Fig. 14). On the last ballast one of the connectors X1 or X2 will be left
open and can be used for the termination (available as accessories).
Pin assignment X1 / X2 for BUS:
Designation
X1
X2
Description
technical
BUS GND
X1.1
X2.1
GND insulated for BUS
Shield connection BUS
BUS A
X1.2
X2.2
Data line BUS A
Bus signal A
BUS B
X1.3
X2.3
Data line BUS B
Bus signal B
BUS VCC
X1.4
X2.4
external supply voltage 5V
insulated for BUS
+5V DC insulated, output for
terminator only
Pin assignment X1 / X2 for MODBUS:
Designation
X1
X2
Description
technical
BUS GND
X1.1
X2.1
GND insulated for MODBUS
Shield connection MODBUS
BUS A
X1.2
X2.2
Data line A
Inverting In-/Output
BUS B
X1.3
X2.3
Data line B
None inverting In-/Output
BUS VCC
X1.4
X2.4
external supply voltage 5V
insulated for Bus-termination
+5V DC insulated, output for
terminator only

5V
A
B
390 Ω
390 Ω
220 Ω
1
4