3 Installation
page 20
ELC X-Series-V1.5-06.18-GB
subject to technical alterations
3.2.12
X3: BUS T-coupler
Connector pin assignment:
The shield has to be put on Pin 1 = BUS GND.
Insulate with shrunk-on sleeve.
Pin assignment X3:
Designation
Number Description
technical
BUS GND
X3.1
GND insulated for BUS
Shield connection BUS
BUS A
X3.2
Data line BUS A
Bus signal A
BUS B
X3.3
Data line BUS B
Bus signal B
The T-coupler connection may be used as a BUS repeater. Via the T-coupler (see Fig. 15) the
BUS-data lines A and B as well as their reference ground may be applied (galvanically
insulated) to another slave device. The T-coupler already contains a termination according to
Fig. 14. Solely a bitrate of 500kbit is applicable. If the T-coupler connection is not required X3
may be left open.
Fig. 15: Schematic of the T-coupler connection
X3 is not active in MODBUS control mode.
1.4
1.3
1.2
1.1
2.4
2.3
2.2
2.1
3.1 3.2 3.3
X3
X1
X2
galvanic isolation
T-coupler
1
3
