Installing the sensor head 23
RS-485 to SCADA
The RS-485 can be used in full- or half-duplex mode (see Figure 5 and Figure 6 on page 23). All
signals on RS-485 (J18) are isolated.
NOTICE
Use only shielded cable for wiring the RS-485 interface.
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Figure 5 Wiring details (RS-485 in full duplex mode)
Figure 6 Wiring details (RS-485 in half duplex mode)
RS-485 Shield
6 Tx+ Terminal Description
5 GND 1 Earth GND
4 Tx– 2 Earth GND
3 Rx–
2 GND
1 Rx+
The RS-485 interface is intended to be used in point-to-point mode. There is no need to add a 120 Ω
termination on the receiver (Rx); the resistor is present on board. The transmitter (Tx) must be
terminated at the other end.
Other RS-485 topologies are not supported.
Ethernet to SCADA
ABB recommends a Cat5 Ethernet cable. Its maximum length must not exceed 100 m.
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