Technical data

Safety Instructions and Warranty Terms 12
Manual econ sens+ Version 1.40
RS485-Interface
The econ sens + supported on this interface the following protocols:
 Modbus RTU
Modbus RTU
Via the RS485 Modbus RTU protocol, the values "Modbus / pulses / s submenu " p.17 ff) can be
retrieved according to section.
To use Modbus RTU a Modbus master is required. In a segment of up to 32 devices can be connected
together. For more than 32 devices in a segment repeaters are required. The wiring of components is
a “linear structure”, as shown in Fig 13. Other bus topologies, such as Star shape is not possible.
At the beginning and end of a segment, the cable is terminated with resistors (bus termination). Put
between lines A and B a 120 Ω termination resistor. As a connecting line between the devices we
recommend a shielded cable 2x2x0, 8, for example, Belden YE00820 or a Cat 5 network cable. The
maximum length is 1200 meters.
Figure 13: Assignment of the RS485 outputs (here with one econ sens+ as gateway)