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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)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 48 49

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