Connection of the instrument 23
Manual econ sens3 Version 3.0
The cable must be terminated with resistors (bus termination) at the beginning and at the end of each
segment. For this purpose, a 120 Ω termination resistor should be placed between the A and B cables.
To do this with the econ sens3, move the slide switch “Term” on the instrument front to “ON.” The bus
length must not exceed 1200 meters.
Cable recommendation
Generally a two-core, twisted, and shielded cable with a characteristic impedance of 100-130 Ohm is
suitable as a transmission cable for Modbus. An EIB bus cable (e.g. Belden YE00820) can also be
used for shorter transmission paths (up to 200 m simple path). Cat 5 or higher bus cables such as
Unitronic Li2YCY(TP) 2x2x0.22 (Lapp Kabel) are also suitable for Modbus data transmission.
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