Fermax EXP8-IO Manual De Instrucciones página 11

Cod. 970092 V12_20
Fig. 1 EXP supply from AC-MAX CU access controller
Fig. 2 EXP supply from dedicated power supply unit
Bus RS-485
The communication method with AC-MAX CU access controller is provided with RS-485 bus which can
encompass up to 16 devices of AC-MAX system, each with unique address in range of 100-115. The bus
topology can be freely arranged as star, tree or any combination of them except for loop. In most cases
communication works with any cable type (standard telephone cable, shielded or unshielded twisted pair etc.)
but the recommended cable is unshielded twisted pair (U/UTP cat.5). Shielded cables should be limited to
installations subject to strong electromagnetic interferences. The RS485 communication standard used in the
AC-MAX system guarantees proper communication in a distance of up to 1200 meters as well as high
resistance to interferences.
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