MCT88M-IO Operating Manual.doc
2019-03-06
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Fig. 1 MCT88M-IO supply from dedicated power supply unit
Fig. 2 MCT88M-IO supply from MC16 access controller
RS485 bus
The primary communication method with MC16 access controller is provided with RS485 bus which can
encompass up to 16 devices of RACS 5 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. The matching
resistors (terminators) connected at the ends of transmitting lines are not required. 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 RACS 5 system guarantees proper communication in a distance of up to 1200 meters as well as high
resistance to interferences.
