MCX402DR Operating Manual.doc
2018-09-03
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Fig. 4 MCX402DR-BRD supply from 12VDC or 24VDC
Connection to RS485 communication bus
MCX402DR-BRD is an addressable device and it must be connected to RS485 communication bus of the
controller where MCT readers and other MCX expanders are usually also operated. Prior to connection, the
expander must be assigned unoccupied address in range of 100-115. Any topology of communication bus
can be used (e.g. star, tree). The matching resistors (terminators) connected at the ends of transmitting
lines are not required. In most cases communication works with any signal cable e.g. U/UTP cat.5. All
devices connected to the same bus should have GND terminals connected. The RS485 communication
standard in RACS 5 system guarantees proper communication in a distance of up to 1200 meters as well as
high resistance to interferences.
IN1-IN8 inputs
The expander offers 8 inputs IN1-IN8 which can be configured as NO or NC. Electric parameters of all
inputs are configured within low level configuration by means of RogerVDM software. Inputs are assigned
with functions using VISO management software.
IO1 and IO2 outputs
The expander offers two open collector type transistor outputs IO1 and IO2. Output polarity can be
configured as normal or reversed. Output with normal polarity represents high impedance in normal state
and is shorted to ground when triggered. Output with reversed polarity operates with inverted logic. It is
shorted to ground in normal state and represents high impedance when triggered. The configuration of
output polarity is done within low level configuration using RogerVDM software. By default, outputs are
configured with normal polarity. Outputs are assigned with functions using VISO management software.
REL1 and REL2 outputs
The expander offers two relay outputs REL1 and REL2. Each relay offers NO/NC terminals and REL1 is
30V/1.5A rated while REL2 is 230VAC/5A rated. In case of power outage both relays remain in the off state.
Outputs are assigned with functions using VISO management software.
AUX power output
AUX power supply output is dedicated to supply door lock, alarm signalling device and other door related
devices. The terminal AUX is protected with 1.0A electronic fuse.
TML power output
TML power supply output is dedicated to supply readers at doors. The terminal TML+ is protected with 0.2A
electronic fuse.
Door control
The expander offers power supply at door and enables the operation of PRT (RACS CLK/DTA) or Wiegand
readers with MC16 access controller. The expander offers 1.0A power output (AUX), 0.2A power output
(TML), RACS CLK/DTA communication bus and programmable inputs/outputs which can be used to control
door lock, communication with Wiegand readers and control of LEDs and buzzer of Wiegand readers. The
1.0A output is dedicated to supply door lock and door related devices (e.g. alarm signalling device). The
