MCX4D Operating Manual.doc
2018-07-20
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Design and application
MCX4D is I/O expander dedicated to control four doors with MCT readers (RS485) in RACS 5 system.
Additionally the expander operates as distributor of 12VDC power supply and RS485 bus. For each door the
MCX4D offers two inputs, two outputs, RS485 interface, 1.0A main power supply and 0.2A auxiliary power
supply. All outputs of the expander are protected against overload. The MCX4D is supplied from the same
13.8VDC PSU as access controller, readers and other door related devices and it offers 1.2A current per
door. The expander operates with backup battery which depending on particular requirements can be
charged with 0.3A, 0.6A or 0.9A current. The expander is equipped with removable terminal blocks which
facilitate electrical connections during installation and maintenance. MCX4D can be also used with PRT and
Wiegand readers and then such readers must be connected to the controller directly or through dedicated
expanders (e.g. MCX402DR, MCX102DR, MCX16-NT). Inputs and outputs of the expander can be
configured to any functions and used for purposes not related to door control. MCX4D is offered individually
as electronic module or as a component of MC16-PAC-3-KIT and MC16-PAC-4-KIT.
Characteristics
Power supply distribution for 4 doors
RS485 communication bus distribution for 4 doors
8 inputs NO/NC EOL/2EOL/3EOL/DW
8 transistor outputs 12V/1.0A
4 power outputs 12V/1.0A
4 power outputs 12V/0.2A
RS485 interface for communication with controller and readers
Protection against full battery discharge
Reporting of power supply status to access controllers
Battery charging with 0.3A, 0.6A or 0.9A current
13.8VDC power supply
Fig. 1 General concept of MCX4D application