MCX102-BRD Operating Manual
04.12.2020
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1.
D
ESIGN AND APPLICATION
MCX102-BRD is I/O expander dedicated to the RACS 5 system. The expander operates with two PRT
series terminals or single terminal with Wiegand interface. After connection to MC16 controller the device
enables to control single door.
Characteristics
RACS 5 system I/O expander
2 NO/NC inputs
1 transistor outputs
1 relay outputs
RS485 interface
Wiegand interface
RACS CLK/DTA interface
Screw terminals
Power supply
The expander requires 12VDC power supply. The supply wire diameter must be selected in such way that
the voltage drop between supply output and the device would be lower than 1V. The proper wire diameter is
especially critical when device is located in long distance from the supply source. The minus terminal of
such PSU should be connected with MC16 controller GND terminal by means of signal wire with any
diameter. It is recommended to install PSU near the expander, preferably inside ME series enclosure.
RS485 bus
The 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.
Note: Do not use more than single pair in UTP cable for RS485 communication bus.
Wiegand bus
Wiegand interface can be used for communication with third party readers and terminals. Wiegand
communication is ensured via expander input lines (IN1, IN2) and single Wiegand terminal can be controlled
in such way by MC16 controller.
RACS CLK/DTA bus
The expander enables the control of two PRT series readers with ID=0 and ID=1 addresses by MC16
controller.
LED indicators
Expanders are equipped with LED indicators which are used to signal integral functions.
Table 1. LED indicators
Indicator
Colour
Integral function
STA
Red/ green
Current arming mode of Alarm Zone (armed/disarmed)
OPN
Green
Door unlocked
SYS
Orange
Various signalling functions including errors
