Roger MCX402-BRD, Руководство по эксплуатации, Страница: 2 / 13

MCX402-BRD Operating Manual 04.12.2020
2/13
1. D
ESIGN AND APPLICATION
MCX402-BRD is I/O expander dedicated to the RACS 5 system. Depending on uploaded firmware the
expander operates with two Wiegand interface terminals or two PRT series terminals. After connection to
MC16 controller the device enables to control single door. The expander operates with backup battery which
can be charged with 0.3A current. MCX402-BRD expander is offered separately or as a component of
MC402-1-KIT and MC402-2-KIT.
Characteristics

RACS 5 system I/O expander

Power supply distribution for door devices

8 NO/NC inputs

2 transistor outputs

2 relay outputs

2 power supply outputs

Backup battery charging

RS485 interface

Wiegand interface

RACS CLK/DTA interface

Screw terminals
Power supply
The expander can be supplied with 24VDC or 18VAC and in such scenario it offers 13.8VDC power supply
outputs (AUX, TML) and backup battery charging. Alternatively the expander can be supplied with 12VDC
but then it does not offer power supply outputs and battery charging.
The expander charges backup battery with 300mA stabilized current up to 13.8V. Backup power supply is
activated automatically in case of main powers supply shortage. If the voltage at backup battery drops below
approx. 10V then the battery is automatically disconnected from expander and remains disconnected until
mains power supply returns.
Note: MCX402-BRD expander cannot be started using only power supply from backup battery.
Fig. 1 MCX402-BRD power supply
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