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6.4.1
Power supply
6.4.2
RS485 interface
(with active termination)
6.4.3
Clock/Data interface
Siemens Building Technologies
Fire & Security Products
The power is supplied through terminals [+ / ~] and [- / ~]. The unit can run off
12 to 24 V either AC or DC. For DC voltage supply, either polarity can be selected.
Notes:
The length of cable between the power pack and the reader should be kept as short as possible.
The lead must not be laid parallel to other energy supply and low voltage cables.
The minimum supply at the unit must be 10.2 V.
With RS485 data buses it can be necessary to use terminating resistors. These
checks should be made for each installation. Generally, a terminating resistor is
only required at the end of the bus, i.e. on the last unit. In order to do this, a bridge
needs to be set up between terminals 1 and 2 of terminal X2 (see Fig. 11).
To operate the bus, you need a controller with a terminating resistor and active
termination (see below).
Controller
AR 618x-MX
A
B
without terminating resisto r
Fig. 9
Operating a bus with an RS485 interface
The reader connection using the Clock/Data interface has to be done according to
figure below. The cable length is limited to a maximum of 100 cm.
UCI-Box
or
DCU-3
Fig. 10
Connection using Clock/Data interface
AR 618x-MX
X 2
X 2
CLOCK
DAT
CLS
GND / +V
IN1 / IN2
Installation
AR 618x-MX
X 2
T/B
with terminating resisto r
CLK / D0
DAT / D1
CLS
AR6181-MX
GND / +V
IN1 / IN2
R/A
13
12.2004
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