Power Supply; Rs485 Interface; Clock/Data - Interface - Siemens AR6181-MS Operating Instructions Manual

3.1.1

Power supply

3.1.2

RS485 interface

Controller
(with active termination)
3.1.3

Clock/Data - Interface

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The power is supplied through terminals [+ / +V] and [- / GND]. The unit can run off
12 – 24 V DC.
NOTE
The length of cable between the power pack and the reader should be kept as short as possible. The
lead should not be laid directly parallel to other energy supply and low voltage cables.
With RS485 data buses, it can be necessary to use terminating resistors. For each
installation, checks should be made as to whether it is necessary to use terminat-
ing resistors. Generally, a terminating resistor is only required at the end of the
bus, i.e. on the last unit. In order to do this, switch DIP switch 10 in ON-position.
To operate the bus, you need a central computer with a terminating resistor and
active termination (see Fig. 5 Operating a bus with an RS485 interface)
DIP 10 OFF
AR 618x-MS
B
A
without terminating resistor
Fig. 5 Operating a bus with an RS485 interface
The reader connection using the Clock/Data interface has to be done according to
figure 6. The cable length is limited to a maximum of 100 cm.
UCI-Box,
DRI
or
DCU-3
Fig. 6 Connection, using Clock/Data interface
DIP 10 OFF
AR 618x-MS
CLOCK
DAT
CLS
GND
Led red/ green
Setting up
DIP 10 ON
AR 618x-MS
T/B R/A
with terminating resistor
CLK
DAT
AR6181-MS
CLS
GND
Led red/ green
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