a DM Group company
Control Configuration
2040
Installation Manual
Sheet.
6
RS485 Serial Connection
The coax cable and power wires are always
connected. The RS485 wires are only connected when
an external protocol converter is fitted or an RS485
controller is being used.
Set the individual RS485 address for the dome on the
blue and yellow switches fitted inside the dome
housing. Rotate the housing until the address switches
are accessible through the hole in the top of the
internal case as shown in
(Fig. 6.).
Set each switch to
its desired position as shown in table 8.
To condition the RS485 lines each 2040 dome is fitted
with a switchable termination resistor as shown in
(Fig
8.)
. When used in a 'Star' configuration
(see Fig. 9)
all
2040 domes should have their termination resistor
switched IN.
In a 'Daisy Chain' configuration
(see Fig. 7)
only the
last dome in the chain should have its resistor in with
all other domes having theirs switched OUT. The
default setting has the resistor IN.
PSU
P
drx 100
+PSU
Local
230Va.c. Input
24 Ac
Coax Video
Coax Video
Termination Resistor Out
Termination Resistor In
Termination Resistor In
Termination resistor In
RS485
Data link
Twisted Pair
(20mA)
(current loop)
4 x local
alarms
Video cable
To controller
1 to 16 Dome Cameras
1 to 16 Dome Cameras
Local
230Va.c.
Input
V
To controller
L
RS 485
Data link
(Daisy chain)
connect to
controller
PSU
Local
230Va.c.
Input
PSU
Coax Video
RS485
From the
Controller
Coax Video
Local
230Va.c.
Input
PSU
Local
230Va.c.
Input
Star
Card
Fig.8 Termination Resistor Switch
PSU
PSU
drx 100
+PSU
Local
230Va.c. Input
24 Ac
Coax Video
Coax Video
Termination Resistor Out
Termination Resistor In
Termination Resistor In
Termination resistor In
RS485
Data link
Twisted Pair
(20mA)
(current loop)
4 x local
alarms
Video cable
To controller
1 to 16 Dome Cameras
1 to 16 Dome Cameras
Local
230Va.c.
Input
Video cable
To controller
Local
24Va.c.
Input
1 to 32 Dome Cameras
RS 485
Data link
(Daisy chain)
connect to
controller
PSU
Local
230Va.c.
Input
PSU
Coax Video
RS485
From the
Controller
Coax Video
Local
230Va.c.
Input
PSU
Local
230Va.c.
Input
Star
Card
Fig.9 Star Card configuration
Fig.7 Daisy Chain configuration
Un-Terminated (Out)
Terminated (IN)
