Door
s
ta
tion/power su
pply unit
s
Door station/power supply units
21
* Please note the red mark – see “Bus connections in the door station” on page
☞
16
.
** Open: without busy function
Bridged: Busy function
***Fit system bus connector (see Page
☞
6
)
Circuit diagram:
Expansion to two door stations.
Setting the operating mode
Door selector switch 1 4982 can operate in operating modes with or without the busy function. The operating mode
is set using a bridge between terminals AV and BV. The busy function operating mode is set with a bridge.
Busy function: ON
An existing link between a door station and the system is maintained. The bell button cannot be operated from another
door station for approximately 25 seconds whilst the link exists.
Caution!
Malfunction caused by signal overcoupling.
The lines for connecting the door stations to the door selector switch must not be in a sin-
gle cable.
Note:
If more than one door selector switch is used, line 41 must be connected across the joints.
21
11 a1 b
b
b
a2
a3
N
L
4
3
2
1
1 2 3 4
2
21
1
A2 A21
A1
B2 B21
B1
41
BV
AV
Va Vb Va Vb Va Vb
1 7573
1 4760
RiTTO
1 4760
RiTTO
1 4982
1 4753
1 4753
4
3
2
1
a1
ED
ED
b
a
ED
ED
ED
b
a
ED
ED
ED
b
a
ED
1 7630
1 7630
1 7630
S0003-2
