8 Connections
1
5
4
3
2
9
8
7
6
10 11 12 13 14
28
22
23
24
25
26
27
18
19
20
21
15
16
17
No.
Circuit
board
Explanation
1
Out
Brownout detection: Open collector, connected to GND
if supply voltage is sufficient.
This output activates if the supply voltage at V
IN
falls
below 10.0 V
DC
(±0.5 V
DC
). The earth connection is usu-
ally connected to the AUX relay's coil. If the supply
voltage falls at V
IN
, the AUX relay activates before the
other relay contacts activate unchecked due to the de-
creasing voltage. When the supply voltage is applied,
the output does not activate until the module has fully
initialised and relay contacts can no longer switch un-
checked.
2
I-
Isolated digital input. Currently not in use.
3
I+
Isolated digital input. Currently not in use.
4
B
Controller connection: Data Line B; connected to con-
tact for Reader 3.
5
A
Controller connection: Data Line A; connected to con-
tact for Reader 3.
6
C
Controller connection: Earth; connected to contact for
Reader 3.
7
4a
Relay 4: Potential-free contact (NC treated as NO in
software); activated depending on authorisations.
SOM + SREL3.ADV
(Manual)
8. Connections
12 / 27
