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7. Connections
Circuit
No.
board
1
Out
2
I-
3
I+
4
B
5
A
6
C
7
4a
8
4b
9
3a
10
3b
30 / 140
Explanation
Brownout detection: Open collector, connected to
GND if supply voltage is sufficient.
This output activates if the supply voltage at V
below 10.0 V
(±0.5 V
DC
usually connected to the AUX relay's coil. If the sup-
ply voltage falls at V
the other relay contacts activate unchecked due to
the decreasing voltage. When the supply voltage is
applied, the output does not activate until the mod-
ule has fully initialised and relay contacts can no
longer switch unchecked.
Isolated digital input. Currently not in use.
Isolated digital input. Currently not in use.
Controller connection: Data Line B; connected to
contact for Reader 3.
Controller connection: Data Line A; connected to
contact for Reader 3.
Controller connection: Earth; connected to contact
for Reader 3.
Relay 4: Potential-free contact (NC treated as NO in
software); activated depending on authorisations.
Relay 4: Potential-free contact (NC treated as NO in
software); activated depending on authorisations.
Relay 3: Potential-free contact (NC treated as NO in
software); activated depending on authorisations.
Relay 3: Potential-free contact (NC treated as NO in
software); activated depending on authorisations.
). The earth connection is
DC
, the AUX relay activates before
IN
MOD.SOM8
falls
IN
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