-12-
Using Call Dry Contacts with AC
The dry contacts can be used to switch devices such as an auxiliary sound
or light when call is depressed. The maximum ratings for the dry contacts
are 0.4 amps at 125 Vac and 1.25 amps at 24 Vdc. This method assures a
call is received even when the volume on one of the intercoms is turned all
the way down.
Figure 7.
290A3082
24 VDC
GROUND
REMOTE
AUDIO +
AUDIO
-
DRY CONTACT
DRY CONTACT
24 VDC
GROUND
REMOTE
AUDIO +
AUDIO
-
DRY CONTACT
DRY CONTACT
NEUTRAL
HOT
EARTH GND.
NEUTRAL
HOT
EARTH GND.
INTERCOM I
310LD-MV MASTER
J7
J2
J2
J7
INTERCOM II
310LD-MV SLAVE
USING CALL DRY
CONTACTS WITH AC
1K
1 WATT
7
6
5
4
3
2
1
3
2
1
3
2
1
7
6
5
4
3
2
1
POWER
POWER
AC
AC
No Remote Power Available
Intercom I supplies the DC power to the second intercom. Earth ground
must be wired on the second unit.
Figure 8.
290A3083
24 VDC
GROUND
REMOTE
AUDIO +
AUDIO
-
DRY CONTACT
DRY CONTACT
24 VDC
GROUND
REMOTE
AUDIO +
AUDIO
-
DRY CONTACT
DRY CONTACT
NEUTRAL
HOT
EARTH GND.
NEUTRAL
HOT
EARTH GND.
INTERCOM I
310LD-MV MASTER
J7
J2
J2
J7
INTERCOM II
310LD-MV SLAVE
NO REMOTE POWER
AVAILABLE
1K
1 WATT
7
6
5
4
3
2
1
3
2
1
3
2
1
7
6
5
4
3
2
1
AC
Summary of Contents for 310LD-MV
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