Individual Components for DB System:

DB-1MD Tenant master station, max. 1 per tenant

DB-1SD Tenant sub station, max. 4 per tenant

DA-1DS Single button door station

DA-2DS Two-button door station

DA-4DS Four-button door station

PT-1211C 15VAC transformer, 1 per DB-1MD master, and 1 per 2 DB-1SD sub stations

Pg. 2
COMPONENTS & WIRING
2
2
222
22
4444

A

B

IER-2
DB-1MD DB-1SD DB-1SD DB-1SD DB-1SD
C
2

CCC

2
DA-1DS
Request
to Exit
Button
C

Wire Distance Chart

A
B
C
22AWG
360'
330'
180'
20AWG
660'
330'
330'
18AWG
1020'
330'
510'
PT-1211C PT-1211C PT-1211C
C
2
B1
B2
B3
B4
B1
B2
B3
B4
~ ~
15V
IN
OUT
B1
B2
B3
B4
B1
B2
B3
B4
~ ~
15V
IN
OUT
B1
B2
B3
B4
B1
B2
B3
B4
~ ~
15V
IN
OUT
D
E
B1
B2
B3
B4
BL+
BL-
~ ~
15V

~ ~ ~ ~

DA-1DS
PT-1211C PT-1211C PT-1211C
DB-1MD DB-1SD DB-1SD DB-1SD DB-1SD
1
E
IER-2
Request to
Exit Button
Org
Yel
EL-12S
B1
B2
B3
B4
B1
B2
B3
B4
~ ~
15V
IN
OUT
Brn
Red

~ ~

* NOTE: Power wiring must be in a separate

jacketed cable from 4-conductor intercom wiring.

Option Switch Output for
Light, Gate, Garage, etc.
N/O Dry contact 24V 1.6A
+
-Blk
Red
Blu
Org
Org To Bell or
Light and
Power
AB
TAR-3
SKK-620
D
E
L
L
~ ~
15V
Org
Yel
Use the TAR-3 to trigger an external bell or light.
This relay can be used in place of the IER-2.
External Signaling
Optional
Device
Optional
Device
Power