Chamberlain Liftmaster ULTRX900R Installation Manual Download Page 1

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Overview

The Ultra RX - Extreme Range Receiver has a 
10-24Vac/Vdc operation. The Receiver has 4
Channels, 2 Transistors and 2 Relays. The Receiver
can control up to 4 devices.

1

Receiver

Model ULTRX900R

Ultra RX - Extreme Range Receiver

Setup

10-24 Vac

-

+

10-24 Vdc

NOTE:

Polarity does not matter.

Power Connections

Relay Outputs

The Receiver has 2 Relays and 2 Transistor (Open
Collector) Outputs to control up to 4 devices.
Higher Amperage (10 amp) applications that are
directly controlled, should use Relay Channels 1 
and 2.

Relay 1:
11:

Common

12:

Ch 1 Normal Open

13:

Ch 1 Normal Closed

1

3

2

4

5

6

7

8

9

10 11

12 13

Relay 2:
8:

Common

9:

Ch 2 Normal Open

10:

Ch 2 Normal Closed

Lower Amperage (500 ma or lower) applications that
are indirectly controlled, should use Transistor Output
Channels 3 and 4.

Channel 3:

Terminal 5

Channel 4:

Terminal 4

1

3

2

4

5

6

7

8

9

10 11

12 13

1

3

2

4

5

6

7

8

9

10 11

12 13

1

3

2

4

5

6

7

8

9

10 11

12 13

Dipswitch Settings

NOTE:

To verify, apply a resistance load of 200 ohms

between positive power (1) and terminal 6 or 4.
Measure voltage between negative power (3) and
terminal 6 or 4. When transmitter signal is received,
the transistor should clamp the voltage down.

NOTE:

The Dipswitches on the

Receiver can be accessed by
removing the screw on the
bottom of the Receiver.

NOTE:

Do not connect power until instructed to do so.

Default Dipswitch configuration.

1

13

12

11

10

9

8

7

6

5

4

3

2

1

13

12

11

10

9

8

7

6

5

4

3

2

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