Lift-master RS 485 User Manual

EARTH GROUND ROD INSTALLATION

Proper grounding gives an electrical charge, such as from an electrical static
discharge or a near lightning strike, a path from which to dissipate its energy safely
into the earth.

Without this path, the intense energy generated by lightning could be directed
towards the Phone system. Although nothing can absorb the tremendous power of a
direct lightning strike, proper grounding can protect the Phone system in most
cases.

The type and length of earth ground rods vary by region. Contact the building
inspector’s office in the municipality where you plan to install the unit for correct
grounding materials and installation procedures.

Before digging, contact local underground utility locating companies.

Avoid damaging gas, power, or other underground utility lines.

The earth ground rod must be located within 3 feet from the Phone system.

The ground wire must be a single, whole piece of wire. Never splice two wires for the
ground wire. If you should cut the ground wire too short, break it, or destroy its
integrity, replace it with a single wire length.

The earth ground rod must be located within
3 feet from the equipment being grounded.

to equipment to be grounded

12 gauge wire

For the correct depth,
consult the local code

Warning:

Not responsible for improper installation or failure to comply with all necessary
local building codes.

NC

NO

COM

COMM

RS-485

NC

GND (+) (–)

RF INPUT

ONOFF

TERMINATE

POWER

INPUT

STRIKE
RELAY

DISARM
RELAY

RS 485 SURGE SUPPRESSOR WIRING

OUTININ

OUTININ

It is important that the chassis grounds on the suppressor, RS 485 device and
Phone system are properly grounded. (Refer to Earth Ground Rod Installation.)

Install surge suppressor module within 5 ft of equipment to be protected.

1

IN

Connect the

2

the equipment to be protected. RS 485 (+) RS 485 (+)
RS 485 (-) RS 485 (-)
RS 485 (Gnd) RS 485 (Gnd)

Connect the side of the surge suppressor module to the side of

3

the next surge suppressor module. RS 485 (+) RS 485 (+)
RS 485 (-) RS 485 (-)
RS 485 (Gnd) RS 485 (Gnd)

4

Connect the green “Chassis Ground” of the surge
suppressor module to the earth ground rod.

5

Connect the chassis ground of the equipment to the
earth ground rod. (Refer to earth ground rod
installation for details)

Unprotected
Side

+

-

Gnd

side of the surge suppressor module to the RS 485 port of

OUT OUT

Protected

OUT

RS 485 (+)

RS 485 (-)

RS 485 GND

BROWN:

BLUE:

YELLOW:

GREEN:

RS 485 (+)

RS 485 (-)

RS 485 GND

CHASSIS GND

Side

12 Gauge Wire

Chassis Ground

Gnd

2

1

3

5 6

4

7

8

Chamberlain Elite Phone System

EXIT

PROGRAM

ERASE

(

NOT

equipped with a built-in surge suppressor board)

Q W

SHIFT

SPACE BAR

-

+

Protected

ENTER

HELP

E

R

D F

X

T Y U I

G H J

V

C

9 Pin

Comm Port

+

-

Gnd

B

A

S

Z

Side

9

0

N

M

O

K L

P

BACK
SPACE

’

12 Gauge Wire

Chassis

Ground

Refer to Earth Ground
Rod Installation

Unprotected
Side

OUT

RS 485 (+)

BROWN:

BLUE:

RS 485 (-)

YELLOW:

RS 485 GND

GREEN:

+

-

Gnd

RS 485 (+)

RS 485 (-)

RS 485 GND

CHASSIS GND

Protected

Side

12 Gauge Wire

Chassis
Ground

Unprotected

Side

CHASSIS GND

RS 485 (+)

RS 485 (-)

RS 485 GND

GREEN:

BLUE:

BROWN:

YELLOW:

OUT IN

RS 485 (+)

RS 485 (-)

RS 485 GND

+

-

Gnd

Refer to Earth Ground
Rod Installation

Chassis Ground

Refer to Earth Ground
Rod Installation

For toll free technical support:

1-800-528-2806