ADEMCO 4120XM Betriebsanweisung PDF herunterladen (Seite 25)

Ground Start Module

Not intended for use in UL Listed applications.

An optional 675 Ground Start module

can be used for installations having

telephone lines which require ground start instead

of loop start operation to

obtain dial tone from the telco central office. If used, program field 1

●46 must be

set to “O” and the 675 Ground Starl Module must be connected to the control’s

terminal 9 (zone 1 high side)*, to auxiliary power, and to the “RINGmside of the

telephone line as shown in Figure 5.

● Wired Zone 1 cannot then be used as a protection zone.

Use the following procedure to determine which side of the telephone line is the

“RING” side:

a) Connect the “+” lead of a DC voltmeter to earth ground, and the “-” lead to one

side of the telephone line.

b) The wire which reads +50VDC is the “RING” side.

When the control has a message to transmit to the central station, it will seize the

line, go off hook, and then trigger the 675 module to connect the “RING” side of

the telephone line to earth ground. The control will cause the module to break the

connection between “RING” and earth ground when a dial tone is obtained.

INCOMING TELCO LINES

—

/ /

/’

‘RJ31x

JACK

USE RJ31X

CORD NO.

MO-366.

LOCALPHONES

Figure 4. PHONE LINE CONNECTIONS

TO TERM 25

BROWN

Figure 5. GROUND START CONNECTIONS

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ADEMCO 4120XM Betriebsanweisung Seite 25