ADEMCO VISTA 5140XM Anleitung zur Fehlerbehebung PDF herunterladen (Seite 9)

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Updated: 8/17/12

Tech Note

Using the 4297 Polling Loop Extender Module (applies to panels with

128ma on polling loop)

The 4297 V-plex extender module may be used to:

1. Increase the number of V-plex polling loop loading in a given system;

2. Extend the total cable length of a specific application (See limitations of V-plex Cable Runs)

3. Provide short circuit isolation from one loop branch to another.

The maximum number of V-plex device loading that can be placed on one or more polling loops with a single

supporting control panel is 128 mA.

1. If a given control panel can support a total number of devices requiring more than 128 mA, a 4297 module

may be used in the manner demonstrated in Figure 1, below.

2. Each 4297 module can individually support up to 128 mA.

The maximum number of 4297 modules which can be configured as shown in Figure 1 is limited to no more than 8,

and by the need for a DC power supply to furnish 50ma @ 12 Vdc plus the polling loop output current per module.

For example if each 4297 module is to supply the maximum of 128 mA, it will require a supply current of

50+128=178 mA. From a local power supply, even though it only requires 0.1ma from the polling loop. If the

4297 output is shorted, the power supply current increases to 350ma.

The total wire length allowed at the output of a 4297 module, as well as for the control panel’s V-plex output, is

limited using Tables 1 and 2 and the procedures described above. In addition, the sum of the wire lengths of both the

input and output of a single 4297 is also limited to 12,000 ft. of unshielded wire and 6,000 ft. of shielded wire, as

indicated in Figure 1

Figure 1: 4297 Supplementary Power Supply

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ADEMCO VISTA 5140XM Anleitung zur Fehlerbehebung Seite 9