Analogue LOOP/LINE Layouts, Line Mode | Tyco MX4428 instruction

Document: LT0273	MX4428 MXP Engineering / Technical Manual
	Analog Loop Design Considerations

4.2	ANALOGUE LOOP/LINE LAYOUTS

4.2.1LINE MODE

The MXP is designed to run in LOOP mode only. The dual line mode of the MPR is not supported. However a star configuration can be used, refer to section 4.2.3.

4.2.2LOOP DESIGN WITH SHORT CIRCUIT ISOLATORS

There are two main reasons for using isolator bases on the analogue loop.

(i)When the MXP powers up a line/loop, it will only have to power up one section of the line/loop at a time, reducing the power required by the MXP from the MX4428 supply loop during startup.

(ii)If the loop is shorted then the MXP will loose communication with only those devices on the shorted section between 2 isolators. If every detector was mounted on an isolator base, then all detectors would remain functional in the event of a single short circuit.

Refer to Figure 4.1 for an example of loop wiring with Isolator Bases.

Issue 1.5

24 March 2006

Page 4-3

MX4428 specifications

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Tyco MX4428 Analogue LOOP/LINE Layouts, Line Mode, Loop Design with Short Circuit Isolators

Models: MX4428