Installation Instructions

SITE REQUIREMENTS AND INSTALLATION INSTRUCTIONS 25 (28)
BRU1 MANUAL, Doc.no: b1sitreq Uen Rev PA5, 2004-02-19
10 Connecting an External Alarm
It is possible to connect one external alarm to the BRU1. The connecting
procedure depends on whether the current loop is supplied with power from the
BRU1 or from an external power supply.
The following alarm connection data are given:
• Internal Resistance = 16.4 kohm
• Type Current = 0.5 mA
• Minimum Current = 0.1 mA
• Voltage = 12 V
Connect the external alarm according to the following two alternatives:
Alternative 1: Connection of external alarm with current loop powered by
using the DTR pin in the console cable.
Strap connector pins according to the drawing below.
Figure 14 Passive external alarm connection.
VCC
8K2
8K2
8
9
Alarm
92/1424-LZE 401 204 Uen Rev A
DTR (+12V)
4
5