Andrew MR903D Benutzerhandbuch - Seite 8

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13.3.

Output-Contact Descriptions

Output1:
This is a transistor output for heartbeat
signalling. The heartbeat interval can be
set in the 1-to-72-hours range.
+5
1kOhm
output voltage.......4.75 to 5.25
output
Output2: This optocoupler output, which is signalling
the operating condition, represents the same
functionality as LED1.
Collector-emitter voltage......50 V max
Collector current..................20 mA max
open
power feed out of defined window
or LO-Alarm
or temperature-alarm
close
normal operation condition
Output3:
This optocoupler output, which is signalling
the ALC condition, represents the same
functionality as LED2.
Collector-emitter voltage......50 V max
Collector current..................20 mA max
open
ALC-Alarm, ALC active
close
normal operation condition
14.

Heartbeat Setting

In a remote monitoring system, heartbeat signalling is
a very useful method to monitor whether the
supervision connection to a device is still operational.
Without heartbeat signalling, there would be no
indication if the supervision connection failed.
The heartbeat interval can be set by means of a rotary
switch, which is accessible on the top of the
miniRepeater. Use a small screwdriver to turn the
switch carefully to the position for the required interval
(1 to 72 hours) according to the label in the cover.
Andrew Wireless Systems GmbH * Industriering 10 * 86675 Buchdorf * Germany *
Page 8
current.......20
mA
Phone: +49 9099 69-0 * Fax: +49 9099 69-930 *
email: [email protected] * http://www.andrew.com
MR803D, MR853D, MR903D and MR1903D
0
not allowed
1
not allowed
Heartbeat-switch settings
miniRepeater with cover

15. List of Changes

Version
Changes
M0041AMA
M0041AMB
-
Mikom
changed
into Andrew Wireless
Systems GmbH
- Chapter 1 changed
- Chapter 5 changed
- Chapter 7 changed
User's Guide for
2
1 h
A
24 h
3
2 h
B
30 h
4
3 h
C
36 h
5
4 h
D
48 h
6
5 h
E
60 h
7
6 h
F
72 h
8
12 h
9
18 h
Position of the rotary
switch for setting of
heartbeat interval
Release
Date
07-Feb.-06
GmbH
21-Nov.-06
its
name