I.S. INTERCOM
20-278-12
TYPE ABMA4 USER MANUAL
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Issue: 05
Figure 26: R-Line break at end
The analysis of the R-Line break is the same as the analysis of voltage drop along the system cable. As you
walk along the system, the units (waking them up using the ‘Menu’ key) will have reduced R-Line voltage
depending on the length of system cable and the number of ABMA or BMA you have on the system. The
ABMA4 will go into deep sleep mode if the voltage is very low or zero. You can still take the R-Line voltage
reading by waking the unit up by pressing and holding the ‘Menu’ key for three seconds (see Background
Operation section above). If you would like more accuracy reading than the bar-graph (
±
0.5) you can go into
the ‘Comms Line’ menu (see Configuration Menu section).
Analysis 5: There is combination of the three above
Using the graphical display on the ABAM4 you can work out which units can see a V-Line, an S-Line and/or
an R/M-Line. From this you can analyze the state of the system cable.
8. HANDSET
In special cases an ABMA4 can have a handset attached, in this case the front panel microphone will be
disabled and only handset microphone will work.
9. CERTIFICATION
The intercom type ABMA4 has been certified for use as part of the Pre-Start Alarm and Communication
System type PSACS1. The ABMA4 may be used within any PSACS1 system in accordance with the rules
set forth in certificate AUS Ex 02.3829X and Austdac system certification drawing 20-035-19.
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