DuraComm PSDA-MU1, Owner'S Manual

Page: 7 / 47

Page 7 of 47
Log measurements and /or alarms to the on-board SD card by specifying number of minutes between
samples, and “Log Alarms”.
Set up email notifications.
Set up SNMP monitoring for larger systems.
The audible alarm can be muted manually. The mute can be cancelled manually, automatically at one or
more specific times of the day by setting up a schedule. The mute is also cancelled automatically when
the fault or alarm condition is corrected.
Adjust alarm settings to be closer or farther away from the normal test point value for each channel to
change sensitivity to changes in the managed lines, or adjust for long wire resistance. The alarm is set
for 7 volts for CH-1 to CH-6. This alarm value controls the alarm setpoint of the red alarm on the
annunciator board. Each channel can be controlled independently. The Antenna channel is set at about
2 Volts.
Fault alarm levels (Blue lights) are set to a common value by digital-to-analog converter output #1 on
the RMCU board, and this can also be programmed. This is set to 1 Volt at the factory. This controls the
actual fault reference voltage used by the annunciator board. This is one voltage common to channels 1
thru 6.
The antenna channel (CH7) fault reference is fixed at about 0.7 volt by a diode junction on the
annunciator board. The fault alarm threshold is also programmed to 0.7 volt for an approximate match
for the sake of remote monitoring. This remote monitoring threshold can be reprogrammed for the sake
of remote monitoring, but the behavior of the annunciator board is fixed to the diode junction voltage.
This voltage must be isolated from the remote monitoring board to maintain isolation from CH1 thru
CH-6 since the test point for this channel will most like be attached to the 50 Ohm shield, which will be
earth ground.