The Environment Monitoring Unit for DTRU BTS (DEMU) is a
built-in engironment monitoring unit, functioning as an external environment
alarm box. It monitors and controls the environment variables, Boolean values
and analog variables, processes alarms, and guarantees secure and reliable
operations of the BTS.
The DEMU performs the following functions:
l
Communicating with the DTMU through the
connection between the RS485 on the DEMU and CBUS3 on the DTMU, achieving
environment monitoring and control
l
Detecting 32-path Boolean value alarm input
l
detecting temperature and humidity, and 4-path
analog variable
l
detecting 4-path dedicated analog variables
(door access control, water, infrared and smoke)
l
Detecting 6-path Boolean value output
l
Monitoring the power supply
The operating temperature
of the BTS3012 is –10° C
to +55° C.
The range of the temperature sensor for DEMU selection is –20° C
to +80° C.
Pay attention to the
following two factors when setting temperature alarm threshold:
l
When you set the low-temperature alarm point to
a value smaller than –20° C, the DTMU automatically converts
the value to 0° C
and set to the DEMU.
l
When you set the high-temperature alarm point to
a value greater than 80° C, the DTMU automatically
converts the value to 45° C and set to the DEMU.
The probable causes for a
DEMU/EAC-2 environment alarm "Sensor Storage Parameter Alarm” are DEMU/EAC-2
internal control chip faults, including EEPROM fault, ADC fault, CPLD fault,
and external sensor power supply failure.
Check whether the 12V/24V
power supply for the external sensor is short circuited.
If yes, remove the short
circuit (which may burn the fuse of the monitor unit in the alarm box). Even if
the short circuit is removed, the alarm box cannot supply power for the
external sensor. If the alarm persists, replace the DEMU/EAC-2.
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