Digital Parameter
Compared with an analog parameter, a digital parameter is a discrete value to indicate the status.
A digital sensor has only two values: normal or faulty. A digital sensor detects the status by
comparing the high level with the low level.
If the level of the digit equals to the valid level, the digit sensor does not report any alarm.
Otherwise, an alarm is generated.
For the EMU, the digital parameter includes the built-in digital parameter and the extended
digital parameter.
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Generally, the built-in digital parameter is fixed. Except the valid level, users cannot modify
other built-in digital parameters.
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The extended digital parameters can be modified, and users can configure digital sensors
as required.
1.2 Environment Monitoring Principle (ESC)
The ESC processes the environment information from relevant sensors to monitor the
environment parameters including indoor temperature and humidity, door status, water, and
smoke. The ESC communicates with the control board through the serial port, and reports the
data to the control board.
Environment monitoring is implemented as follows: The EMU and the control system are
connected through a serial port cable and they communicate with each other through the node
to subnode protocol (P2MP, RS485) or point-to-point (P2P, RS232) communication protocol.
In this way, users can monitor the environment status of the EMU directly on the EMS center.
shows the environment monitoring principles when the ESC functions as the EMU.
Figure 1-1
Environment monitoring principles
Fiber
Control board
EMS center
ESC environment
monitoring unit
External
sensor
External dry-
contact signal
Cable
Cable
Cable
NOTE
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The ESC collects the monitoring analog and digital parameters and external dry contact signals from
external sensors.
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The ESC processes the collected monitoring parameters and then reports the parameters to the control
system.
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The network management center (EMS center) can monitor alarms remotely.
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Dry contact signals refer to passive digital signals.
UA5000 Universal Access Unit
Environment Monitoring
1 Environment Monitoring Principles
Issue 01 (2012-08-17)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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