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Data Concentration Unit (DCU):
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Function
The
Data Concentration Unit
(DCU) is designed to reduce the complexity and the
amount of data collection tasks at the
Central Station
(CS) by acting as an intermediate data collection
point.
The DCU collects the meter reading
data from or via the
Meter Interface Unit
(MIU) or
Acquisition Terminal Unit
(ATU) and stores it for batch retrieval by the CS. This
way, instead of communicating with each meter. The
Central Station can just obtain the data from a much
fewer number of DCUs. This method of concentrating the
data before CS retrieval is especially useful when the
number of meters become large.
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Operating Principle
A DCU can connect with up to maximum
1,000 meters. The data/status stored in each MIU or ATU
is retrieved through various local communication
network, I.e. Power Line Carrier (PLC) or Hardwire bus
(M-bus).
When a meter is installed, its
initial settings (parameters) are programmed to MIU or
ATU by a Handheld Unit (HHU).
The same information is transferred
into the DCU by infrared port of the HHU or via remote
data download from the CS. All new meters are
automatically added to the call list for cyclic polling.
At each polling, the current reading
together with the meter/MIU/ATU status is retrieved and
stored in the DCU.
All data in DCU is stored in
non-volatile memory (EEPROM) that will not be affected
by power loss. The DCU also comes with a backup battery
to support real time clock operation in case of power
loss.
The standard DCU comes with an
on-board PSTN modem and surge protection device.
Depending on user requirements, DCU can be configured
with GPRS/GSM modem if wireless communication with CS is
desired.
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Technical Specifications
|
Item |
CGZ032-1000J (PLC) or
CGL032-1000J (M-Bus) |
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Power Supply |
220V A.C.
±20%;
50Hz ±5% |
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Power Consumption |
≤10W |
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Operating Environment |
Temperature: -10~70℃;
Relative Humidity: 98% |
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Upper-tier Communication |
PSTN or GPRS or GSM |
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Lower-tier Communication |
PLC:BPSK 500bps or M-Bus: FSK
400bps |
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Maximum Capacity of Meters |
1000 |
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Memory |
ROM:64K Bytes and SRAM: 1M
Bytes |
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Real Time Clock |
<0.5 s/day, with time
calibration function |
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Clock Backup Battery |
3.6V D.C. 1.2Ah Lithium
Battery |
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Communication Port |
RS485、RS232
and Infra-red |
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Communication Modem |
PSTN or GPRS or GSM |
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Line Surge Protector |
Integrated |
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