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1. Product Introduction

Concentrator is the key equipment in low voltage power line carrier electric energy meter reading system. The downlink channel has low voltage power line carrier and RS485 serial communication channel. It can copy automatically by the carrier channel and store all kinds of carrier communication function of intelligent instrument, data acquisition module, and other various carrier equipment power, and can through the RS485 channel 485 electric energy meter data acquisition outside; Also can pass the uplink channel data interaction with host or handheld devices, its uplink channel uses a public network, support the client and server two communication modes, and uses the modular design, it can directly change the communication mode by replacing the communication module.
It is in accordance with the relevant standards of IEC, the communication agreement between the main station and concentrator of the state grid power information acquisition system, and the relevant technical conditions and type specifications of the state grid.

Q/GDW 1373-2013 

Function specification of power user information acquisition system

Q/GDW 1374.2-2013  

Part 2: centralized electric energy meter reading terminal specification

Q/GDW 1375-2013

Power consumer information acquisition system type specification

Q/GDW 1376.1-2013

Part 1: master station and acquisition terminal communication protocol

Q/GDW 1376.2-2013  

Part 2: local communication module interface protocols of concentrator

Q/GDW 1376.3-2013

Part 3: acquisition terminal remote communication module interface protocol

2. Performance Indicators

Table 1 electrical performance indicators



Power supply

Three-phase four-wire power supply: A, B, C, N

Power supply voltage: can work normally within 20% of rated voltage (230/400v)

Normal working frequency: 50 Hz deviation -6% ~ + 2%

Total power consumption: apparent power15VA, active power10W

Environmental conditions

Reference temperature of 23 ℃, reference the humidity is 40% ~ 60%

Atmospheric pressure: 63.0kPa ~ 108.0kPa (altitude: 4000m and below), except special requirements.

Mechanical properties

Can withstand the normal operation of mechanical vibration and normal transportation conditions under mechanical vibration and impact without causing failure and damage. The mechanical vibration intensity requirements are as follows:

Frequency range: 10Hz ~ 150Hz

Displacement amplitude: 0.075mm (frequency less than 60Hz)

Acceleration amplitude: 10m/ s2 (frequency > 60Hz)

Electromagnetic compatibility (EMC)

Electrostatic discharge: 8kV, direct and indirect

RF radiation electromagnetic field immunity: 10V/m

Anti-disturbance capability of electric fast transient pulse group:

Communication line pulse signal input line: 1.0kV (coupling)

State signal input loop: 1.0kV

Power circuit: 4.0kV

Power frequency magnetic field immunity: 400A/m

Surge immunity:

State signal input loop: 1.0kv (common mode)

Power circuit: 4.0kV (common mode), 2.0kV (differential mode)

Internal clock accuracy


3. Working Principle Diagram

4      Functional Features

4.1      Function Configuration

Table 2 Centralized function configuration

The serial number



The data collection

electric energy meter data collection

The terminal can collect the corresponding data items of the specified electric energy electric energy meter in real time.

The data of the electric energy meter is collected automatically according to the electric energy meter reading scheme set by the main station.

Automatic supplementary reading, the concentrator should have automatic supplementary reading function to the electric energy meter that has not read the data within the specified time.

Event recording data

Event recording data recorded by concentrators and electric energy meters.


Data management and storage

Real-time and current data

Generate and store real-time and current data.

Historical  daily date

The data collected by the terminal will form various historical date data at the end of the day (at midnight of the next day) and keep the data of the last 62 days.

Historical monthly data

The data collected by the terminal will generate various historical monthly data at the end of the month (at the end of the month (at the end of the month (on the first day of the month) and keep the monthly data of the last 12 months.

Search the electric energy meters

Support the function of searching electric energy meters.

Report the electric energy meter incident

Terminal monitor the operation condition of electric energy meter, electric energy meter open cover records, electric energy meter terminal block open cover records, electric energy meter tripping events, electric energy meter closing, electric energy meter reset events, etc., according to the requirements of the event log and abnormal data recorded in time.


Parameter Settings and queries

Current time reading and synchronization time

The terminal shall be able to receive the clock call and timing commands of the master station or local handheld device. The timing error shall not exceed 5s. The running time error of the terminal clock within 24 hours is less than 0.5 s. After the power is out of power, the clock keeps working normally. The local channel can broadcast the time to the electric energy meter in the system.

Terminal parameter Settings and queries

The terminal can be set and query terminal file, communication address, terminal configuration and configuration parameters, communication parameters and so on by the main station and handheld device.


The data transfer

Communication with main station

(1)According to the requirements of the command of the main station, the terminal regularly or randomly sends to the main station all kinds of information such as power collected and stored by the terminal, maximum demand, power indication and state quantity, etc.

(2)The communication protocol with the main station conforms to Q/GDW 1376.1-2013 communication protocol of power user electricity information acquisition system: communication protocol between the main station and the acquisition terminal.

(3)The terminal has flow control measures.

Communicate with the electric energy meter

The terminal communicates with the electric energy meter and copies and stores the data of the electric energy meter according to the set copying interval. The data forwarding command of the main station can be accepted, and the data of the electric energy meter can be transmitted directly to the main station through the remote channel.


Local function

Local status indication

With power supply, working status, communication status and other indicators.

User data interface

The terminal has a local maintenance interface, which can be used for terminal parameter setting, software upgrading, etc. The local user interface can provide the user data service function.


Terminal maintenance

Self - check, abnormal record

The terminal can automatically carry out self-inspection and find the abnormal equipment should have the function of event recording and alarm.

Terminal initialization

After receiving the initialization command issued by the main station, the terminal initializes the hardware, parameter area and data area respectively. The parameter area is set as the default value and the data area is reset.

The remote upgrade

(1)Software upgrade: terminal software can be upgraded online through remote communication channels.

(2)Breakpoint continuation: when the terminal downloads remote software, the terminal software has breakpoint continuation capability.

(3) Terminal version information: the terminal can query terminal version information by local display or remote call testing.

(4)Traffic statistics: the terminal can count the communication traffic with the main station.

Module information

The terminal can read and store the wireless public network communication module model, version, ICCID, signal strength and other information.

The terminal can read and store local communication module supplier, model and software version information


Grounding resistance capability

The power of the concentrator by the effective earthing system or of a three-phase four-wire distribution network neutral point grounding system power supply, 10% in ground fault and relatively overvoltage, under the condition of no grounding of two relatively voltage will be 1.9 times of the nominal voltage; In this case, the concentrator will not be damaged. After the power supply returns to normal, the concentrator will work normally and the data will not be changed.

4.2      Channel and Protocol Types

Table 3 concentrator channel and protocol type table



Concentrator configuration

RS485-I downward

RS485-II upwarddownward

The remote communication


The Mainboard chip





NUC 972



Remote module type

Infrared rate




Upward settable




Other content

Ordinary electric energy meter number

485 total electric energy meter number

PS2 interface debugging

RJ45 debugging

remote upgrade







4.3      Support Electric Energy Meter Types

Currently, the electric energy meter types supported are divided into three types according to the combination of category Numbers 0, 4, 15, small class Numbers 0, specification types DL/ T 645-1997 and DL/ T 645-2007.

5      Appearance and Display

5.1     Appearance and Installation Dimensions

Figure 2. Appearance of the figure and installation of the figure

5.2     Appearance Structure Diagram

Figure3. Appearance schematic diagram of concentrator

5.3   LCD Display of Concentrator

                       The main interface of concentrator is shown in figure 4.

Figure 4 shows the main interface

When the concentrator is installed on the site for the first time after power on, system will be initialized according to the default parameters, but the default parameters may not meet the requirements of the scene at that time, therefore, the user needs to manually set the parameters.

5.3.1 Menu interface

Ø   The top shows the status bar

Show some fixed parameters (not participate in cycle display), such as communication mode, signal strength, abnormal alarm, etc.

Ø   The main display screen

The main display panel data, such as terminal IP, port, etc.

Ø   The bottom shows the status bar

Display the running state of the concentrator, such as task execution status, and the main communication state.

5.3.2 Meanings of each symbol in the top-level menu

Table 5 meanings of each symbol in the top-level menu

Signal strength indicator, the highest is 4grids, the minimum is 1 grid.

When the signal is only 1-2 grids, it means the signal is weak and the communication is not very stable. When the signal intensity is 3-4 grids, the signal is good and the communication is stable.

Communication instructions:

G :means GPRS communication mode

S :means SMS (short message) communication

C :means CDMA communication

L :stands for wired communication

W :stands for radio station communication

Abnormal alarm indication represents an abnormal condition about the concentrator or measurement point. When an exception occurs in the concentrator, the flag will be flashing with the exception event alarm code in turn.


Data of measurement point no. N (values of n range from 0001 to 2048)


The current time

5.3.3 Menu specification instructions

The concentrator display is divided into three types: cycle display mode, key query mode and key setting mode. The key query mode and the key setting mode require the operator to press the button. When the concentrator display is in the cycle display mode, it can enter the key operation mode by pressing any key. In the non-cycle display mode, the concentrator display the main menu interface as shown in figure 5.

                                                            Figure 5 shows the main menu

Selecting the function menu through the key in the main menu, and then enter the corresponding function sub-menu to perform the corresponding operation. When the button is in the corresponding state to stop the button for 1 minute, the concentrator automatically restores the cycle display mode.

    The functional description of each mode is as follows:

1) Cycle display mode

By default, the concentrator, can be displayed on a screen wheel by selecting the content, with a cycle display period of 8 seconds. The default display content contains: master station IP, port, etc. The display mode and display content can be changed at the main station or on site as required.

2) Key query mode

When the concentrator is in roll-show mode, pressing any key to enter the main menu. Then press the corresponding query button to enter the query mode.

When in the key query display mode, you can turn over the screen through the key operation to display all unblocked content. After stopping the button for a minute, the concentrator returns to the original display mode.

3) Key setting mode

When the concentrator is in roll-show mode, press any key to enter the main menu. Then following the settings button to enter the settings mode.

In the display mode of button setting, parameters such as communication parameters with the main station, operation parameters of measurement points, password and time can be set. After stopping the button for a minute, the concentrator returns to the original display mode.

5.3.4 Parameter Setup

The interface for parameter setup and viewing is as shown in figure 6:

Figure6 Interface for parameter setup and viewing

a)      Network communication parameter setup: Through setting up of network parameter, the uplink channel connection is brought about between concentrator and master station.

b)     Users want to modify the concentrator parameters ,first, user need to select item "parameter settings and view" and press "Enter" button and enter the parameter setting options, according to the "communications channel Settings", "electric energy meter parameter Settings", and "concentrator time Settings", "interface password", "concentrator number" ,etc. sub menu items, "concentrator number", for example, according to the Enter button to enter show "administrative area code", and "concentrator address information, then press" Enter button ", can undertake operating, liquid crystal display (LCD) has two, respectively is "scroll" and "setval", select "setval" press "Enter" key after Enteration. At this time if the user has not been through the password authentication LCD prompts "please enter the password" "* * * * * *", then the cursor stays on the first "*", press "up" or "down" button, the bottom of the LCD displays the location can enter Numbers or characters. Press "Left" and "Right" the cursor stays on the next "*" modifications to use, modify completely according to the "Enter" button to enter (initial password: 000000), a display area code modify page, according to the "up" or "down" button to modify the corresponding data, left or right button to change the cursor position, just Enter after modification. Other parameter modification and viewing functions refer to this parameter to view the modification.

The liquid crystal display content is shown in table 6.

Table 6 shows the menu content table

The main menu

1. MP DATA Show

MP 1,

MP 2,

...... ,

MP n.

Positive active power Electrical energy values, reverse active power Electrical energy values.

2. Parameter setting and view



2. Comm Chn Setup

Chn Type SetupComm Mode SetupChn Detail Setup

3. DCU Time Setup

DCU Time Setup

4. Meter Param Setup

MP SelectMeter File Setup

5UI Password Setup

UI Password Setup

3.Terminal Maintain

DCU VerPage SetupSite DebugDCU RestartData InitializeParam InitializeRead MT ManageManual Read MTDCU Data.

5.4      Status Indication

(1)       Above nameplate

Figure 7. Above nameplate on concentrator

Running lamp- running status indicators, red, lamp normally on said concentrator is the main CPU run normally, but did not establish a connection, and Lights 1s off 1s alternately blinking Indicates that the concentrator is operating normally and establishes a connection with the master station.

Alarm lamp-- alarm status indicator, red; The flicker of 1s on the lamp indicates the alarm of concentrator.

RS-485I-- RS-485I communication status indicator, red lamp flashing signal module receiving data; The green lamp flashing indicates the module sends data;

RS-485II-- RS-485II communication status indicator, red lamp flashing indicates the module receives data; The green lamp flashing indicates the module sends data;

Optical communication port -- communication port of infrared and concentrator, communication parameters: 1200, 8, E, 1;

Active power and Reactive power lamp: standby;

(2)       Below nameplate

Figure 8. Below nameplate on concentrator

Ø Local carrier communication module status indicator

Figure 8. Carrier communication module indicator light diagram

Power lamp -- module power indicator light, red, light on the module power on; The lamp out means the module is out of power;

T/R lamp -- module data communication indicator light, red and green. Red light flashing means the module receives data, green light flashing means the module sends data.

A lamp -- A phase send status indicator light, green, light on means the module sends data through this phase;

B lamp – B phase sending status indicator light, green, light on means that the module sends data through this phase;

C lamp - C phase send status indicator light, green, light on means the module send data through this phase.

Ø rem