CN203070517U - MBUS (meter-bus) main unit device with single slave structure - Google Patents

Abstract

The utility model provides an MBUS (meter-bus) main unit device with a single slave structure. A heat meter is connected to a remote main unit through the MBUS main unit device and an MBUS; the MBUS main unit device comprises a power supply module, a control module, a transmitting and receiving module and a communication switching module, wherein on the one hand, the heat meter is directly communicated with the MBUS of the remote main unit through a normally-closed contact of a communication switch in the communication switching module, and on the other hand, the heat meter is finally communicated with the MBUS of the remote main unit through a normally-open contact of the communication switch in the communication switching module, a receiving circuit module, a controller and a sending circuit module; and the controller is connected with a liquid crystal screen for displaying outputs, a user input device for inputting operation and the communication switching module respectively. By the device, automatic switching of communication between the local MBUS main unit and the heat meter as well as between the remote MBUS main unit and the heat meter can be realized; operation of a user is facilitated; the circuit structure is simple; and the use reliability is high.

Description

A kind of list is from structure MBUS host apparatus

Technical field

The utility model relates to a kind of list from structure MBUS host apparatus, is used for long-distance meter-reading system.

Background technology

In recent years, along with popularizing gradually of hotlist, the MBUS bus also its long-distance meter-reading system application more and more widely.Generally speaking, the hotlist in zone all can be connected to remote host by the MBUS bus, by remote host automatically to the operation of checking meter of all hotlists in this zone.And hotlist itself generally all provides Presentation Function, overhauls in this locality to make things convenient for the user.And the operating mode of some hotlist is more abominable, such as being installed in the pipeline below the road of city of having, some in addition do not had by water logging, under this environment, local operation is very inconvenient.

And MBUS host apparatus of the prior art generally includes receiver module and sending module, receiver module and sending module be ubiquity circuit structure complicated problems not only, and in use also following situation can appear: because hotlist is a kind of current pulse sequence to the data code flow that this device sends, usually use the current value presentation logic " 1 " of 1.5mA, when transmission " 0 ", can make current value increase by 11～20 mA by the control of end instrument terminal, adopt current signal can bring because load (hotlist) changes and influence sampling resistor according to the electric current output of MBUS standard, and then need adjust again to receiving the hardware circuit parameter, therefore making the input signal of receiver module and sending module get output signal is subjected to load effect bigger, and then make the poor reliability of whole device, simultaneously site operation and maintenance are made troubles.

Summary of the invention

The purpose of this utility model provides a kind of list from structure MBUS host apparatus, has realized the automatic switchover of local MBUS main frame and hotlist, far-end MBUS main frame and hotlist communication, in user-friendly, makes circuit structure simple, and dependability is good.

The technical solution of the utility model: a kind of list is from structure MBUS host apparatus, hotlist is connected on the remote host by this MBUS host apparatus and MBUS bus, this MBUS host apparatus comprises supply module, control module, transceiver module and communication handover module, and wherein hotlist leads directly to by the communication change-over switch normally closed contact of communication handover module inside and the MBUS bus of remote host on the one hand; Hotlist finally communicates with the MBUS bus of remote host by communication change-over switch normally opened contact, receiving circuit module, controller and the transtation mission circuit module of communication handover module inside on the other hand, supply module be used for to be given whole device power supply, and controller is connected with the liquid crystal display that is used for showing output action, the user input apparatus and the communication handover module that are used for the operation input action respectively.

This MBUS host apparatus is divided into two kinds of mode of operations: remote host operator scheme and local operation pattern, the switching of two kinds of patterns is as follows: the user not during mode of operation, namely not when this device is enabled user input apparatus, lead directly to by the communication change-over switch normally closed contact of communication handover module inside and the MBUS bus of remote host, this moment, the dormancy of this device was the remote host operator scheme; After the user used user input apparatus, this device wake switched to the local operation pattern with MBUS, simultaneously the hotlist data was being made a copy for to transceiver module power supply, and was showing at liquid crystal display.

Described supply module adopt battery/bus-powered commutation circuit carry out the power supply of local device supplying cell or remote host MBUS bus-powered, when utilizing remote host MBUS bus-powered, the power supply that comes from remote host MBUS bus flows into battery/bus-powered commutation circuit after through rectification circuit and power module I, give controller and the power supply of power module II from the electric energy part that battery/bus-powered commutation circuit flows out by on-off circuit, the power module II is given expansion stream triode and the totalizer power supply in the transtation mission circuit module respectively, give the power supply of power module III from electric energy another part that battery/bus-powered commutation circuit flows out, power module III and then give the power supply of the comparer in the receiving circuit module.

The power supply of this device employing device supplying cell utilizes battery/bus-powered commutation circuit to carry out the local device powered battery or remote host MBUS is bus-powered.Because MBUS is bus-powered to be nonpolarity power supply, so this device need connect rectification circuit when utilizing the power supply of MBUS far-end MBUS is carried out the polarity differentiation for point voltage, d. c. voltage signal after the differentiation carries out the DC-DC transformation by the power module I, equate with device supplying cell voltage after the transformation, flow into battery/bus converting circuit then and wait for that it is the device power supply that controller sends switching signal, on-off circuit is-power supply of power module II, wherein power module is DC-DC transformation module, is used as to expand the power supply of stream triode.The power module III is the DC-DC transforming circuit, and the totalizer that is used as in the transtation mission circuit module provides reference voltage.

Adopt comparer and sampling resistor Rs in the described receiving circuit module.By comparer the voltage on the sampling resistor Rs is compared in real time, when the last electric current of sampling resistor Rs changed, the level of comparer changed; Irrelevant with the load number, because the comparer comparison is this moment and last one constantly level, as long as there is relative electric current variation comparer that the switching of the output state of level is namely arranged; 36V and 24V electricity that bus portion only needs single power supply can realize that the MBUS bus is required are planted level.

Adopt totalizer, operational amplification circuit, expansion stream triode and sampling resistor Rs in the described transtation mission circuit module, the emitter that expands the stream triode is connected to hotlist.Because the use of totalizer, guaranteed that the transtation mission circuit module only uses single power supply, realize the output of 24V or 36V by the totalizer amplifying circuit; Carrying load ability is strong, and load variations does not influence bus level output.

The beneficial effects of the utility model: this device can be placed in actual use apart from the nearer and relative operating mode of hotlist place preferably, can make things convenient for and the hotlist communication, show the hotlist related data, when not using local operation, therefore the direct communication of hotlist and remote host realized the automatic switching function of hotlist and this device and remote host, and whole device circuit is simple, use reliably, can not be subjected to the influence of load.

Description of drawings

Fig. 1 is topological diagram of the present utility model.

Fig. 2 is theory diagram of the present utility model.

Fig. 3 is the schematic diagram of receiving circuit module.

Fig. 4 is the schematic diagram of transtation mission circuit module.

Fig. 5 is the schematic diagram of communication handover module.

Embodiment

As depicted in figs. 1 and 2, a kind of list is from structure MBUS host apparatus, hotlist is connected on the remote host by this MBUS host apparatus and MBUS bus, this MBUS host apparatus comprises supply module, control module, transceiver module and communication handover module, and wherein hotlist leads directly to by communication change-overswitch 13 normally closed contacts of communication handover module inside and the MBUS bus of remote host on the one hand; Hotlist finally communicates with the MBUS bus of remote host by communication change-overswitch 13 normally opened contacts, receiving circuit module 11, controller 10 and the transtation mission circuit module 12 of communication handover module inside on the other hand, supply module be used for to be given whole device power supply, and controller 10 is connected with the liquid crystal display 8 that is used for showing output action, theuser input apparatus 9 and the communication handover module that are used for the operation input action respectively.

Described supply module adopt battery/bus-powered commutation circuit 2 carry out 1 power supply of local device supplying cell or remote host MBUS bus-powered, when utilizing remote host MBUS bus-powered, the power supply that comes from remote host MBUS bus is flowing into battery/bus-powered commutation circuit 2 through rectification circuit 4 and power module I 3 backs, give controller 10 and 5 power supplies of power module II from the electric energy part that battery/bus-powered commutation circuit 2 flows out by on-offcircuit 7, power module II 5 is given expansion stream triode and the totalizer power supply in the transtation mission circuit module 12 respectively, give the power module III 6 power supplies from electric energy another part that battery/bus-powered commutation circuit 2 flows out, power module III 6 and then give the power supply of the comparer in the receiving circuit module 11.

As shown in Figure 3, adopt comparer and sampling resistor Rs in the described receiving circuit module 11.

As shown in Figure 4, adopt totalizer, operational amplification circuit, expansion stream triode and sampling resistor Rs in the described transtation mission circuit module 12, the emitter that expands the stream triode is connected to hotlist.

As shown in Figure 5, communication switching controls module 15 detectsuser input apparatus 9 in real time, judges whether the user has input, if any then by controlling communication change-overswitch 13 communication being switched to this locality, disconnects being electrically connected of hotlist and remote host simultaneously; Communication switching controls module 15 is judged the time that the last operation of user is experienced till now constantly by timing/time set 16, when this time surpasses the setting duration, the communication switching is opened, and 13 switch to remote host, disconnect being electrically connected of local communication simultaneously.

Claims (3)

1. a list is from structure MBUS host apparatus, hotlist is connected on the remote host by this MBUS host apparatus and MBUS bus, it is characterized in that: this MBUS host apparatus comprises supply module, control module, transceiver module and communication handover module, and wherein hotlist leads directly to by communication change-over switch (13) normally closed contact of communication handover module inside and the MBUS bus of remote host on the one hand; Hotlist finally communicates with the MBUS bus of remote host by communication change-over switch (13) normally opened contact, receiving circuit module (11), controller (10) and the transtation mission circuit module (12) of communication handover module inside on the other hand, supply module be used for to be given whole device power supply, and controller (10) is connected with the liquid crystal display (8) that is used for showing output action, the user input apparatus (9) and the communication handover module that are used for the operation input action respectively.

2. a kind of list as claimed in claim 1 is from structure MBUS host apparatus, it is characterized in that: described supply module adopt battery/bus-powered commutation circuit (2) carry out local device supplying cell (1) power supply or remote host MBUS bus-powered, when utilizing remote host MBUS bus-powered, the power supply that comes from remote host MBUS bus is flowing into battery/bus-powered commutation circuit (2) through rectification circuit (4) and power module I (3) back, give controller (10) and power module II (5) power supply from the electric energy part that battery/bus-powered commutation circuit (2) flows out by on-off circuit (7), power module II (5) is given expansion stream triode and the totalizer power supply in the transtation mission circuit module (12) respectively, give power module III (6) power supply from electric energy another part that battery/bus-powered commutation circuit (2) flows out, power module III (6) and then give the power supply of the comparer in the receiving circuit module (11).

3. a kind of list as claimed in claim 1 is characterized in that from structure MBUS host apparatus: adopt comparer and sampling resistor Rs in the described receiving circuit module (11).

4. a kind of list as claimed in claim 1 is characterized in that from structure MBUS host apparatus: adopt totalizer, operational amplification circuit, expansion stream triode and sampling resistor Rs in the described transtation mission circuit module (12), the emitter that expands the stream triode is connected to hotlist.

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