CN102223275A - Long-distance communication bus - Google Patents
Long-distance communication bus Download PDFInfo
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- CN102223275A CN102223275A CN2011101724204A CN201110172420A CN102223275A CN 102223275 A CN102223275 A CN 102223275A CN 2011101724204 A CN2011101724204 A CN 2011101724204A CN 201110172420 A CN201110172420 A CN 201110172420A CN 102223275 A CN102223275 A CN 102223275A
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Abstract
The invention provides a long-distance communication bus, comprising a bus transceiving module, relay communication modules and 485 communication modules, wherein the bus transceiving module comprises a microprocessor circuit as well as an RS485 serial communication interface circuit and an RS-232 serial communication interface circuit which are respectively connected with the microprocessor circuit; each relay communication module comprises a relay microprocessor circuit as well as an uplink and a downlink RS485 serial communication interface circuits which are respectively connected with the relay microprocessor circuit; each 485 communication module comprises a terminal microprocessor circuit and a terminal RS485 serial communication interface circuit connected with the terminal microprocessor circuit; the relay communication module in a first group is connected with the bus transceiving module, and the relay communication module in a last group is connected with the relay communication module in a next group; and the relay communication module in each group is respectively connected with not more than seven groups of the 485 communication modules in parallel. The long-distance communication bus has the advantages of long communication distance, small delay, low equipment manufacturing cost and high reliability.
Description
Technical field
The present invention relates to a kind of communication bus, specifically, related to a kind of telecommunication bus.
Background technology
Communication as the safety-protection system of the security protection of railway border, airport circumference security protection, military base circumference security protection etc. has following characteristics: communication distance is long, from several kilometers to the hundreds of kilometer; Communicating terminal is many, and every km needs a security protection main frame, and a security protection main frame has a communicating terminal module usually, will be with several to a hundreds of communicating terminal module on the communication line usually; Traffic is little, does not have communication on the communication line at ordinary times, just has information toward center monitoring chamber biography when certain defence area has invasion or night watching personnel to pass by; The requirement transmission delay is little, generally should be not more than 3 seconds; Cost is low.
In the prior art, telecommunication mode commonly used has two kinds: a kind of is radio communication, and a kind of is optical fiber communication, and their common characteristic are that the transmission data volume is big, speed is high; But the cost of optical fiber communication is higher, and especially communication has when much layouting on the way, and its cost is higher; Though the radio communication cost is lower, but because of radio communication can only be a point-to-point communication, when a plurality of layouting being arranged on the way for communication, it must communicate with the relay mode, in case layout more for a long time, very big communication delay will be caused, secondly, Wireless Management Committee is very tight to the frequency range management, transmitting power can not be excessive, and can only use amateur band, use the equipment of this frequency range many will be easy to cause interference, moreover, at the thunder and lightning sleety weather, radio communication is interrupted, therefore, though the radio communication cost is low, but a kind of communication mode not too reliably.
At present, comparatively Chang Yong wire communication mode also has CAN bus and 485 buses, and the communication distance of CAN bus is no more than 1km generally speaking, and the communication distance of 485 buses is generally speaking also all about 1km.
Therefore, on the communication line that reaches the hundreds of kilometer, arrange a hundreds of communicating terminal module and reliable, the real-time communication of energy, also do not have a kind of communication mode more reasonably to realize at present; In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, thereby the telecommunication that a kind of communication distance is far away, communication delay is little, communication apparatus is simple, cost is low, reliability is high bus is provided.
To achieve these goals, the technical solution adopted in the present invention is: a kind of telecommunication bus, and it comprises the bus transceiver module, is not more than 30 groups of trunking traffic modules that are connected in series and is not more than 218 groups 485 communication modules; Wherein, described bus transceiver module comprises microcontroller circuit, RS485 serial communication interface circuit and RS-232 serial communication interface circuit, and described RS485 serial communication interface circuit is connected described microcontroller circuit respectively with described RS-232 serial communication interface circuit; Described trunking traffic module comprises relaying microcontroller circuit, up RS485 serial communication interface circuit and descending RS485 serial communication interface circuit, and described up RS485 serial communication interface circuit is connected described relaying microcontroller circuit respectively with described descending RS485 serial communication interface circuit; Described 485 communication modules comprise terminal microprocessor circuit and the terminal RS485 serial communication interface circuit that is connected described terminal microprocessor circuit; The up RS485 serial communication interface circuit of first group of trunking traffic module connects the RS485 serial communication interface circuit of described bus transceiver module, and the descending RS485 serial communication interface circuit of last one group of trunking traffic module connects the up RS485 serial communication interface circuit of next group trunking traffic module; The descending RS485 serial communication interface circuit of every group of described trunking traffic module is connected in parallel with the terminal RS485 serial communication interface circuit that is not more than seven groups described 485 communication modules respectively.
Based on above-mentioned, the RS485 serial communication interface circuit of described bus transceiver module is connected in parallel with the terminal RS485 serial communication interface circuit that is not more than eight groups described 485 communication modules respectively.
Based on above-mentioned, it also comprises communication computer, and the RS-232 serial communication interface circuit of described bus transceiver module is connected with described communication computer.
The relative prior art of the present invention has outstanding substantive distinguishing features and marked improvement, specifically, this telecommunication bus is used common twisted-pair feeder communication, and adopt bus mode to connect each communication module, communication distance can reach about 248km, and maximum communication postpones to be no more than 2 seconds, and it is a communication distance communication bus farthest in the present bus communication mode, and it has the outstanding advantage that communication distance is far away, communication delay is little, communication apparatus is simple, cost is low, reliability is high.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is the electrical block diagram of bus transceiver module of the present invention.
Fig. 3 is the electrical block diagram of trunking traffic module of the present invention.
Fig. 4 is the electrical block diagram of 485 communication modules of the present invention.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
As shown in Figure 1, a kind of telecommunication bus, it comprises 485 communication modules of a communication computer, one group of bus transceiver module, 30 groups of trunking traffic modules that are connected in series and 218 groups; Wherein, described bus transceiver module comprises microcontroller circuit, RS485 serial communication interface circuit and RS-232 serial communication interface circuit, and described RS485 serial communication interface circuit is connected described microcontroller circuit respectively with described RS-232 serial communication interface circuit; Described trunking traffic module comprises relaying microcontroller circuit, up RS485 serial communication interface circuit and descending RS485 serial communication interface circuit, and described up RS485 serial communication interface circuit is connected described relaying microcontroller circuit respectively with described descending RS485 serial communication interface circuit; Described 485 communication modules comprise terminal microprocessor circuit and the terminal RS485 serial communication interface circuit that is connected described terminal microprocessor circuit; The RS-232 serial communication interface circuit of described bus transceiver module is connected with described communication computer; The up RS485 serial communication interface circuit of first group of trunking traffic module connects the RS485 serial communication interface circuit of described bus transceiver module; The descending RS485 serial communication interface circuit of first group of trunking traffic module connects the up RS485 serial communication interface circuit of second group of trunking traffic module, the descending RS485 serial communication interface circuit of second group of trunking traffic module connects the up RS485 serial communication interface circuit of the 3rd group of trunking traffic module, by that analogy, to realize that 30 groups trunking traffic module is connected in series; The descending RS485 serial communication interface circuit of every group of described trunking traffic module is connected in parallel with the terminal RS485 serial communication interface circuit of seven groups described 485 communication modules respectively; The RS485 serial communication interface circuit of described bus transceiver module is connected in parallel with the terminal RS485 serial communication interface circuit of eight groups described 485 communication modules respectively.
Present embodiment in actual applications, 30 groups of trunking traffic modules that are connected in series and corresponding with it 218 groups 485 communication modules are according to annexation spaced apart in regular turn, and the distance between described 485 communication modules of two adjacent groups should be not more than 1km, and the distance between the described trunking traffic module of two adjacent groups should be not more than 8km; Wherein, described bus transceiver module is connected in parallel with corresponding eight groups of described 485 communication modules respectively, constitutes first communication set with this; First group of described trunking traffic module is connected in parallel with corresponding seven groups of described 485 communication modules respectively, and is connected with described bus transceiver module, constitutes the second communication group with this; Second group of described trunking traffic module is connected in parallel with corresponding seven groups of described 485 communication modules respectively, and be connected with first group of described trunking traffic module, constitute the second communication group with this, by that analogy, the 30 group of described trunking traffic module is connected in parallel with corresponding seven groups of described 485 communication modules respectively, and be connected with the 29 group of described trunking traffic module, constitute the 31 communication set with this; That is, 485 communication modules of 30 groups of trunking traffic modules that are connected in series and 218 groups are evenly distributed on the communication line, and constitute 31 communication set, and the communication distance of each communication set can reach 8km, and total communication distance can reach 248km.
This telecommunication bus is the half-duplex operation mode, and promptly the time receiving can not be sent out, can not be received when sending out; All communications all are to carry out with master slave relation, promptly, bus transceiver module, trunking traffic module respectively and each self-corresponding 485 communication module, next group trunking traffic module form communication set, they are the main frame of 485 communication modules and next group trunking traffic module in the communication set separately, next group trunking traffic module is again the slave of last one group of trunking traffic module, and 485 all communication modules all are the interior slaves of communication set separately.
All main frames all are to send and receive information in cycle with 50ms to slave, and all slaves all are in accepting state, wait to receive after the information of main frame that immediately the information with oneself sends to main frame; The every 200ms of all trunking traffic modules changes host mode into the slave mode once, mails to last one group of trunking traffic module with the information that receives last one group of trunking traffic module and with information of this group and next group trunking traffic module; Therefore, the transmitting-receiving of 248km postpones to be to the maximum 50ms*30=1500ms.
Of particular note, if based on principle of the present invention, increase communication set or expanding communication group again, the address will be increased, Frame length will extend, and finally causes call duration time to postpone greatly, and this will be difficult to satisfy the primary demand of communication; Also just be based on this, the present invention should be the preferred technique scheme.
As shown in Figure 2, described bus transceiver module comprises microcontroller circuit, RS485 serial communication interface circuit and RS-232 serial communication interface circuit, and described RS485 serial communication interface circuit is connected described microcontroller circuit respectively with described RS-232 serial communication interface circuit; Specifically, single-chip microcomputer connects RS485 serial communication interface circuit and RS-232 serial communication interface circuit respectively, wherein, the RS485 serial communication interface circuit is realized communicating by letter with eight group of 485 communication module with first group of trunking traffic module, and the RS-232 serial communication interface circuit is realized communicating by letter with communication computer; RS485 serial communication interface circuit and RS-232 serial communication interface circuit are all very common, no longer further give unnecessary details.
As shown in Figure 3, described trunking traffic module comprises relaying microcontroller circuit, up RS485 serial communication interface circuit and descending RS485 serial communication interface circuit, and described up RS485 serial communication interface circuit is connected described relaying microcontroller circuit respectively with described descending RS485 serial communication interface circuit; Specifically, single-chip microcomputer links to each other with two 485 isolators, and two 485 spacer structures are identical, one of them as last one group of trunking traffic module from mouth, another is as main mouthful of next group trunking traffic module and 485 communication modules; Be example with one of them 485 isolator below, introduce its operation principle: the information that receive, under the pin 2 effective situations of 485 interface chips, be P3.4=0, at this moment, by the pin 1 of 485 interface chips, the serial ports that information can be delivered to single-chip microcomputer through photoelectricity isolated tube 6N137,74HC125 receives on the pin; The information that sends can send pin by 74HC125, deliver on the transmission pin D of 485 interface chips through photoelectricity isolated tube 6N137 by single-chip microcomputer again, and under the effective situation of pin DE, transmission information is sent on 485 buses by 485 interface chips; This circuit key is being isolated.
As shown in Figure 4, described 485 communication modules comprise terminal microprocessor circuit and the terminal RS485 serial communication interface circuit that is connected described terminal microprocessor circuit; Specifically, single-chip microcomputer links to each other with one 485 isolator, 485 isolators as corresponding with it trunking traffic module from mouth.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (3)
1. telecommunication bus, it is characterized in that: it comprises the bus transceiver module, is not more than 30 groups of trunking traffic modules that are connected in series and is not more than 218 groups 485 communication modules; Wherein, described bus transceiver module comprises microcontroller circuit, RS485 serial communication interface circuit and RS-232 serial communication interface circuit, and described RS485 serial communication interface circuit is connected described microcontroller circuit respectively with described RS-232 serial communication interface circuit; Described trunking traffic module comprises relaying microcontroller circuit, up RS485 serial communication interface circuit and descending RS485 serial communication interface circuit, and described up RS485 serial communication interface circuit is connected described relaying microcontroller circuit respectively with described descending RS485 serial communication interface circuit; Described 485 communication modules comprise terminal microprocessor circuit and the terminal RS485 serial communication interface circuit that is connected described terminal microprocessor circuit; The up RS485 serial communication interface circuit of first group of trunking traffic module connects the RS485 serial communication interface circuit of described bus transceiver module, and the descending RS485 serial communication interface circuit of last one group of trunking traffic module connects the up RS485 serial communication interface circuit of next group trunking traffic module; The descending RS485 serial communication interface circuit of every group of described trunking traffic module is connected in parallel with the terminal RS485 serial communication interface circuit that is not more than seven groups described 485 communication modules respectively.
2. telecommunication bus according to claim 1 is characterized in that: the RS485 serial communication interface circuit of described bus transceiver module is connected in parallel with the terminal RS485 serial communication interface circuit that is not more than eight groups described 485 communication modules respectively.
3. telecommunication bus according to claim 1 and 2 is characterized in that: it also comprises communication computer, and the RS-232 serial communication interface circuit of described bus transceiver module is connected with described communication computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110172420.4A CN102223275B (en) | 2011-06-24 | 2011-06-24 | Long-distance communication bus |
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| CN201110172420.4A CN102223275B (en) | 2011-06-24 | 2011-06-24 | Long-distance communication bus |
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| CN102223275A true CN102223275A (en) | 2011-10-19 |
| CN102223275B CN102223275B (en) | 2014-05-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932222A (en) * | 2012-10-15 | 2013-02-13 | 南京富岛信息工程有限公司 | Communication converter supporting recommended standard (RS) 485 and Modbus multi-master station data acquisition |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2622940Y (en) * | 2002-11-01 | 2004-06-30 | 深圳市优联宽带网络科技有限公司 | Optical fiber transceiver module data checking network management appts. |
| CN201628861U (en) * | 2010-03-12 | 2010-11-10 | 成都安可信电子股份有限公司 | Bus transmission system |
| CN101989932A (en) * | 2009-08-07 | 2011-03-23 | 巨尔(上海)光电照明有限公司 | RS485-based automatic error detection method |
-
2011
- 2011-06-24 CN CN201110172420.4A patent/CN102223275B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2622940Y (en) * | 2002-11-01 | 2004-06-30 | 深圳市优联宽带网络科技有限公司 | Optical fiber transceiver module data checking network management appts. |
| CN101989932A (en) * | 2009-08-07 | 2011-03-23 | 巨尔(上海)光电照明有限公司 | RS485-based automatic error detection method |
| CN201628861U (en) * | 2010-03-12 | 2010-11-10 | 成都安可信电子股份有限公司 | Bus transmission system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932222A (en) * | 2012-10-15 | 2013-02-13 | 南京富岛信息工程有限公司 | Communication converter supporting recommended standard (RS) 485 and Modbus multi-master station data acquisition |
| CN102932222B (en) * | 2012-10-15 | 2016-05-04 | 南京富岛信息工程有限公司 | Support the communication converter of many main websites of RS485&Modbus data acquisition |
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| CN102223275B (en) | 2014-05-07 |
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