CN101989932A - RS485-based automatic error detection method - Google Patents
RS485-based automatic error detection method Download PDFInfo
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- CN101989932A CN101989932A CN2009100560411A CN200910056041A CN101989932A CN 101989932 A CN101989932 A CN 101989932A CN 2009100560411 A CN2009100560411 A CN 2009100560411A CN 200910056041 A CN200910056041 A CN 200910056041A CN 101989932 A CN101989932 A CN 101989932A
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Abstract
The invention relates to a RS485-based automatic error detection method, which aims to solve the problems that the fault of a node can lead to the paralysis of the whole system or part of the system generally because an interlinking method of adopting a bus to serially connect nodes by a RS485 is adopted, and because multiple of nodes exist and the action of judging which node makes errors is difficult, in common solutions, the device which causes the errors can be known only through artificially disconnecting devices from the bus one by one, therefore, the detection on the errors needs to spend considerable labor powers and times. In the invention, through the method of sequential detection, whether a device is a failure device is judged by detecting whether the device has a feedback response signal.
Description
Technical field
The present invention relates to communication technique field, particularly relate to a kind of automatic debugging method at the RS485 communication.
Background technology
RS485 sends standard by a kind of balanced type data that the EIA of EIA (Electronic IndustriesAssociation) proposed in nineteen eighty-three, and the transceiver that satisfies this standard adopts balance to send and the differential received working method.In fact, RS485 (TIA/EIA-485) is counted as a kind of expansion of TIA/EIA-422 standard usually.Owing to support multinode (32 or more nodes), remote (maximum 4000 feet) and receive high sensitivity (200mV), when constituting communication network, only need a pair of twisted-pair feeder to make transmission line, therefore with low cost, equipment is simple, has obtained extensive use under multistation, telecommunication environment.
At present, RS-232 is arranged, RS-422, several interface standards of RS-485 are used for serial communication.RS-232 is a serial interface standard the earliest, short distance (＜15M), obtained extensive use in the middle of the low baud rate serial communication.Thereafter short at the communication distance of RS-232 interface standard, the situation that baud rate is lower has proposed the RS-422 interface standard again on the basis of RS-232 interface standard, and the RS-485 interface standard overcomes these defectives.
RS-232 serial ports standard is kind of a single-ended standard that increases communication distance in the low rate serial communication.RS-232 takes uneven transmission means, i.e. single-ended communication.The data-signal of its sending and receiving end is all with respect to earth signal.So its common mode inhibition capacity is poor, add the distributed capacitance of twisted-pair feeder, its transmission range maximum is about 15M, and flank speed is 20KBPS, and it can only the support point point to-point communication.
At the limitation of RS-232 serial ports standard, people have proposed RS-422 again, the RS-485 interface standard.RS-485/422 adopts balance to send with the differential received mode and realizes communication: transmitting terminal becomes differential signal A with the Transistor-Transistor Logic level conversion of signals of serial port, and the output of B two-way is reduced into Transistor-Transistor Logic level signal at receiving terminal with differential signal through after the cable transmission.Because transmission line uses twisted-pair feeder usually, is again differential transfer, so the ability of extremely strong again anti-common mode disturbances, bus transceiver sensitivity is very high, can detect to be low to moderate 200mV voltage.So transmission signals all is to recover outside km.The communication distance of RS-485/422 maximum is about 1219M, and peak transfer rate is 10Mb/S, and transmission rate and transmission range are inversely proportional to, under the transmission rate of 100Kb/S, just can reach maximum communication distance,, need add 485 repeaters if need the longer distance of transmission.RS-485 adopts half-duplex operation, supports multipoint data communication.The general bus type structure that adopts the terminal coupling of RS-485 bus network topology.Promptly adopt a bus that each node is connected in series, do not support annular or Star Network.Use hub-and-spoke configuration if desired, just must use 485 repeaters or 485 hubs just can.General maximum 32 nodes of supporting of RS-485/422 bus if use 485 special chips, can reach 128 or 256 nodes, and maximum can support 400 nodes.
Because it is more flexible that RS485 has long transmission distance, good in anti-interference performance, networking, advantages such as support node is many, in in the past 20 years, RS485 is as a kind of electrical code of multiple spot differential data transmission, be used in many different fields, but be based on the characteristics that a main frame can only be arranged on the RS485 bus-bar, it often is applied between centralized control hinge and the decentralized control unit (as shown in Figure 1).
Because many limitation that RS485 bus-bar itself exists, along with development of science and technology, the bus-bar efficient of RS485 is low, the reliability of communication is low, it is undesirable that the later maintenance cost network engineering is used multiple transmission range, shortcomings such as the node application that single bus-bar can articulate is dumb slowly come out, because RS485 adopts the link method that bus is connected in series each node, usually there is a node to break down and causes entire system or local paralysis, and, because node is many, being difficult to again judge is which node is made mistakes, common solution is manually with equipment disconnection detection on the bus one by one, can know that just which equipment fault causes, maintenance need expend suitable manpower and time like this.
The present invention is just based in order to overcome above-mentioned defective, invented the automatic debug technology of a kind of RS485 bus, the open and close of switch have been utilized, and the cooperation of software, realize the purpose of automatic debug, and do not need to increase extra equipment, economical and easy overcome problems of the prior art.
Summary of the invention
Technical problem to be solved by this invention provides a kind of automatic debugging method based on RS485.To solve problems of the prior art, technical scheme provided by the invention is as follows:
A kind of automatic debugging method based on RS485 is characterized in that comprising the steps:
In the above-mentioned embodiment, equipment D
1-D
nCan be light fixture, each light fixture can be set bright different color, thereby can come the position of failure judgement equipment according to the color of lamp.
Wherein n can get any natural number in principle, but gets 32,128,256,400 etc. usually.
Description of drawings
Fig. 1 is a typical R S485 system schematic.
Fig. 2 is a RS485 debugging system schematic diagram before the present invention starts shooting.
Fig. 3 is the RS485 debugging system schematic diagram that the present invention detects first equipment.
Fig. 4 is the RS485 debugging system schematic diagram that the present invention detects second equipment.
Fig. 5 is the RS485 debugging system schematic diagram that the present invention detects the 3rd equipment.
Fig. 6 is the RS485 debugging system schematic diagram that the present invention detects the 4th equipment.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
After coming out, RS485 signal line slave controller connect n (n is a natural number) platform equipment, n gets 32,128,256,400 etc. usually, present embodiment n gets 5, and the signal front end of each equipment has a switch to control corresponding apparatus more, and inside is then accepted and control appliance by single-chip microcomputer.
Suppose that the 4th equipment is out of order, judge that then it is that the faulty equipment method is as follows:
During system boot, in a period of time, all devices D1-D5 receives ON-and OFF-command before debug work, and as shown in Figure 2, switch S 1-S5 all is in off-state, and at this moment, controller does not send communication signal;
Then, controller is issued orders and is allowed system that the equipment that is connected is done debug action, and once instruction control unit can be sent a broadcasting signal earlier, allows all devices action on this bus, but owing to all switches are disconnected earlier before, have only equipment D1 to move, and all the other equipment all are failure to actuate, at this moment, because equipment D1 does not have fault, it can send a broadcasting signal to controller, does not have fault so that this equipment to be described, as shown in Figure 3.
Simultaneously, switch S 1 closure of equipment D1, the broadcasting signal that controller sends is delivered to equipment D1 and D2, and because the switch of the equipment D3-D5 of back remains closed condition, so can not receive this broadcasting signal, can not move, and this moment, equipment D1 moved, so can not move after receiving broadcasting signal again, had only equipment D2 can receive signal and action, sending a broadcasting signal does not have fault to controller so that this equipment to be described, as shown in Figure 4.
Simultaneously, switch S 2 closures of equipment D2, the broadcasting signal that controller sends is delivered to equipment D1-D3, and because the equipment D4 of back and the switch of D5 remain closed condition, so can not receive this broadcasting signal, can not move, and this moment, equipment D1 and D2 moved, and can not move after therefore receiving broadcasting signal again, had only equipment D3 can receive signal and action, sending a broadcasting signal does not have fault to controller so that this equipment to be described, as shown in Figure 5.
Simultaneously, switch S 3 closures of equipment D3, the broadcasting signal that controller sends is delivered to equipment D1-D4, and because the switch of the equipment D5 of back remains closed condition, so can not receive this broadcasting signal, can not move, and this moment, equipment D1-D3 moved, so can not move after receiving broadcasting signal again, had only equipment D4 can receive signal, and because equipment D4 has fault, when switch S 3 one closures of equipment D3, signal will be disturbed, and promptly this equipment D4 can not respond this broadcasting signal and move, just can learn that equipment D4 is a fault equipment this moment, as shown in Figure 6.
Equipment in the present embodiment can be light fixture equipment, and each light fixture can be set bright different color, thereby can come the position of failure judgement equipment according to the color of lamp.
By the method for above-mentioned automatic debug, can fast and easily judge the faulty equipment in the bus, saved great amount of manpower and material resources, remedied the deficiency in the RS485 communication, for further extensive use RS485 application power has had large increase.
Though the present invention is illustrated hereinbefore according to preferred embodiment of the present invention, this does not represent that protection scope of the present invention is confined to above-mentioned structure, if by structure that claim of the present invention covered all within protection range.Those skilled in the art can be developed the equivalent substitution structure that at an easy rate after reading above-mentioned explanation, and these equivalent alternative structure also are within the scope that this case requires.
Claims (3)
1. the automatic debugging method based on RS485 is characterized in that comprising the steps:
Step 1, during system boot, before debug work in a period of time, all devices D
1-D
nReceive ON-and OFF-command, with those equipment D
1-D
nCorresponding switch S
1-S
nAll be in off-state, at this moment, controller does not send communication signal, and wherein n is a natural number;
Step 2, controller are issued orders and are allowed the equipment D of system to being connected
1-D
nDo debug action, controller is sent a communication signal earlier, allows all devices D on the bus
1-D
nAction, but, have only equipment D1 to move owing to all switches are disconnected earlier in the step 1, and all the other equipment all are failure to actuate, at this moment, if equipment D1 does not have fault, it can send a broadcasting signal to controller, does not have fault so that this equipment D1 to be described, and execution in step three; If equipment D1 does not have broadcasting signal to send, then devices illustrated D1 is a faulty equipment, and debug finishes;
Step 3, controller is given an order, equipment D
I-1Switch S
I-1The communication signal that closure, controller are sent is delivered to equipment D
1-D
i, and because the equipment D of back
I+1The switch of-Dn remains open mode, so can not receive this communication signal, can not move, and this moment equipment D
1-D
I-1Moved, so can not move again after receiving this communication signal, at this moment, if equipment D
iDo not have fault, it can send a broadcasting signal to controller, so that this equipment D to be described
iThere is not fault, i+1 then, and repeat step 3; If equipment D
iThere is not broadcasting signal to send, then devices illustrated D
iBe faulty equipment, debug finishes, wherein 2≤i≤n-1;
Step 4, if preceding n-1 platform equipment does not all break down, then faulty equipment is D
n
2. the automatic debugging method of RS485 as claimed in claim 1, wherein equipment D
1-D
nCan be light fixture, each light fixture can be set bright different color, thereby can come the position of failure judgement equipment according to the color of lamp.
3. the automatic debugging method of RS485 as claimed in claim 2, wherein n≤32.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910056041 CN101989932B (en) | 2009-08-07 | 2009-08-07 | RS485-based automatic error detection method |
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| CN 200910056041 CN101989932B (en) | 2009-08-07 | 2009-08-07 | RS485-based automatic error detection method |
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| CN101989932A true CN101989932A (en) | 2011-03-23 |
| CN101989932B CN101989932B (en) | 2012-12-12 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223275A (en) * | 2011-06-24 | 2011-10-19 | 浙江亚卫通科技有限公司 | Long-distance communication bus |
| CN104104542A (en) * | 2014-07-16 | 2014-10-15 | 深圳市海亿达能源科技股份有限公司 | Real-time intelligent debugging method based on RS485 |
| CN105099506A (en) * | 2015-08-21 | 2015-11-25 | 江阴长仪集团有限公司 | Electric energy meter RS485 communication failure detecting and self-healing device and method |
| CN108508876A (en) * | 2018-05-17 | 2018-09-07 | 合肥威迪变色玻璃有限公司 | A kind of improved daisy chain RS485 control circuits and short-circuit solution |
| US10782760B2 (en) | 2017-05-31 | 2020-09-22 | Canon Kabushiki Kaisha | Electronic device and method of controlling the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2410650Y (en) * | 1999-09-02 | 2000-12-13 | 李志文 | In-phase high voltage measuring device with wire-connecting function |
| CN201051760Y (en) * | 2007-03-30 | 2008-04-23 | 南京汉德森科技股份有限公司 | LED digital intelligent lighting control system |
| CN101420813A (en) * | 2008-11-21 | 2009-04-29 | 浙江大学 | Digital addressable illumination control system and method thereof |
| CN101989941A (en) * | 2009-08-07 | 2011-03-23 | 巨尔(上海)光电照明有限公司 | RS485 bus addressing method |
-
2009
- 2009-08-07 CN CN 200910056041 patent/CN101989932B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223275A (en) * | 2011-06-24 | 2011-10-19 | 浙江亚卫通科技有限公司 | Long-distance communication bus |
| CN102223275B (en) * | 2011-06-24 | 2014-05-07 | 浙江亚卫通科技有限公司 | Long-distance communication bus |
| CN104104542A (en) * | 2014-07-16 | 2014-10-15 | 深圳市海亿达能源科技股份有限公司 | Real-time intelligent debugging method based on RS485 |
| CN104104542B (en) * | 2014-07-16 | 2017-11-03 | 深圳市海亿达能源科技股份有限公司 | A kind of real-time intelligent troubleshooting method based on RS485 |
| CN105099506A (en) * | 2015-08-21 | 2015-11-25 | 江阴长仪集团有限公司 | Electric energy meter RS485 communication failure detecting and self-healing device and method |
| US10782760B2 (en) | 2017-05-31 | 2020-09-22 | Canon Kabushiki Kaisha | Electronic device and method of controlling the same |
| CN108508876A (en) * | 2018-05-17 | 2018-09-07 | 合肥威迪变色玻璃有限公司 | A kind of improved daisy chain RS485 control circuits and short-circuit solution |
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| Publication number | Publication date |
|---|---|
| CN101989932B (en) | 2012-12-12 |
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Effective date of registration: 20170822 Address after: 201108, No. 7, gate 1, 1128 Jin Du Road, Shanghai, Minhang District Co-patentee after: Giant (Kunshan) photoelectric lighting Co., Ltd. Patentee after: Juer (Shanghai) Photoelectric Lighting Co., Ltd. Address before: 201108, 7 floor, building 1128, 3 Jin Du Road, Shanghai, Minhang District Patentee before: Juer (Shanghai) Photoelectric Lighting Co., Ltd. |