CN105656656A - RS485 communication circuit and fault detection method of nodes applying the circuit - Google Patents
RS485 communication circuit and fault detection method of nodes applying the circuit Download PDFInfo
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- CN105656656A CN105656656A CN201410689997.6A CN201410689997A CN105656656A CN 105656656 A CN105656656 A CN 105656656A CN 201410689997 A CN201410689997 A CN 201410689997A CN 105656656 A CN105656656 A CN 105656656A
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Abstract
The invention discloses an RS485 communication circuit. The circuit comprises a microprocessor, a first isolating circuit, a second isolating circuit, a third isolating circuit, a first RS485 transceiver, a second RS485 transceiver, a switching circuit and a switching drive circuit; the microprocessor is respectively connected with one end of the first RS485 transceiver, one end of the second RS485 transceiver and the input end of the switching drive circuit through the first isolating circuit, the second isolating circuit and the third isolating circuit; the output end of the switching drive circuit is connected with the control input end of the switching circuit; and the first breakover end, the second breakover end and the third breakover end of the switching circuit are respectively connected with the other end of the first RS485 transceiver, the other end of the second RS485 transceiver and an RS485 bus. The invention also discloses a fault self-detection method of the RS485 communication circuit and a method for detecting the communication faults of a slave node and a main node applying the RS485 communication circuit. In adoption of the technical solution, the node on the RS485 communication circuit can detect whether there is a fault by itself.
Description
Technical field
The present invention relates to RS485 bus communication technology.
Background technology
As a kind of conventional industrial circle communication bus, RS485 communication is stablized with its communication distance length, communication, wiring is simple and is used widely. But as the communication bus of a master-slave mode, usually require that in bus, all nodes are initial with host node in actual use, to adopting bus topology between most end node and connecting in " handing in hand " mode.
The existing equipment adopting RS485 bus communication, its internal RS485 telecommunication circuit schematic diagram is as shown in Figure 1. This RS485 telecommunication circuit includes microprocessor chip 91, photoelectric isolating circuit 92 and RS485 transponder chip 93. Transistor-Transistor Logic level serial communication and RTS on microprocessor chip 91 control foot of carrying out the coffin upon burial, after being isolated by photoelectric isolating circuit 92, it is connected on the Transistor-Transistor Logic level pin of RS485 transponder chip 93, is converted to A, B differential bus signal by RS485 transponder chip 93, is connected in RS485 bus.
Adopt the equipment of RS485 bus interconnection, its installation site in industrial environment is different, would be likely to occur powerful electromagnetic interference around the position of some equipment or certain section of bus, during these serious interference, can cause that the RS485 transponder chip in the RS485 telecommunication circuit of this equipment is short-circuited the fault of character. Now, can cause that whole network paralysis cannot communicate. And the identification of network paralysis fault and release and be generally required for manual site's investigation, waste time and energy, and be also easy to think some faults of manufacture in troubleshooting procedure.
Summary of the invention
The technical problem to be solved is in that to provide a kind of RS485 telecommunication circuit with fault self-checking function.
Another technical problem to be solved by this invention is in that to provide a kind of method utilizing above-mentioned RS485 telecommunication circuit to carry out fault self-checking.
Another technical problem to be solved by this invention is in that to provide the method detecting communication failure from node and host node adopting above-mentioned RS485 telecommunication circuit.
For solving above-mentioned technical problem, scheme of the present invention is:
The invention provides a kind of RS485 telecommunication circuit, including microprocessor, the first isolation circuit, RS485 transceiver;Microprocessor is connected with one end of a RS485 transceiver by the first isolation circuit; It is characterized in that, this RS485 telecommunication circuit also includes the second isolation circuit, the 2nd RS485 transceiver, switching circuit, the 3rd isolation circuit and switch driving circuit; Microprocessor is connected by one end of the second isolation circuit and the 2nd RS485 transceiver, and is connected with the input of described switch driving circuit by the 3rd isolation circuit, and the outfan of switch driving circuit is connected with the control input of switching circuit; First conduction terminal of switching circuit is connected with the other end of a RS485 transceiver, and the second conduction terminal of switching circuit is connected with the other end of the 2nd RS485 transceiver, and the 3rd conduction terminal of switching circuit is connected with RS485 bus; This switching circuit for being optionally connected to RS485 bus or the other end of the 2nd RS485 transceiver under control of the microprocessor by the other end of a RS485 transceiver.
The method that present invention also offers the above-mentioned RS485 telecommunication circuit self test failure of a kind of use, comprises the following steps:
Microprocessor controls switching circuit, makes a RS485 transceiver and the 2nd RS485 transceiver connect, is formed from loopback circuit;
Microprocessor sends communication message by the second isolation circuit to the 2nd RS485 transceiver, if afterwards by the first isolation circuit from a RS485 transceivers to correct communication message, then judge that this is normal from the transmission path of loopback circuit, if not receiving communication message or the communication message that receives being incorrect, then judge that described transmission path exists fault;
Microprocessor sends communication message by the first isolation circuit to a RS485 transceiver, if afterwards by the second isolation circuit from the 2nd RS485 transceivers to correct communication message, then judge that this is normal from the receiving path of loopback circuit, if not receiving this communication message or the communication message that receives being incorrect, then judge that described receiving path exists fault;
If transmission path and receiving path are all normal, microprocessor judges the oneth RS485 transceiver, the first isolation circuit, the 2nd RS485 transceiver, the second isolation circuit are all working properly.
Present invention also offers a kind of method from nodal test communication failure of RS485 communication network, described includes above-mentioned RS485 telecommunication circuit from node; Should comprise the following steps from the method for nodal test fault:
The communication message on RS485 network is intercepted by this RS485 telecommunication circuit;
If not listening to any communication message meeting framing rule in the given time, then microprocessor starts RS485 telecommunication circuit from loopback test;
If RS485 telecommunication circuit from the result of loopback test be a RS485 transceiver and first isolation circuit all working properly, then microprocessor control switching circuit, make a RS485 transceiver be connected with RS485 bus; If RS485 telecommunication circuit is from the result of loopback test for existing fault, then microprocessor controls switching circuit, makes a RS485 transceiver and the 2nd RS485 transceiver keep connecting.
Present invention also offers a kind of method from nodal test communication failure of RS485 communication network, described includes above-mentioned RS485 telecommunication circuit from node; The method of this host node detection fault comprises the following steps:
All data from node on survey RS485 network are called together by this RS485 telecommunication circuit;
If N continuous polling cycle is not all called together measures any data from node, then microprocessor starts RS485 telecommunication circuit from loopback test;Wherein, N >=1;
If RS485 telecommunication circuit from the result of loopback test be a RS485 transceiver and first isolation circuit all working properly, then microprocessor control switching circuit, make a RS485 transceiver be connected with RS485 bus; If RS485 telecommunication circuit is from the result of loopback test for existing fault, then microprocessor controls switching circuit, makes a RS485 transceiver and the 2nd RS485 transceiver keep connecting.
After adopting technique scheme, whether the node in RS485 bus self-inspection can exist fault. Once break down, it is possible to automatically keep apart bus, it is ensured that in bus, other nodes are unaffected. In addition, node in RS485 bus can also by malfunctioning node information reporting to equipment management personnel hands, changing the situation that original RS485 bus failure needs artificial investigation, processes, substantially increasing the efficiency of detection, thus realizing the remote maintenance of RS485 bus.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of existing RS485 telecommunication circuit.
Fig. 2 is the circuit theory diagrams of RS485 telecommunication circuit according to an embodiment of the invention.
Fig. 3 is the schematic flow sheet of the method from nodal test communication failure of a kind of according to an embodiment of the invention RS485 communication network.
Fig. 4 is the schematic flow sheet of the method for the host node detection communication failure of a kind of according to an embodiment of the invention RS485 communication network.
Detailed description of the invention
Below in conjunction with accompanying drawing the present invention made and describing in further detail.
Refer to Fig. 2. A kind of according to an embodiment of the invention RS485 telecommunication circuit, isolates circuit the 21, the oneth RS485 transceiver 31, second including microprocessor 1, first and isolates circuit the 22, the 2nd RS485 transceiver 32, switching circuit the 4, the 3rd isolation circuit 23 and switch driving circuit 5.
Wherein, microprocessor 1 is connected with one end of a RS485 transceiver 31 by the first isolation circuit 21, isolate circuit 22 by second to be connected with one end of the 2nd RS485 transceiver 32, isolate circuit 23 by the 3rd to be connected with the input of switch driving circuit 5, the outfan of switch driving circuit 5 is connected with the control input of switching circuit 4, is used for driving this switching circuit 4.
First conduction terminal of switching circuit 4 is connected with the other end of a RS485 transceiver 31, and the second conduction terminal of switching circuit 4 is connected with the other end of the 2nd RS485 transceiver 32, and the 3rd conduction terminal of switching circuit 4 is connected with RS485 bus. Switching circuit 4 for being optionally connected to RS485 bus or the other end of the 2nd RS485 transceiver 32 under the control of microprocessor 1 by the other end of a RS485 transceiver 31.
In this RS485 telecommunication circuit, a RS485 transceiver 31 is for communicating with outside RS485 bus, and it is connected with RS485 bus by switching circuit 4 at ordinary times; And the 2nd RS485 transceiver 32 is only used for internal from loopback test, at ordinary times with outside RS485 Bus isolation, form from loopback circuit when RS485 telecommunication circuit is carried out fault detect by needs with a RS485 transceiver 31, therefore itself will not be subject to external action and occur damaging, it also avoid from the abnormal erroneous judgement caused of loopback circuit.
In a specific embodiment, the first above-mentioned isolation circuit 21, second isolates circuit 22 and the 3rd isolation circuit 23 all adopts photoelectric isolating circuit, and switching circuit 4 is made up of switching switch.
The method of above-mentioned RS485 telecommunication circuit detection fault, comprises the following steps:
Microprocessor 1 controls switching circuit 4, makes a RS485 transceiver 31 be connected with the 2nd RS485 transceiver 32, is formed from loopback circuit;
Microprocessor 1 sends communication message by the second isolation circuit 22 to the 2nd RS485 transceiver 32, if have received correct communication message by the first isolation circuit 21 from a RS485 transceiver 31 afterwards, then judge that this is normal from the transmission path of loopback circuit, if not receiving communication message or the communication message that receives being incorrect, then judge that described transmission path exists fault;
Microprocessor 1 sends communication message by the first isolation circuit 21 to a RS485 transceiver 31, if have received correct communication message by the second isolation circuit 22 from the 2nd RS485 transceiver 32 afterwards, then judge that this is normal from the receiving path of loopback circuit, if not receiving this communication message or the communication message that receives being incorrect, then judge that described receiving path exists fault;
If transmission path and receiving path are all normal, it is all working properly that microprocessor judges the oneth RS485 transceiver 31, first isolates circuit the 21, the 2nd RS485 transceiver the 32, second isolation circuit 22.
In above-mentioned method, microprocessor 1 is after judging that RS485 transceiver the 31, first isolation circuit the 21, the 2nd RS485 transceiver the 32, second isolation circuit 22 is working properly, switching circuit 4 can be controlled, a RS485 transceiver 31 is made to be connected with RS485 bus, thus completing the proper communication of recovery and RS485 bus after the test of loopback circuit. As long as and any one judgement when microprocessor 1 in the transmission path coming from loopback circuit or receiving path also exists fault, the state keeping a RS485 transceiver and the 2nd RS485 transceiver to connect can be continued, thus that there is fault, to use this RS485 telecommunication circuit equipment and RS485 Bus isolation being opened.
RS485 bus belongs to the communication bus of " one master and multiple slaves ", and its normal operation depends on each node whether normal operation. Under normal circumstances, each in RS485 communication network has a different address from node, each communication message listened to from node RS485 network, communication message all follows certain framing rule, from the microprocessor in node, the communication message listened to is judged, if the communication message for this address then responds, all nodes on this response message network also can be intercepted and be obtained. The method from nodal test communication failure of the RS485 communication network of the present invention is dependent on above-mentioned principle just. Wherein, aforesaid RS485 telecommunication circuit should be included from node.
Refer to Fig. 3, should comprise the following steps from the method for nodal test fault:
The communication message on RS485 network is intercepted by RS485 telecommunication circuit;
If not listening to any communication message meeting framing rule in the given time, then microprocessor 1 starts RS485 telecommunication circuit from loopback test; Wherein, this RS485 telecommunication circuit comprises the following steps from loopback test: a, microprocessor 1 control switching circuit 4, make a RS485 transceiver 31 be connected with the 2nd RS485 transceiver 32, are formed from loopback circuit; B, microprocessor 1 send communication message by the second isolation circuit 22 to the 2nd RS485 transceiver, if have received correct communication message by the first isolation circuit 21 from a RS485 transceiver 31 afterwards, then judge that this is normal from the transmission path of loopback circuit, if not receiving communication message or the communication message that receives being incorrect, then judge that described transmission path exists fault; C, microprocessor 1 send communication message by the first isolation circuit 21 to a RS485 transceiver 31, if have received correct communication message by the second isolation circuit 22 from the 2nd RS485 transceiver 32 afterwards, then judge that this is normal from the receiving path of loopback circuit, if not receiving this communication message or the communication message that receives being incorrect, then judge that receiving path exists fault;If d transmission path and receiving path are all normal, it is all working properly that microprocessor judges the oneth RS485 transceiver 31, first isolates circuit the 21, the 2nd RS485 transceiver the 32, second isolation circuit 22;
If RS485 telecommunication circuit from the result of loopback test be a RS485 transceiver 31 and the first isolation circuit 21 all working properly, then microprocessor 1 controls switching circuit 4, make a RS485 transceiver 31 be connected with RS485 bus, recover the proper communication with external bus; If RS485 telecommunication circuit is from the result of loopback test for existing fault, then microprocessor 1 controls switching circuit 4, makes a RS485 transceiver 31 keep being connected with the 2nd RS485 transceiver 32, thus should from node and RS485 Bus isolation.
Refer to Fig. 4, the method for this host node detection fault comprises the following steps:
All data from node on survey RS485 network are called together by this RS485 telecommunication circuit;
If N continuous polling cycle is not all called together measures any data from node, then microprocessor 1 starts RS485 telecommunication circuit from loopback test; Wherein, N >=1; N can be 2,3,4 etc. This RS485 telecommunication circuit comprises the following steps from loopback test: a, microprocessor 1 control switching circuit 4, make a RS485 transceiver 31 be connected with the 2nd RS485 transceiver 32, are formed from loopback circuit; B, microprocessor 1 send communication message by the second isolation circuit 22 to the 2nd RS485 transceiver, if have received correct communication message by the first isolation circuit 21 from a RS485 transceiver 31 afterwards, then judge that this is normal from the transmission path of loopback circuit, if not receiving communication message or the communication message that receives being incorrect, then judge that described transmission path exists fault; C, microprocessor 1 send communication message by the first isolation circuit 21 to a RS485 transceiver 31, if have received correct communication message by the second isolation circuit 22 from the 2nd RS485 transceiver 32 afterwards, then judge that this is normal from the receiving path of loopback circuit, if not receiving this communication message or the communication message that receives being incorrect, then judge that receiving path exists fault; If d transmission path and receiving path are all normal, it is all working properly that microprocessor judges the oneth RS485 transceiver 31, first isolates circuit the 21, the 2nd RS485 transceiver the 32, second isolation circuit 22;
If RS485 telecommunication circuit from the result of loopback test be a RS485 transceiver 31 and the first isolation circuit 21 all working properly, then microprocessor controls switching circuit 4, make a RS485 transceiver 31 be connected with RS485 bus, recover the proper communication with external bus; If RS485 telecommunication circuit is from the result of loopback test for existing fault, then microprocessor controls switching circuit 4, makes a RS485 transceiver 31 keep being connected with the 2nd RS485 transceiver 32, thus should from node and RS485 Bus isolation.
Preferably, the method for the host node of above-mentioned a kind of RS485 communication network detection communication failure is further comprising the steps of: if RS485 telecommunication circuit from the result of loopback test for there is fault, then this fault message of the microprocessor records of host node reporting.
Host node can record trouble nodal information automatically, and by communication device (such as the mobile phone etc.) interface etc. of the host node device communication interface with host computer or equipment management personnel, by the malfunctioning node information reporting of RS485 bus. The approximate time that this reporting information includes the archives situation of malfunctioning node, fault occurs, the situation of malfunctioning node can be carried out verifying accurately and processing by related personnel accordingly, and is no longer necessary to loaded down with trivial details field failure investigation.
If from node failure, then through above-mentioned after node failure detection method, that breaks down isolates automatically from node from RS485 network, now, cannot correctly intercepting and respond calling together of host node except fault from node and observe and predict literary composition, other nodes all can realize the proper communication of RS485. In the case, host node namely can determine whether cannot proper communication be malfunctioning node from node, record this malfunctioning node information and report.
Claims (7)
1. a RS485 telecommunication circuit, including microprocessor, the first isolation circuit, RS485 transceiver; Described microprocessor is connected with one end of a RS485 transceiver by the first isolation circuit; It is characterized in that, this RS485 telecommunication circuit also includes the second isolation circuit, the 2nd RS485 transceiver, switching circuit, the 3rd isolation circuit and switch driving circuit;
Described microprocessor is connected with one end of described 2nd RS485 transceiver by the second isolation circuit, and be connected with the input of described switch driving circuit by the 3rd isolation circuit, the outfan of switch driving circuit is connected with the control input of described switching circuit;
First conduction terminal of described switching circuit is connected with the other end of a RS485 transceiver, and the second conduction terminal of switching circuit is connected with the other end of the 2nd RS485 transceiver, and the 3rd conduction terminal of switching circuit is connected with RS485 bus; This switching circuit for being optionally connected to RS485 bus or the other end of the 2nd RS485 transceiver under control of the microprocessor by the other end of a RS485 transceiver.
2. RS485 telecommunication circuit as claimed in claim 1, it is characterised in that described the first isolation circuit, the second isolation circuit and the 3rd are isolated circuit and be photoelectric isolating circuit.
3. the method with the RS485 telecommunication circuit self test failure described in claim 1, it is characterised in that comprise the following steps:
Microprocessor controls switching circuit, makes a RS485 transceiver and the 2nd RS485 transceiver connect, is formed from loopback circuit;
Microprocessor sends communication message by the second isolation circuit to the 2nd RS485 transceiver, if afterwards by the first isolation circuit from a RS485 transceivers to correct communication message, then judge that this is normal from the transmission path of loopback circuit, if not receiving communication message or the communication message that receives being incorrect, then judge that described transmission path exists fault;
Microprocessor sends communication message by the first isolation circuit to a RS485 transceiver, if afterwards by the second isolation circuit from the 2nd RS485 transceivers to correct communication message, then judge that this is normal from the receiving path of loopback circuit, if not receiving this communication message or the communication message that receives being incorrect, then judge that described receiving path exists fault;
If transmission path and receiving path are all normal, microprocessor judges the oneth RS485 transceiver, the first isolation circuit, the 2nd RS485 transceiver, the second isolation circuit are all working properly.
4. the method for RS485 telecommunication circuit self test failure as claimed in claim 3, it is characterized in that, further comprising the steps of: microprocessor is after judging that a RS485 transceiver, the first isolation circuit, the 2nd RS485 transceiver, the second isolation circuit are working properly, control switching circuit, make a RS485 transceiver be connected with RS485 bus.
5. the method from nodal test communication failure of a RS485 communication network, it is characterised in that described includes RS485 telecommunication circuit as claimed in claim 1 from node;
Should comprise the following steps from the method for nodal test fault:
The communication message on RS485 network is intercepted by this RS485 telecommunication circuit;
If not listening to any communication message meeting framing rule in the given time, then microprocessor starts RS485 telecommunication circuit from loopback test;
If RS485 telecommunication circuit from the result of loopback test be a RS485 transceiver and first isolation circuit all working properly, then microprocessor control switching circuit, make a RS485 transceiver be connected with RS485 bus; If RS485 telecommunication circuit is from the result of loopback test for existing fault, then microprocessor controls switching circuit, makes a RS485 transceiver and the 2nd RS485 transceiver keep connecting;
Wherein, described RS485 telecommunication circuit comprises the following steps from loopback test:
Microprocessor controls switching circuit, makes a RS485 transceiver and the 2nd RS485 transceiver connect, is formed from loopback circuit;
Microprocessor sends communication message by the second isolation circuit to the 2nd RS485 transceiver, if afterwards by the first isolation circuit from a RS485 transceivers to correct communication message, then judge that this is normal from the transmission path of loopback circuit, if not receiving communication message or the communication message that receives being incorrect, then judge that described transmission path exists fault;
Microprocessor sends communication message by the first isolation circuit to a RS485 transceiver, if afterwards by the second isolation circuit from the 2nd RS485 transceivers to correct communication message, then judge that this is normal from the receiving path of loopback circuit, if not receiving this communication message or the communication message that receives being incorrect, then judge that described receiving path exists fault;
If transmission path and receiving path are all normal, microprocessor judges the oneth RS485 transceiver, the first isolation circuit, the 2nd RS485 transceiver, the second isolation circuit are all working properly.
6. the method for the host node detection communication failure of a RS485 communication network, it is characterised in that described host node includes RS485 telecommunication circuit as claimed in claim 1;
The method of this host node detection fault comprises the following steps:
All data from node on survey RS485 network are called together by this RS485 telecommunication circuit;
If N continuous polling cycle is not all called together measures any data from node, then microprocessor starts RS485 telecommunication circuit from loopback test; Wherein, N >=1;
If RS485 telecommunication circuit from the result of loopback test be a RS485 transceiver and first isolation circuit all working properly, then microprocessor control switching circuit, make a RS485 transceiver be connected with RS485 bus; If RS485 telecommunication circuit is from the result of loopback test for existing fault, then microprocessor controls switching circuit, makes a RS485 transceiver and the 2nd RS485 transceiver keep connecting;
Wherein, described RS485 telecommunication circuit comprises the following steps from loopback test:
Microprocessor controls switching circuit, makes a RS485 transceiver and the 2nd RS485 transceiver connect, is formed from loopback circuit;
Microprocessor sends communication message by the second isolation circuit to the 2nd RS485 transceiver, if afterwards by the first isolation circuit from a RS485 transceivers to correct communication message, then judge that this is normal from the transmission path of loopback circuit, if not receiving communication message or the communication message that receives being incorrect, then judge that described transmission path exists fault;
Microprocessor sends communication message by the first isolation circuit to a RS485 transceiver, if afterwards by the second isolation circuit from the 2nd RS485 transceivers to correct communication message, then judge that this is normal from the receiving path of loopback circuit, if not receiving this communication message or the communication message that receives being incorrect, then judge that described receiving path exists fault;
If transmission path and receiving path are all normal, microprocessor judges the oneth RS485 transceiver, the first isolation circuit, the 2nd RS485 transceiver, the second isolation circuit are all working properly.
7. the method for the host node detection communication failure of a kind of RS485 communication network as claimed in claim 6, it is characterised in that further comprising the steps of:
If RS485 telecommunication circuit from the result of loopback test for there is fault, then this fault message of the microprocessor records of host node reporting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410689997.6A CN105656656A (en) | 2014-11-26 | 2014-11-26 | RS485 communication circuit and fault detection method of nodes applying the circuit |
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| CN201410689997.6A CN105656656A (en) | 2014-11-26 | 2014-11-26 | RS485 communication circuit and fault detection method of nodes applying the circuit |
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| CN201410689997.6A Pending CN105656656A (en) | 2014-11-26 | 2014-11-26 | RS485 communication circuit and fault detection method of nodes applying the circuit |
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| CN114006835A (en) * | 2021-11-01 | 2022-02-01 | 南京四方亿能电力自动化有限公司 | RS485 communication interface online self-diagnosis system based on specific code element identification technology |
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