CN105024897A - Scanning method for network equipment on RS485 bus - Google Patents
Scanning method for network equipment on RS485 bus Download PDFInfo
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- CN105024897A CN105024897A CN201410155527.1A CN201410155527A CN105024897A CN 105024897 A CN105024897 A CN 105024897A CN 201410155527 A CN201410155527 A CN 201410155527A CN 105024897 A CN105024897 A CN 105024897A
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Abstract
The invention relates to a scanning method for network equipment on an RS485 bus. The network equipment includes a main control unit and a plurality of remote units. The scanning method includes the following steps: the remote units respectively generate a unique identification number; the main control unit sends a scanning data packet to the RS485 bus, and receives a reply packet from the RS485 bus in a first period of time; after receiving the scanning data packet, each remote unit generates a reply packet, fills in the generated unique identification number in the reply packet, and then sends the reply packet to the RS485 bus; and the main control unit parses the received reply packets, and acquires and stores the unique identification number of each remote unit. The remote units connected to the RS484 bus are identified through the main control unit and the remote units and based on automatic scanning, so that the workload of engineering personnel is reduced greatly.
Description
[technical field]
The present invention relates to the device scan of the RS485 bus broadcast networks such as electric tuning antenna control system, repeater network overlay system, module monitors, more particularly, the method for main control unit in RS485 bus (comprise electrical tilt antenna system centralized control unit or hand held controller, repeater near-end machine or connect the main monitoring of some modules) scanning recognition far-end unit (modules comprising electrical tilt antenna Remote Control Unit, repeater remote termination or be connected with main monitoring) is related to.
[background technology]
In electric tuning antenna control system, centralized control unit (CCU) or hand held controller need to scan through the Remote Control Unit (RCU) that RS485 bus links together, and accurately the RCU intactly scanned in bus is the prerequisite of subsequent query setting operation.
In the network overlay system of repeater, a repeater incoming end (i.e. main frame, or near-end machine) often can be used to coordinate multiple stage capped end (namely from machine, or remote termination) to carry out quorum sensing inhibitor.Before " opening station to report " to network management center, engineering staff needs the device numbering first setting each capped end, guarantees that the connection of incoming end and each capped end is normal.When the capped end number connected in a master-slave system is more, arranging device numbering to separately successively each capped end wastes time and energy.If near-end machine can automatic scan connect capped end number, and for its distributing equipment number, then greatly can reduce the workload of engineering staff.
[summary of the invention]
The object of this invention is to provide the scan method of the network equipment in a kind of RS485 bus, by this scan method, main control unit can automatic scan identification far-end unit, greatly can reduce the workload of engineering staff.
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows:
A scan method for the network equipment in RS485 bus, the described network equipment comprises main control unit and some far-end units, it is characterized in that, described scan method comprises the following steps:
The each self-generating unique identifier of described some far-end units;
Described main control unit sends scan-data bag to described RS485 bus, in first time period, then receive the response packet in described RS485 bus;
Far-end unit generates response packet after receiving described scan-data bag, and the unique identifier that self generates is inserted response packet, is then sent in described RS485 bus;
Described main control unit resolves the response packet received, and obtains and stores the unique identifier of far-end unit.
In order to avoid the situation causing communication failure because of bus collision to greatest extent, in above-mentioned RS485 bus the network equipment scan method in, preferably, also comprise: transmission packet before judge that whether described RS485 bus idle; Start to send packet when described RS485 bus free; And again judge that whether described RS485 bus is idle when described RS485 bus busy waits for a period of time.
In above-mentioned RS485 bus the network equipment scan method in, judge that described RS485 bus is whether idle preferably by following methods: obtain current time; The time interval calculating current time and receive for the last time between packet; When the described time interval is not less than the first set point, judge described RS485 bus free, otherwise judge that described RS485 bus is done.
In above-mentioned RS485 bus the network equipment scan method in, described first set point is preferably relevant to the length of the described message transmission rate of RS485 bus, the number of far-end unit and packet.
In order to avoid the situation causing communication failure because of bus collision to greatest extent, in above-mentioned RS485 bus the network equipment scan method in, preferably, far-end unit waits for one section of random time before sending response packet, and this random time is relevant to the message transmission rate of the far-end unit number in RS485 bus, RS485 bus and the length of response packet.
In above-mentioned RS485 bus the network equipment scan method in, preferably, also comprise: main control unit is resolved after response packet, judges whether response packet collides and whether scan new far-end unit; When response packet collides or scan new far-end unit, scan counter is reset, again send scan-data bag to described RS485 bus, repeat described scanning process; When response packet does not collide and do not scan new far-end unit, scan counter counts; And when the value of scan counter reaches the second set point, terminate scanning.
In above-mentioned RS485 bus the network equipment scan method in, judge whether response packet collides preferably by following methods: detect the beginning flag of response packet, end mark and check results, when beginning flag and end mark are incomplete or check results is incorrect, when judging that this response packet transmits in described RS485 bus, there occurs collision.
In above-mentioned RS485 bus the network equipment scan method in, preferably, also comprise: described main control unit RS485 bus described in transmission scan-data bag forward direction sends initialization package; And after far-end unit receives described initialization package, self is set to zero-address state.
The inventive method is connected to the far-end unit in RS485 bus by main control unit and far-end unit in conjunction with automatic scan identification, therefore, it is possible to greatly reduce the workload of engineering staff.
[accompanying drawing explanation]
Fig. 1 is the flow chart performed by main control unit in preferred embodiment scan method;
Fig. 2 is the flow chart performed by far-end unit in preferred embodiment scan method;
Fig. 3 is the flow chart judging in preferred embodiment scan method that whether RS485 bus is idle;
Fig. 4 is data collision overhaul flow chart in preferred embodiment scan method.
[embodiment]
Below in conjunction with drawings and Examples, the present invention is further described.
In this RS485 bus, the scan method of the network equipment is connected to the far-end unit in RS485 bus by main control unit and far-end unit in conjunction with automatic scan identification, wherein, as shown in Figure 1, the handling process in far-end unit as shown in Figure 2 for handling process in main control unit.
With reference to Fig. 1, the handling process in main control unit comprises:
Step S101, initialization scan number of times (by scan counter COUNT zero setting).Do not arrange in scan counter embodiment at some and namely do not need this step.
Step S102, judges whether to receive scan command.
Step S103, after receiving scan command, sends initialization package to RS485 bus, with all far-end units of initialization, is set to by far-end unit.In some systems, just only under zero-address state far-end unit can respond the scan command that proximal device sent by bus, far-end unit not responding scanning order under other state, in order to have better versatility, so arrange this step S103.
Step S104, judges whether to stop scanning, when the value of scan counter reaches the second set point or receive when terminating scan command, stops scanning.
Step S105, sends a scan-data bag to RS485 bus.
Step S106, at first time period T
recvresponse packet in the described RS485 bus of interior reception.
Step S107, resolves the response packet that receives, obtains and stores the unique identifier of far-end unit.
Step S108, judges whether response packet collides and whether scan new far-end unit.
Step S109, when response packet collides or scan new far-end unit, resets scan counter COUNT, goes to step S104(and namely again sends scan-data bag to described RS485 bus, repeat described scanning process).
Step S110, when response packet does not collide and do not scan new far-end unit, the value of scan counter COUNT adds one, then goes to step S104.
With reference to Fig. 2, the handling process in far-end unit comprises:
Step S201, generates unique identifier (or being sequence number).This unique identifier can use one or more in hardware encoding information, time, random number, adopts certain algorithm to obtain.Such as: minute, second of unique identifier=current time in system and microsecond number sum.In software field, existing a lot of method calculating unique identifier by hardware encoding information, time or random number, such as method generating key etc., these methods all can be applicable to the present invention.
Step S202, when (that is, after receiving described initialization package) after receiving the initialization command from main control unit, is placed in zero-address state by self.
Step S203, generates response packet after receiving the scan-data bag of main control unit, and the unique identifier that self generates is inserted response packet.
Step S204, waits for one section of random time T
rnd, this random time T
rndwith the number N of the far-end unit in RS485 bus
dev, the message transmission rate (i.e. baud rate) of RS485 bus and response packet length relevant.Typically, under the condition that reply data packet length is constant, bus baud rate is higher, sends the packet used time fewer; And far-end unit number is more in bus, the probability of collision is larger, and sending response packet needs the random time of wait also just correspondingly elongated.In certain embodiments, random time T is calculated by the following method
rnd: suppose that the upper limit transmission time of response packet is that 20ms(comprises transmission and program resolution data bag time), then can in order to random number to far-end unit number N
devdelivery, is then multiplied by 20ms as random time T
rnd.
Step S205, is sent to response packet in RS485 bus.
In handling process in said distal ends unit, reduced the situation causing communication failure because of bus collision by step S204.In certain embodiments, can also detect by bus free the situation avoiding to greatest extent causing communication failure because of bus collision, that is: before transmission packet, judge that whether RS485 bus is idle; Start to send packet when RS485 bus free; Again judge that whether RS485 bus is idle when RS485 bus busy waits for a period of time.Fig. 3 shows a kind of bus free testing process.
As shown in Figure 3, this bus free testing process comprises:
Step S301, records time of reception T when receiving packet
pre.
Step S302, obtains current time T when being ready for sending packet
cur.
Step S303, the time interval (T calculating current time and receive for the last time between packet
cur– T
pre).The first set point T is not less than when the described time interval
thr(i.e. T
cur– T
pre>=T
thr) time, judge described RS485 bus free; Otherwise judge that described RS485 bus is done.
Step S304, again obtains current time when RS485 bus busy waits for a period of time, again compares judgement.
The first set point T in above-mentioned steps S303
thrthe preferably Transmission Time Interval Tg of a typical data bag, it is relevant to the length of the message transmission rate of RS485 bus, the number of far-end unit and packet.First set point T
thralso can be the fixed value rule of thumb set.Suppose that Bus Speed is 9600bps, there are 16 far-end units, reply data packet length is fixed as 24 bytes, then transmit each packets need 20 milliseconds, because each far-end unit arranges random delay when sending response packet, and the scanning bag of no longer answer bus after successful respond scanning bag, the probability of rear collision is more and more less, according to far-end unit number, can by the first set point T
thrbe set as 80 milliseconds.First set point T
thrtoo large or too little all bad, too conference causes far-end unit transmission response packet wait for too for a long time and then cause scan operation consuming time too of a specified duration; Too littlely can strengthen response packet collision probability, cause repeatedly sending scanning bag.
As shown in Figure 4, at above-mentioned steps S108, judge whether response packet collides by the following method:
Step S401, carries out data splicing, analysis after receiving packet.
Step S402, detects beginning flag and the end mark of response packet, there occurs collision when not full-time this response packet of judgement of beginning flag and end mark transmits in RS485 bus.
Step S403, when the check results of response packet is incorrect, there occurs collision when judging that this response packet transmits in RS485 bus.
Below detailed description is compared to invention has been in conjunction with specific embodiments; but these specific descriptions should not be construed as limiting the scope of the invention; those skilled in the art can also carry out modifying or being equal to replacing according to explanation of the present invention, and protection scope of the present invention is as the criterion with claims.
Claims (8)
1. the scan method of the network equipment in RS485 bus, the described network equipment comprises main control unit and some far-end units, it is characterized in that, described scan method comprises the following steps:
The each self-generating unique identifier of described some far-end units;
Described main control unit sends scan-data bag to described RS485 bus, in first time period, then receive the response packet in described RS485 bus;
Far-end unit generates response packet after receiving described scan-data bag, and the unique identifier that self generates is inserted response packet, is then sent in described RS485 bus;
Described main control unit resolves the response packet received, and obtains and stores the unique identifier of far-end unit.
2. the scan method of the network equipment in RS485 bus according to claim 1, it is characterized in that, described scan method also comprises:
Before transmission packet, judge that whether described RS485 bus is idle;
Start to send packet when described RS485 bus free; And
Again judge that whether described RS485 bus is idle when described RS485 bus busy waits for a period of time.
3. the scan method of the network equipment in RS485 bus according to claim 2, is characterized in that, judges whether idle method comprises described RS485 bus:
Obtain current time;
The time interval calculating current time and receive for the last time between packet;
When the described time interval is not less than the first set point, judge described RS485 bus free, otherwise judge that described RS485 bus is done.
4. the scan method of the network equipment in RS485 bus according to claim 3, it is characterized in that, described first set point is relevant to the length of the described message transmission rate of RS485 bus, the number of far-end unit and packet.
5. the scan method of the network equipment in RS485 bus according to claim 1, it is characterized in that, far-end unit waits for one section of random time before sending response packet, and this random time is relevant to the message transmission rate of the far-end unit number in RS485 bus, RS485 bus and the length of response packet.
6. the scan method of the network equipment in RS485 bus according to claim 1, it is characterized in that, described scan method also comprises:
Main control unit judges whether response packet collides and whether scan new far-end unit after resolving response packet;
When response packet collides or scan new far-end unit, scan counter is reset, again send scan-data bag to described RS485 bus, repeat described scanning process;
When response packet does not collide and do not scan new far-end unit, scan counter counts; And
When the value of scan counter reaches the second set point, terminate scanning.
7. the scan method of the network equipment in RS485 bus according to claim 6, it is characterized in that, judge that the method whether response packet collides is: detect the beginning flag of response packet, end mark and check results, when beginning flag and end mark are incomplete or check results is incorrect, when judging that this response packet transmits in described RS485 bus, there occurs collision.
8. the scan method of the network equipment in RS485 bus according to claim 1, it is characterized in that, described scan method also comprises:
Described main control unit RS485 bus described in transmission scan-data bag forward direction sends initialization package; And
After far-end unit receives described initialization package, self is set to zero-address state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410155527.1A CN105024897A (en) | 2014-04-17 | 2014-04-17 | Scanning method for network equipment on RS485 bus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410155527.1A CN105024897A (en) | 2014-04-17 | 2014-04-17 | Scanning method for network equipment on RS485 bus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106021148A (en) * | 2016-05-12 | 2016-10-12 | 深圳市兴源智能仪表股份有限公司 | Automatic search method for communication address of bus equipment |
| CN107360180A (en) * | 2017-08-01 | 2017-11-17 | 上海斐讯数据通信技术有限公司 | A kind of portal authentication method and system based on radio reception device monitoring |
| CN112888063A (en) * | 2021-03-02 | 2021-06-01 | 三维通信股份有限公司 | Remote terminal network access method, system, electronic device and storage medium |
| CN113543202A (en) * | 2021-07-29 | 2021-10-22 | 陕西天基通信科技有限责任公司 | Method and system for reporting SN (serial number) |
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| CN101163075A (en) * | 2006-10-10 | 2008-04-16 | 中兴通讯股份有限公司 | Method of implementing embedded device address installation by RS 485 bus competition |
| CN101626581A (en) * | 2008-07-08 | 2010-01-13 | 中国移动通信集团公司 | Method, device and system for scanning equipment in electrically adjustable antenna interface |
| CN101888018A (en) * | 2009-05-14 | 2010-11-17 | 中兴通讯股份有限公司 | Electric tilt antenna control device |
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2014
- 2014-04-17 CN CN201410155527.1A patent/CN105024897A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101163075A (en) * | 2006-10-10 | 2008-04-16 | 中兴通讯股份有限公司 | Method of implementing embedded device address installation by RS 485 bus competition |
| CN101626581A (en) * | 2008-07-08 | 2010-01-13 | 中国移动通信集团公司 | Method, device and system for scanning equipment in electrically adjustable antenna interface |
| CN101888018A (en) * | 2009-05-14 | 2010-11-17 | 中兴通讯股份有限公司 | Electric tilt antenna control device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106021148A (en) * | 2016-05-12 | 2016-10-12 | 深圳市兴源智能仪表股份有限公司 | Automatic search method for communication address of bus equipment |
| CN107360180A (en) * | 2017-08-01 | 2017-11-17 | 上海斐讯数据通信技术有限公司 | A kind of portal authentication method and system based on radio reception device monitoring |
| CN112888063A (en) * | 2021-03-02 | 2021-06-01 | 三维通信股份有限公司 | Remote terminal network access method, system, electronic device and storage medium |
| CN113543202A (en) * | 2021-07-29 | 2021-10-22 | 陕西天基通信科技有限责任公司 | Method and system for reporting SN (serial number) |
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Application publication date: 20151104 |