CN102158382A - RS485 star-shaped bus system - Google Patents
RS485 star-shaped bus system Download PDFInfo
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- CN102158382A CN102158382A CN2011100616077A CN201110061607A CN102158382A CN 102158382 A CN102158382 A CN 102158382A CN 2011100616077 A CN2011100616077 A CN 2011100616077A CN 201110061607 A CN201110061607 A CN 201110061607A CN 102158382 A CN102158382 A CN 102158382A
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Abstract
The invention discloses an RS485 star-shaped bus system. The RS485 star-shaped bus system comprises an RS485 star-shaped hub as well as a host computer and a plurality of slave computers which are connected with the star-shaped hub. The RS485 star-shaped bus system is characterized in that the RS485 star-shaped hub is equipped with an RS232 serial port and 1-32 pairs of RS485 bus interfaces, wherein, the RS232 serial port is connected with the host computer; the RS485 bus interfaces are connected with the slave computers; and each pair of the RS485 bus interfaces are connected with a pair of the slave computers in a pairing manner. The RS485 star-shaped bus system supports arbitrary star topology connection network structures, and a fault on each salve computer does not affect normal operation of the other salve computers.
Description
[technical field]
The present invention relates to electronic information technical field, relate to a kind of communication bus system in particular.
[background technology]
The RS-485 bus is a kind of half-duplex operation bus of industry spot extensive use, the RS-485 bus is a main website to the single-point of slave station to multidrop network, the RS-485 bus couples together on-the-spot all RS-485 equipment with bus type structure from the beginning to the end by a pair of twisted-pair feeder, constitutes an on-scene communication bus.Common various RS-485 is distributed on the main line of bus mutually from machine equipment, and just the main line of RS-485 bus should be zero to the connecting line distance of each slave appliance terminal; But in actual field is used, be difficult to a bus all devices be coupled together, field apparatus is star-like, radial pattern bifurcated or the distribution of branch type mostly.
[summary of the invention]
The objective of the invention is at the deficiencies in the prior art, a kind of RS485 star bus system is provided, support any star topology to connect network configuration, the fault of each slave can not influence other slave operate as normal.
To achieve these goals, the present invention proposes a kind of RS485 star bus system, include a star-like hub 1 of RS485, a main frame 3, a plurality of slaves 2, first circuit 41 and second circuit 42, it is characterized in that: the star-like hub 1 of described RS485 is provided with a RS232 serial ports 12 and 32 pairs of RS485 bus interface 11, described RS232 serial ports 12 is connected to main frame 3 by first circuit 41, each is connected with a pair of slave 2 pairings simultaneously to RS485 bus interface 11, and when described slave 2 numbers are odd number, last connects a slave 2 to 11 of RS485 bus interface, each communication distance to the slave 2 that RS485 bus interface 11 connects is not more than 1200m, described main frame 3 adopts each slave 2 of half-duplex mode poll, and control the communication direction of the star-like hub 1 of RS485 by the RTS (Request-To-Send) of RS232 serial ports 12, it is the structure of twisted-pair feeder with anti-surge device 14, the second circuits 42 that each RS485 bus interface 11 is provided with lightning protection device 13.
Above-mentioned RS485 star bus system, wherein RS485 bus interface 11 is preferably the RJ45 interface.
The beneficial effect that the present invention adopts above technical scheme to reach is:
1. the present invention adopts unique zero-lag transmission and the two-way handoff technique of standard, can transparent compatibility and support upper-layer protocol such as any RS-485 poll, and support any star topology to connect network configuration, applied range, networking cost are low.
2. RS485 bus interface of the present invention 11 adopts lightning protection and anti-surge protection design, can anti lightning disturbs and antistatic the equipment burnout that the while can avoid the earth potential difference of different slaves to cause.
[description of drawings]
The reader will become apparent various aspects of the present invention after the reference accompanying drawing is read the specific embodiment of the present invention.Simultaneously,, be intended to express the implication with the relevant structure of feature of the present invention, also do not need according to the complete drafting of actual size, formerly statement with the accompanying drawing that is hereinafter contrasted.
Accompanying drawing 1 is an Organization Chart of the present invention.
Accompanying drawing 2 is the structural representation of the star-like hub of RS485 of the present invention.
[description of symbols in the accompanying drawing]
The star-like hub 1 of RS485
Slave 2
RS485 bus interface 11
Upstream data indicator light 16
Downlink data indicator light 17
[embodiment]
For further setting forth 26S Proteasome Structure and Function of the present invention, the present invention is elaborated below in conjunction with accompanying drawing and preferred embodiment:
As shown in Figure 1, the invention provides a kind of RS485 star bus system, include the star-like hub of RS485 1, main frame 3, a plurality of slave 2, first circuit 41 and second circuit 42, the star-like hub 1 of described RS485 is provided with a RS232 serial ports 12 and 32 pairs of RS485 bus interface 11, described RS232 serial ports 12 is connected with main frame 3 by first circuit 41, described RS485 bus interface 11 is connected with the slave interface 21 of slave 2 by second circuit 42, and each RS485 bus interface 11 is provided with lightning protection device 13 and anti-surge device 14.
Please refer to Fig. 2, on the star-like hub 1 of RS485, have a RS232 serial ports 12 and 32 pairs of RS485 bus interface 11, each is corresponding up and down to RS485 bus interface 11 and arranges, more be provided with upstream data indicator light 16 and downlink data indicator light 17 on the panel of the star-like hub 1 of RS485, other has a power supply indicator 15.Each is connected with a pair of slave 2 pairings by second circuit 42 RS485 bus interface 11, when if slave 2 numbers are odd number, last connects a star-like hub 1 of slave 2 these RS485 to 11 of RS485 bus interface and is connected with main frame 3 by first circuit 41 by RS232 serial ports 12, and second circuit 42 is preferably the structure of twisted-pair feeder.
The main frame 3 of RS485 star bus of the present invention system is preferably PC, adopt each slave 2 of half-duplex mode poll, main frame 3 is by the communication direction of the star-like hub 1 of RTS control RS485 of RS232 serial ports 12, and main frame 3 enables RTS when receiving data, decapacitation RTS when main frame 3 sends data.Each second circuit 42 will adopt a pair of twisted-pair feeder, guarantees transmission range.RS485 bus interface 11 adopts the RJ45 interface, and 1 and 2 pin are A and the B line of RS485.Transfer of data is supported various universal asynchronous receiving-transmitting transmission (UART) frame formats, and baud rate is supported 115200bps.
Below only being preferred embodiment of the present invention, is not in order to limit the interest field of the present patent application; Simultaneously above the description for those of ordinary skills should understand and implement, so other does not break away from the equivalence of being finished under the disclosed spirit and change or modify, and all should be contained in the scope of claims.
Claims (3)
1. a RS485 star bus system includes a star-like hub of RS485, main frame, a plurality of slave, first circuit and second circuit, it is characterized in that:
The star-like hub of described RS485 is provided with a RS232 serial ports and 32 pairs of RS485 bus interface, described RS232 serial ports is connected to main frame by first circuit, each is connected with a pair of slave pairing by second circuit simultaneously to the RS485 bus interface, and when described slave number is odd number, last only connects a slave to the RS485 bus interface, each communication distance to the slave that the RS485 bus interface connects is not more than 1200m
Described main frame adopts each slave of half-duplex mode poll, and passes through the communication direction of the star-like hub of RTS control RS485 of RS232 serial ports,
Each RS485 bus interface is provided with lightning protection device and anti-surge device,
Second circuit is the structure of twisted-pair feeder.
2. RS485 star bus according to claim 1 system, it is characterized in that: described RS485 bus interface is the RJ45 interface.
3. RS485 star bus according to claim 1 system is characterized in that:
Transfer of data is wherein supported various universal asynchronous receiving-transmitting transmission frame formats, and baud rate is supported 115200bps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100616077A CN102158382A (en) | 2011-03-15 | 2011-03-15 | RS485 star-shaped bus system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100616077A CN102158382A (en) | 2011-03-15 | 2011-03-15 | RS485 star-shaped bus system |
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| CN102158382A true CN102158382A (en) | 2011-08-17 |
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| CN2011100616077A Pending CN102158382A (en) | 2011-03-15 | 2011-03-15 | RS485 star-shaped bus system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104243256A (en) * | 2014-09-13 | 2014-12-24 | 国家电网公司 | RS485 bus star-shaped extension device and method |
| CN104765669A (en) * | 2015-04-24 | 2015-07-08 | 昆明船舶设备集团有限公司 | New airport information system parallel testing method for copying AFTN messages synchronously |
| CN106021166A (en) * | 2016-05-16 | 2016-10-12 | 从兴技术有限公司 | RS485 bus-based multi-host communication circuit |
| CN106023575A (en) * | 2016-06-15 | 2016-10-12 | 长沙瑞斯康通信技术有限公司 | Communication method and system of II type collector |
| CN106504512A (en) * | 2016-12-15 | 2017-03-15 | 瑞斯康微电子（深圳）有限公司 | II type harvesters, collecting method and system |
| CN117240651A (en) * | 2023-11-14 | 2023-12-15 | 广东宝莱特医用科技股份有限公司 | Method for inquiring equipment online, telemetry system, electronic equipment and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101446823A (en) * | 2008-10-22 | 2009-06-03 | 环境保护部华南环境科学研究所 | Sewage disposal PLC process automatic control system |
| CN201608740U (en) * | 2010-02-25 | 2010-10-13 | 广州市科秀电子科技有限公司 | Embedded fire incident data transmission device |
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2011
- 2011-03-15 CN CN2011100616077A patent/CN102158382A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446823A (en) * | 2008-10-22 | 2009-06-03 | 环境保护部华南环境科学研究所 | Sewage disposal PLC process automatic control system |
| CN201608740U (en) * | 2010-02-25 | 2010-10-13 | 广州市科秀电子科技有限公司 | Embedded fire incident data transmission device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104243256A (en) * | 2014-09-13 | 2014-12-24 | 国家电网公司 | RS485 bus star-shaped extension device and method |
| CN104765669A (en) * | 2015-04-24 | 2015-07-08 | 昆明船舶设备集团有限公司 | New airport information system parallel testing method for copying AFTN messages synchronously |
| CN104765669B (en) * | 2015-04-24 | 2018-10-12 | 昆明船舶设备集团有限公司 | The synchronous new airport information system parallel test method for replicating AFTN messages |
| CN106021166A (en) * | 2016-05-16 | 2016-10-12 | 从兴技术有限公司 | RS485 bus-based multi-host communication circuit |
| CN106021166B (en) * | 2016-05-16 | 2019-02-26 | 从兴技术有限公司 | Multi-host communication circuit based on RS485 bus |
| CN106023575A (en) * | 2016-06-15 | 2016-10-12 | 长沙瑞斯康通信技术有限公司 | Communication method and system of II type collector |
| CN106504512A (en) * | 2016-12-15 | 2017-03-15 | 瑞斯康微电子（深圳）有限公司 | II type harvesters, collecting method and system |
| CN117240651A (en) * | 2023-11-14 | 2023-12-15 | 广东宝莱特医用科技股份有限公司 | Method for inquiring equipment online, telemetry system, electronic equipment and storage medium |
| CN117240651B (en) * | 2023-11-14 | 2024-03-22 | 广东宝莱特医用科技股份有限公司 | Method for inquiring equipment online, telemetry system, electronic equipment and storage medium |
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Application publication date: 20110817 |