CN204442400U - A kind of mining RS-485 isolates repeater - Google Patents
A kind of mining RS-485 isolates repeater Download PDFInfo
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- CN204442400U CN204442400U CN201520162558.XU CN201520162558U CN204442400U CN 204442400 U CN204442400 U CN 204442400U CN 201520162558 U CN201520162558 U CN 201520162558U CN 204442400 U CN204442400 U CN 204442400U
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- 238000005065 mining Methods 0.000 title claims abstract description 7
- 238000002955 isolation Methods 0.000 claims description 7
- 239000003245 coal Substances 0.000 abstract description 11
- 238000013461 design Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The utility model discloses a kind of mining RS-485 and isolate repeater, it is characterized in that, comprise signal 1 end, signal 2 end, automatic transceiving change-over circuit and insulating power supply, the transmitting terminal of described signal 1 end is connected with signal 2 termination receiving end, the receiving terminal of signal 1 end is connected with signal 2 end transmitting terminal, the transmitting terminal of automatic transceiving change-over circuit 1 connection signal 1 end and transmitting-receiving control end, the transmitting terminal of automatic transceiving change-over circuit 2 connection signal 2 end and transmitting-receiving control end, insulating power supply provides insulating power supply for signal 1 end and signal 2 end.The design of this repeater circuit meets Safety of Coal Mine Production technical specification and requirement, can be used for underground coal mine RS-485 and communicates.
Description
Technical field
The utility model relates to a kind of industrial communication technical field, particularly relates to a kind of isolation repeater being applicable to the RS-485 communication of underground coal mine.
Background technology
RS-485 bus is a kind of for devices interconnect net, Eco-power, traditional industrial bus signal transmission form.RS-485 bus is a kind of fieldbus form that measurement and control area extensively adopts, and owing to have employed the mode of balance transmission and differential received, effectively can overcome common mode disturbances, and have higher message transmission rate and transmission range.
Along with the development of mine supervision system, the monitor network be made up of RS-485 communication interface, has been widely used in the supervisory control systems such as colliery electric power, safety.Due to the particularity of subsurface environment, the RS-485 signal that general device exports can not meet the requirement of underground coal mine, therefore needs the signal to inside provides to isolate with the signal externally exported, namely adopts RS-485 to isolate repeater.
At present, traditional RS-485 isolates repeater and generally adopts light-coupled isolation mode, this isolation repeater mainly comprises non-isolated 485 chip, high speed photo coupling and insulating power supply, insulating power supply provides insulating power supply for optocoupler both sides, send, receive and receive and dispatch control signal and realize isolation by high speed photo coupling, thus achieve communication isolating.Which major defect has circuit structure complexity, rate-constrained etc.
Utility model content
Technical problem to be solved in the utility model is: overcome the RS-485 existed in prior art and isolate repeater Problems existing, provide a kind of simple and practical RS-485 to isolate repeater, can be widely used in the RS-485 signal isolation occasion of underground coal mine.
The utility model is achieved through the following technical solutions:
A kind of mining RS-485 isolates repeater, it is characterized in that, comprise signal 1 end, signal 2 end, automatic transceiving change-over circuit and insulating power supply, the transmitting terminal of described signal 1 end is connected with signal 2 termination receiving end, the receiving terminal of signal 1 end is connected with signal 2 end transmitting terminal, the transmitting terminal of automatic transceiving change-over circuit 1 connection signal 1 end and transmitting-receiving control end, the transmitting terminal of automatic transceiving change-over circuit 2 connection signal 2 end and transmitting-receiving control end, insulating power supply provides insulating power supply for signal 1 end and signal 2 end.The design of this repeater circuit meets Safety of Coal Mine Production technical specification and requirement, can be used for underground coal mine RS-485 and communicates.
The utility model is mining, and RS-485 isolates repeater compared with prior art, has following beneficial effect:
1. the utility model has the feature of modularization, small size, low-power consumption;
2. the utility model eliminate the uncertain electric current transfer ratio relevant to optocoupler, non-linear transfer characteristic useful and in time drift and with temperature drift problems;
3. the utility model takes into full account colliery intrinsic safety requirements when designing, and meets the requirement of underground coal mine particular surroundings to electric equipment, can be used in the RS-485 signal isolation occasion of underground coal mine.
Accompanying drawing explanation
Fig. 1 is the utility model structured flowchart;
Fig. 2 is the utility model signal 1 end and automatic transceiving change-over circuit 1 circuit diagram;
Fig. 3 is the utility model signal 2 end and automatic transceiving change-over circuit 2 circuit diagram;
Fig. 4 is the utility model insulating power supply circuit diagram.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect and be easy to understand and understand, below in conjunction with drawings and Examples, the utility model is described further.The present embodiment must not be used for explaining the restriction to the utility model protection range.
Referring to Fig. 1
Mining RS-485 described in the present embodiment isolates repeater, comprise signal 1 end, signal 2 end, automatic transceiving change-over circuit and insulating power supply, the transmitting terminal of described signal 1 end is connected with signal 2 termination receiving end, the receiving terminal of signal 1 end is connected with signal 2 end transmitting terminal, the transmitting terminal of automatic transceiving change-over circuit 1 connection signal 1 end and transmitting-receiving control end, the transmitting terminal of automatic transceiving change-over circuit 2 connection signal 2 end and transmitting-receiving control end, insulating power supply provides insulating power supply for signal 1 end and signal 2 end.The design of this repeater circuit meets Safety of Coal Mine Production technical specification and requirement, can be used for underground coal mine RS-485 and communicates.
Referring to Fig. 2
This circuit comprises signal 1 end and automatic transceiving change-over circuit 1; the RS-485 telecommunication circuit that signal 1 end comprises surge protection circuit, antireflection resistance and forms based on SP485, automatic transceiving change-over circuit 1 comprises inverter 74HC1G04, resistance, electric capacity and diode etc.
Referring to Fig. 3
This circuit comprises signal 2 end and automatic transceiving change-over circuit 2; the RS-485 telecommunication circuit that signal 2 end comprises surge protection circuit, antireflection resistance and forms based on ADM3483, automatic transceiving change-over circuit 2 comprises inverter 74HC1G04, resistance, electric capacity and diode etc.
Referring to Fig. 4
The B0505S-1W insulating power supply module that described insulating power supply circuit adopts Guangdong Jin Shengyang company to produce, these power supply input and output are 5V insulating power supply, carry out filtering process to power input and output.
Repeater operation principle is as follows:
Repeater is divided into idle and transfer of data two states, and data transmission format is start bit, data bit, parity check bit and position of rest normally.Sending mouth time idle is high level, and when there being data, bus skips to low level by high level, and this low level is just as start bit.
(1) idle condition
When repeater electrifying startup runs or bus does not have data to transmit, repeater operation is in idle condition, and RS-485 transceiver U1, U2 are reception data mode, and transmitting-receiving control end DI2, RO2 are high level.
(2) the right biography of data
When RS-485 transceiver U1 detects that the differential wave connected in its A1, B1 pin bus has data to transmit left, it receives data by the RO pin of RS-485 transceiver U1 by turn in the mode of RS-232, and exports data by the TXD pin of RS-485 transceiver U2 by turn in the mode of RS-232.
When differential signal becomes low level (start bit), DI2 becomes low level, DI2 except as the shaping again through Schmidt trigger except data, oppositely after as the control signal of U2, because control signal is now high level, represent to send and allow, therefore low level signal is passed through A2, B2 difference output by U2.
After start bit terminates, data bit below may be high-order, also may be low level, and point following two kinds of situations illustrate:
1) if low level, known according to analyzing above, exportable low level.
2) if high-order, high level signal can be received by U1, but not by U2, because now DI2 is high level, then the transmitting-receiving control signal of U2 is low level, therefore U2 is in accepting state.Now due to the pull-up effect of resistance, A2, B2 differential bus of U2 is still rendered as high level signal.
(3) the left biography of data
When RS-485 transceiver U2 detects that the differential wave connected in its A2, B2 pin bus has data to transmit left, it receives data by the RXD pin of RS-485 transceiver U2 by turn in the mode of RS-232, and exports data by the DI pin of RS-485 transceiver U1 by turn in the mode of RS-232.
When differential signal becomes low level (start bit), RO2 becomes low level, RO2 except as the shaping again through Schmidt trigger except data, oppositely after as the control end of U1, because control signal is now high level, represent to send and allow, therefore low level signal is passed through A1, B1 difference output by U1.
After start bit terminates, data bit below may be high-order, also may be low level, and point following two kinds of situations illustrate:
1) if low level, known according to analyzing above, exportable low level.
2) if high-order, high level signal can be received by U2, but not by U1, because now RO2 is high level, then the transmitting-receiving control signal of U1 is low level, therefore U1 is in accepting state.Now due to the pull-up effect of resistance, A1, B1 differential bus of U1 is still rendered as high level signal.
The effect of automatic transceiving change-over circuit is as follows:
When the input signal of automatic transceiving change-over circuit is low level, RC delay circuit is through diode discharge, and through extremely short discharge lag, output control signal is high level; When input signal is high level, RC delay circuit charges, through and RC product associated time to charge time delay, output control signal is low level.。Therefore transmitter is when transmission high level, is no longer be in high-impedance state, still has drive current to exist, can increase the antijamming capability of interface so to a certain extent in short time delay.
Claims (2)
1. a mining RS-485 isolates repeater, it is characterized in that, comprise signal 1 end, signal 2 end, automatic transceiving change-over circuit and insulating power supply, the transmitting terminal of described signal 1 end is connected with signal 2 termination receiving end, the receiving terminal of signal 1 end is connected with signal 2 end transmitting terminal, the transmitting terminal of automatic transceiving change-over circuit 1 connection signal 1 end and transmitting-receiving control end, the transmitting terminal of automatic transceiving change-over circuit 2 connection signal 2 end and transmitting-receiving control end, insulating power supply provides insulating power supply for signal 1 end and signal 2 end.
2. mining RS-485 according to claim 1 isolates repeater, it is characterized in that, described signal 1 end adopts 485 chips of non-isolated, and described signal 2 end adopts isolation 485 chip ADM2483.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520162558.XU CN204442400U (en) | 2015-03-23 | 2015-03-23 | A kind of mining RS-485 isolates repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520162558.XU CN204442400U (en) | 2015-03-23 | 2015-03-23 | A kind of mining RS-485 isolates repeater |
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| Publication Number | Publication Date |
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| CN204442400U true CN204442400U (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520162558.XU Expired - Fee Related CN204442400U (en) | 2015-03-23 | 2015-03-23 | A kind of mining RS-485 isolates repeater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108616434A (en) * | 2016-12-12 | 2018-10-02 | 徐州新隆全电子科技有限公司 | Double isolation half-duplex repeaters based on RS-485 buses |
| CN111600697A (en) * | 2020-06-12 | 2020-08-28 | 珠海市圣昌电子有限公司 | Half-duplex relay circuit |
-
2015
- 2015-03-23 CN CN201520162558.XU patent/CN204442400U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108616434A (en) * | 2016-12-12 | 2018-10-02 | 徐州新隆全电子科技有限公司 | Double isolation half-duplex repeaters based on RS-485 buses |
| CN111600697A (en) * | 2020-06-12 | 2020-08-28 | 珠海市圣昌电子有限公司 | Half-duplex relay circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20160323 |
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| CF01 | Termination of patent right due to non-payment of annual fee |