CN206133545U - Device that detect is carried out access state of RS232 interface - Google Patents
Device that detect is carried out access state of RS232 interface Download PDFInfo
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- CN206133545U CN206133545U CN201620903196.XU CN201620903196U CN206133545U CN 206133545 U CN206133545 U CN 206133545U CN 201620903196 U CN201620903196 U CN 201620903196U CN 206133545 U CN206133545 U CN 206133545U
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Abstract
The utility model discloses a device that detect is carried out access state of RS232 interface, include: two terminal equipment that have the RS232 interface through the cable connection, wherein, be in to receive the RS232 interface of end, its receiving terminal is connected with one in order carrying out the detection circuitry that monitors to its voltage -to -ground value, with warning mechanism or processing mechanism that detection circuitry connects, according to the corresponding level state of detection circuitry output, and then show or the access state of judgement at the cable of the RS232 interface of receipts end. The utility model provides a device that detect is carried out access state of RS232 interface, its can be when whether RS232 interface receiver input section cable be connected the voltage -to -ground different, use the detection circuitry automatic detection line cable whether to connect to do benefit to the detection to the RS232 connection status, ensure security, the stability of its data transmission in -process.
Description
Technical field
The utility model is related to a kind of detection means used in the case of data communication.More specifically, this practicality is new
Type is related to a kind of device detected to the access state of RS232 interfaces in the case of data communication.
Background technology
Under normal circumstances, when the RS232 interfaces of certain equipment connect the RS232 interfaces of other equipment by cable, need to make
Check whether it normally connects with serial communication software or Error Detector transceiving data.
If but occurring cable connecting fault in use, the information that other side sends then may lose, and reciever
May not know that other side was once transmitted across information yet.In order to judge whether cable connection is normal in real time, one kind is needed to its RS232
Connection status between interface is carried out in real time, persistently detect, and provides corresponding state instruction, is beneficial to stablizing for data transmit-receive
Property and reliability.
Under normal circumstances, a RS232 interface is made up of a transmitter and a receiver, and receiver input has one
To the pull down resistor on ground, this is caused when the transmitter of other RS232 interfaces is connected without cable, its receiver input it is right
Ground voltage is 0V or so, and the transmitter of RS232 interfaces output voltage-to-ground is usually between -5V～-15V or+5V～+15V.
Therefore：
The receiver of RS232 interfaces is input into when the transmitter of other RS232 interfaces is connected without cable, and voltage-to-ground is
0V or so；
The receiver of RS232 interfaces is input into when there is cable normally to connect the transmitter of other RS232 interfaces, voltage-to-ground
For between -5V～-15V or+5V～+15V.
Utility model content
A purpose of the present utility model is to solve at least the above and/or defect, and offer at least will be described later
Advantage.
The utility model it is also an object that provide the device that a kind of access state to RS232 interfaces is detected,
It can voltage-to-ground be different when whether RS232 interface receivers importation cable connects, and is examined automatically using detection circuit
Whether survey line cable connects, and its State- output can drive LED light or deliver to CPU, FPGA etc. and be identified control, be beneficial to
Detection to RS232 connection status, it is ensured that the security, stability in its data transmission procedure.
In order to realize according to these purposes of the present utility model and further advantage, there is provided a kind of that RS232 interfaces are connect
Enter the device that state is detected, including：
Two connected by cable have the terminal device of RS232 interfaces；
Wherein, in the RS232 interfaces of receiving end, its receiving terminal is connected with an inspection to be monitored to its voltage-to-ground value
Slowdown monitoring circuit, the warning mechanism being connected with the detection circuit or processing mechanism, according to the corresponding level of the detection circuit output
State, and then the access state of the cable of display or judgement in the RS232 interfaces of receiving end.
Preferably, wherein, in the RS232 interfaces of receiving end, its receiving terminal connects in the RS232 for being connected with corresponding end
Mouthful when, its be input into detection circuit voltage-to-ground be configured between -5V～-15V or+5V～+15V, otherwise for -5V～+
Between 5V.
Preferably, wherein, it is described detection circuit include using comparator A, comparator B composition window comparator electricity
Road.
Preferably, wherein, in the window comparator circuit, the in-phase end of the comparator A, comparator B it is anti-
Phase end is connected to respectively the receiver input of receiving end RS232 interface by a potential-divider network；
The end of oppisite phase of the comparator A, the in-phase end of comparator B are connected to, to provide anticipation for each comparator
The benchmark A of value, benchmark B；
And the output end of each comparator is serially connected with respectively diode, after to each output using "or" logic, to enter
And export level state corresponding with access state.
Preferably, wherein, when working power VCC of each comparator is all higher than 15V, the homophase of the comparator A
End, the end of oppisite phase of comparator B may be connected directly to the receiver input of receiving end RS232 interface.
Preferably, wherein, the benchmark A is set to less than the positive voltage over the ground of 5V, and benchmark B is set to less than 5V
Negative voltage over the ground.
Preferably, wherein, the magnitude of voltage corresponding to the benchmark A, benchmark B, respectively by corresponding comparator string
Right ± VCC the partial pressures of a divider resistance for connecing are to obtain.
Preferably, wherein, the comparator A, comparator B are any one in single comparator or operational amplifier
Plant, or the comparator A, comparator B are integrated in same chip.
Preferably, wherein, the warning mechanism be LED light, the processing mechanism be arranged on receiving end CPU or
FPGA。
Preferably, wherein, it is described detection circuit output level state be arranged to：When cable meets two RS232
When mouth is in connected state, the output state of the detection circuit is to be arranged to high level；Conversely, output state is to be set
For low level.
The utility model at least includes following beneficial effect：First, the utility model can be defeated according to RS232 interface transmitters
Go out the characteristic of fractional hardware circuit and receiver importation hardware circuit, using hardware circuit automatic detection RS232 interface line
Whether cable accesses.When there is the equipment with RS232 interfaces to access RS232 interfaces by cable, automatic detection simultaneously shows its access
State, and then realize the monitoring to RS232 interface connection status, it is ensured that the safety and reliability of data transfer.
Second, whether detection circuit of the present utility model based on RS232 interface receivers importation cable when being connected pair
Ground voltage is different, constitutes whether window comparator circuit automatic detection cable connects using two comparators, and State- output can drive
Dynamic LED light or deliver to CPU, FPGA etc. be identified control, with simple structure, it is easy to accomplish, strong operability, stability
It is good, the strong effect of data transmission credibility.
Further advantage of the present utility model, target and feature embody part by description below, and part will also pass through
Research of the present utility model and practice are understood by the person skilled in the art.
Description of the drawings
Fig. 1 is the knot of the device detected to the access state of RS232 interfaces in one embodiment of the present utility model
Structure schematic diagram.
Specific embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to explanation
Book word can be implemented according to this.
It should be appreciated that it is used herein such as " have ", "comprising" and " including " term do not allot one or many
The presence or addition of individual other elements or its combination.
Fig. 1 shows the reality of the device detected according to a kind of access state to RS232 interfaces of the present utility model
Existing form, including：
Two connected by cable have the terminal device 1,2 of RS232 interfaces；
Wherein, in the RS232 interfaces 20 of receiving end, its receiving terminal is connected with one to be monitored its voltage-to-ground value
Detection circuit 21, the warning mechanism being connected with the detection circuit or processing mechanism, according to the corresponding of the detection circuit output
Level state, and then the access state of the cable of display or judgement in the RS232 interfaces of receiving end.Using this scheme energy according to
The characteristic of RS232 interfaces transmitter output par, c hardware circuit and receiver importation hardware circuit, using hardware circuit certainly
Whether dynamic detection RS232 interface cables access.When there is the equipment with RS232 interfaces to access RS232 interfaces by cable, automatically
Detect and show its access state, and then realize the monitoring to RS232 interface connection status, it is ensured that the security of data transfer and
The benefit of reliability.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.Implementing this
During utility model, appropriate replacement and/or modification can be carried out according to user's demand.
In another kind of example, in the RS232 interfaces of receiving end, its receiving terminal is being connected with the RS232 of corresponding end
During interface, its be input into detection circuit voltage-to-ground be configured between -5V～-15V or+5V～+15V, otherwise for -5V～
Between+5V.Voltage-to-ground is different when whether being connected based on RS232 interface receivers importation cable using this scheme, with
The access state of RS232 interfaces is detected by the magnitude of voltage of input detecting circuit, it is ensured that the stability of data transfer
Benefit.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.Implementing the utility model
When, appropriate replacement and/or modification can be carried out according to user's demand.
As shown in figure 1, in another kind of example, the detection circuit is included using comparator A 22,23 groups of comparator B
Into window comparator circuit.It is capable of achieving to its access state by succinct window comparator circuit using this scheme
Monitoring, with can implementation result it is good, workable, simple structure, the controllable benefit of cost.Also, this mode is only
It is a kind of explanation of preferred embodiments, but is not limited thereto.When the utility model is implemented, can be carried out according to user's demand
Appropriate replacement and/or modification.
As shown in figure 1, in another kind of example, in the window comparator circuit, the in-phase end of the comparator A,
The end of oppisite phase of comparator B is connected to respectively the receiver input of receiving end RS232 interface by a potential-divider network 24；
The end of oppisite phase of the comparator A, the in-phase end of comparator B are connected to, to provide anticipation for each comparator
The benchmark A 25 of value, benchmark B 26；
And the output end of each comparator is serially connected with respectively diode 27,28, to adopt "or" logic to each output
Afterwards, and then corresponding with access state level state is exported.Using this scheme specifically to the concrete of window comparator circuit
Structure is defined, comply with correlation requirement, with can implementation result it is good, it is workable, simple structure it is favourable
Part.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.When the utility model is implemented, can
To carry out appropriate replacement and/or modification according to user's demand.
In another kind of example, when working power VCC of each comparator is all higher than 15V, the homophase of the comparator A
End, the end of oppisite phase of comparator B may be connected directly to the receiver input of receiving end RS232 interface.Using in this scheme
The effect of potential-divider network is the stable operating voltage in order to ensure comparator, when the VCC of its working power is all higher than 15V, than
When constant compared with the operating voltage of device, potential-divider network can no longer need, with strong adaptability, can implementation result it is good it is favourable it
Place.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.When the utility model is implemented, can be with
Appropriate replacement and/or modification is carried out according to user's demand.
In another kind of example, the benchmark A is set to less than the positive voltage over the ground of 5V, and benchmark B is set to less than
The negative voltage over the ground of 5V.Adopt this scheme is having cable to be normally connected not with corresponding with the receiver input of RS232 interfaces
RS232 interfaces transmitter when, voltage-to-ground be -5V～-15V or+5V～+15V it is corresponding, with by comparator to its point
Do not make a distinction and compare, with can good, the workable benefit of implementation result.Also, this mode be it is a kind of compared with
The explanation of good example, but be not limited thereto.When the utility model is implemented, appropriate replacing can be carried out according to user's demand
Change and/or change.
In another kind of example, the magnitude of voltage corresponding to the benchmark A, benchmark B, respectively by corresponding comparator string
Right ± VCC the partial pressures of a divider resistance for connecing are to obtain.Using this scheme have can implementation result it is good, simple structure, it is easy to real
Existing benefit.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.Implementing this practicality
When new, appropriate replacement and/or modification can be carried out according to user's demand.
In another kind of example, the comparator A, comparator B are any in single comparator or operational amplifier
One kind, or the comparator A, comparator B be integrated in same chip.Adopt this scheme to adapt to different uses
Demand and use environment, good with adaptability, workable benefit.Also, this mode is a kind of preferable reality
The explanation of example, but be not limited thereto.When the utility model is implemented, appropriate replacement can be carried out according to user's demand
And/or modification.
In another kind of example, the warning mechanism is LED light (not shown), and the processing mechanism is to be arranged on receipts
The CPU (not shown) or FPGA (not shown) at end.Adopt this scheme, using needs and environment, is carried out with according to specific to it
It is handled differently, with strong adaptability, can the good benefit of implementation result.Also, this mode is a kind of preferred embodiments
Illustrate, but be not limited thereto.When the utility model is implemented, can according to user's demand carry out appropriate replacement and/or
Modification.
In another kind of example, the level state of the detection circuit output is arranged to：When cable meets two RS232
When mouth is in connected state, the output state of the detection circuit is to be arranged to high level；Conversely, output state is to be set
For low level.LED light can be driven by State- output using this scheme or CPU, FPGA etc. is delivered to and be identified control,
To make a distinction to its different conditions, it is beneficial to the collection of later data, processes, and does corresponding judge or operation is repaiied accordingly
It is multiple, with can implementation result it is good, the benefit of strong operability.Also, this mode is a kind of explanation of preferred embodiments, but
It is not limited thereto.When the utility model is implemented, appropriate replacement and/or modification can be carried out according to user's demand.
Number of devices described herein and treatment scale are for simplifying explanation of the present utility model.To the utility model
The device that the access state of RS232 interfaces is detected application, modifications and variations to one skilled in the art
It is obvious.
Although embodiment of the present utility model is disclosed as above, it is not restricted in specification and embodiment
Listed utilization.It can be applied to completely various suitable fields of the present utility model.For those skilled in the art,
It is easily achieved other modification.Therefore under the universal limited without departing substantially from claim and equivalency range, this reality
Specific details is not limited to new and shown here as the legend with description.
Claims (10)
1. the device that a kind of access state to RS232 interfaces is detected, it is characterised in that include：
Two connected by cable have the terminal device of RS232 interfaces；
Wherein, in the RS232 interfaces of receiving end, the detection electricity that its receiving terminal is connected with to be monitored its voltage-to-ground value
Road, the warning mechanism being connected with the detection circuit or processing mechanism, according to the corresponding level state of the detection circuit output,
And then the access state of the cable of display or judgement in the RS232 interfaces of receiving end.
2. the device that the access state to RS232 interfaces as claimed in claim 1 is detected, it is characterised in that in receipts
The RS232 interfaces at end, when the RS232 interfaces of corresponding end are connected with, it is input into detection circuit over the ground its receiving terminal
Voltage is configured between -5V～-15V or+5V～+15V, otherwise between -5V～+5V.
3. the device that the access state to RS232 interfaces as claimed in claim 1 is detected, it is characterised in that the inspection
Slowdown monitoring circuit includes the window comparator circuit using comparator A, comparator B composition.
4. the device that the access state to RS232 interfaces as claimed in claim 3 is detected, it is characterised in that described
In window comparator circuit, the in-phase end of the comparator A, the end of oppisite phase of comparator B are connected to respectively by a potential-divider network
The receiver input of receiving end RS232 interface；
The end of oppisite phase of the comparator A, the in-phase end of comparator B are connected to, to provide anticipation value for each comparator
Benchmark A, benchmark B；
And the output end of each comparator is serially connected with respectively diode, with after to each output using "or" logic and then defeated
Go out level state corresponding with access state.
5. the device that the access state to RS232 interfaces as claimed in claim 4 is detected, it is characterised in that each described
When working power VCC of comparator is all higher than 15V, the in-phase end of the comparator A, the end of oppisite phase of comparator B can directly connect
It is connected to the receiver input of receiving end RS232 interface.
6. the device that the access state to RS232 interfaces as claimed in claim 4 is detected, it is characterised in that the base
Quasi- A is set to less than the positive voltage over the ground of 5V, and benchmark B is set to less than the negative voltage over the ground of 5V.
7. the device that the access state to RS232 interfaces as claimed in claim 4 is detected, it is characterised in that the base
Magnitude of voltage corresponding to quasi- A, benchmark B, the right ± VCC partial pressures of a divider resistance for being concatenated by corresponding comparator respectively are to obtain
Arrive.
8. the device that the access state to RS232 interfaces as claimed in claim 4 is detected, it is characterised in that the ratio
It is any one in single comparator or operational amplifier compared with device A, comparator B, or the comparator A, comparator B equal
In being integrated into same chip.
9. the device that the access state to RS232 interfaces as claimed in claim 1 is detected, it is characterised in that the police
Show that mechanism is LED light, the processing mechanism is the CPU or FPGA for being arranged on receiving end.
10. the device that the access state to RS232 interfaces as claimed in claim 1 is detected, it is characterised in that the inspection
The level state of slowdown monitoring circuit output is arranged to：When cable makes two RS232 interfaces be in connected state, the detection circuit
Output state to be arranged to high level；Conversely, output state is to be arranged to low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620903196.XU CN206133545U (en) | 2016-08-18 | 2016-08-18 | Device that detect is carried out access state of RS232 interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620903196.XU CN206133545U (en) | 2016-08-18 | 2016-08-18 | Device that detect is carried out access state of RS232 interface |
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| Publication Number | Publication Date |
|---|---|
| CN206133545U true CN206133545U (en) | 2017-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620903196.XU Active CN206133545U (en) | 2016-08-18 | 2016-08-18 | Device that detect is carried out access state of RS232 interface |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132502A (en) * | 2017-05-09 | 2017-09-05 | 无锡市恒通电器有限公司 | A kind of RS485 communication test devices of electric energy meter |
| CN108732462A (en) * | 2018-04-12 | 2018-11-02 | 华为技术有限公司 | A kind of detection device and method |
| WO2020142893A1 (en) * | 2019-01-08 | 2020-07-16 | 深圳市大疆创新科技有限公司 | Radar access detection method, circuit and movable platform |
-
2016
- 2016-08-18 CN CN201620903196.XU patent/CN206133545U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132502A (en) * | 2017-05-09 | 2017-09-05 | 无锡市恒通电器有限公司 | A kind of RS485 communication test devices of electric energy meter |
| CN108732462A (en) * | 2018-04-12 | 2018-11-02 | 华为技术有限公司 | A kind of detection device and method |
| US11047924B2 (en) | 2018-04-12 | 2021-06-29 | Huawei Technologies Co., Ltd. | Detection apparatus and method |
| WO2020142893A1 (en) * | 2019-01-08 | 2020-07-16 | 深圳市大疆创新科技有限公司 | Radar access detection method, circuit and movable platform |
| CN111684296A (en) * | 2019-01-08 | 2020-09-18 | 深圳市大疆创新科技有限公司 | Radar access detection method, circuit and movable platform |
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