CN116319658A - Multi-address identification method and communication system - Google Patents

Abstract

The application provides a multi-address identification method and a communication system, wherein the method is based on a 555 circuit and comprises the following steps: the method comprises the steps that address pre-stored tables of a plurality of communication slaves are preset in a communication bus; setting the resistance value of the resistor or the capacitance value of the capacitor of each communication slave access 555 circuit; the 555 circuit outputs square waves corresponding to the resistor or the capacitor; acquiring high-level time or square wave period of the square wave, and finding out the address of the corresponding communication slave machine on the address pre-storing table according to the high-level time or square wave period; the method and the device can identify the addresses of a plurality of communication slaves, and can ensure the precision so that the communication bus can accurately give instructions to the communication slaves.

Description

Multi-address identification method and communication system

technical field

The present application relates to the technical field of communication, in particular to a multi-address identification method and a communication system.

Background technique

The power exchange cabinet is a type of equipment used to receive batteries (such as battery car batteries) and charge them. At present, the cabinet control communication architecture of the power exchange cabinet can only determine whether the battery is in the cabinet by assigning a dedicated hardware interface to each battery. addresses, but it is impossible to hang all the batteries on the same bus network (such as CAN, 485, etc.) The manufacturing cost of the cabinet and the matching battery is extremely expensive, and it will make the cabinet control communication architecture of the power exchange cabinet complicated and difficult to maintain.

Contents of the invention

The purpose of this application is to provide a multi-address identification method and a communication system. This application can identify the addresses of multiple communication slaves, and can ensure accuracy, so that the communication bus can accurately issue instructions to the communication slaves.

To this end, in the first aspect, the embodiment of the present application provides a multi-address identification method based on a 555 circuit, which includes the following steps:

S1. The address pre-storage table of multiple communication slaves is preset inside the communication bus;

S2. Setting the resistance value of each of the communication slaves connected to the 555 circuit or the capacitance value of the capacitor;

S3. The 555 circuit outputs a square wave corresponding to the resistor or the capacitor;

S4. Obtain the high level time or square wave period of the square wave, and find the corresponding communication slave address in the address pre-storage table according to the high level time or the square wave period.

The present application also provides a communication system in the second aspect, based on the multi-address identification method as described in the first aspect, the communication system includes a power exchange cabinet and a plurality of batteries; the power exchange cabinet is configured for the communication bus, and the battery is configured as the communication slave.

This application proposes a multi-address identification method and a communication system. Compared with the prior art, the beneficial effects are:

This method pre-sets an address pre-storage table with multiple communication slave addresses inside the communication bus, and sets the resistance value of the resistance or the capacitance value of the capacitor connected to the 555 circuit for each communication slave, and then corresponds to the resistance value according to the 555 circuit. or the high level time or square wave period of the square wave output by the capacitor, find the address of the corresponding communication slave on the address pre-stored table; therefore, this method can save a lot of hardware interfaces, save costs, and ensure Accuracy, identifying the addresses of multiple communication slaves, so that the communication bus can issue instructions to the communication slaves.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work. In addition, in the drawings, the same reference numerals are used for the same components, and the drawings are not drawn in actual scale.

Fig. 1 is the circuit diagram of the resistance that the first resistance is inserted into 555 circuit as communication slave of this method;

Fig. 2 is the circuit diagram of the resistance that the second resistance is inserted into 555 circuit as communication slave of this method;

Fig. 3 is the circuit diagram of the capacitance that the first capacitance is inserted into the 555 circuit as the communication slave of this method;

Explanation of reference signs:

1. The first resistor; 2. The second resistor; 3. The first capacitor; 4. The pulse generator; 5. The supply voltage.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

The embodiment of the present application proposes a multi-address identification method based on the 555 circuit in the first aspect, including the following steps:

S1. The address pre-storage table of multiple communication slaves is preset inside the communication bus;

S2, setting the resistance value of the resistor or the capacitance value of the capacitor connected to the 555 circuit for each communication slave;

S3, 555 circuit corresponds to the resistance or capacitance output square wave;

S4. Obtain the high level time or the square wave period of the square wave, and find the address of the corresponding communication slave in the address pre-storage table according to the high level time or the square wave period.

Based on the above technical solution, this method pre-sets an address pre-storage table with multiple communication slave addresses inside the communication bus, and sets the resistance value of the resistance or the capacitance value of the capacitor connected to the 555 circuit for each communication slave, and then according to The 555 circuit corresponds to the high-level time or the square wave period of the square wave output by the resistor or capacitor, and finds the address of the corresponding communication slave in the address pre-stored table; therefore, this method can save a large number of hardware interfaces and save cost, and can ensure accuracy and identify the addresses of multiple communication slaves, so that the communication bus can issue instructions to the communication slaves.

This application uses a device parameter of the 555 circuit to output a digital signal to interpret the correspondence between the address of the communication bus and the communication slave, which greatly reduces the difficulty of identifying the address and reduces the number of hardware interfaces.

The 555 circuit refers to the 555 time base circuit. The 555 IC can be used to create a free-running astable oscillator to continuously generate square wave pulses to produce a very stable 555 oscillator circuit for generating high-precision free-running waveforms. Its output frequency can be adjusted by an externally connected RC oscillating circuit, and this RC oscillating circuit is only composed of two resistors and a capacitor; here, the 555 circuit used in this application includes a first resistor 1, a second resistor 2 , the first capacitor 3, the pulse generator 4 and the power supply voltage 5, the power input end of the first resistance 1 is electrically connected with the power supply voltage 5, the power output end is respectively connected with the power input end of the second resistance 2 and the pulse generator 4 connected, the power output end of the second resistor 2 is electrically connected to the power input end of the first capacitor 3 and the pulse generator 4, and the other end of the first capacitor 3 is grounded; therefore, in this application, the first resistor 1 or the first capacitor 3 The second resistor 2 is configured as a resistor connected to the 555 circuit by the communication slave, or the first capacitor 3 is configured as a capacitor connected to the 555 circuit by the communication slave.

Here, please refer to accompanying drawing 1-accompanying drawing 3, this method also comprises the following steps:

S41. When the first resistor 1 is configured as the resistor connected to the 555 circuit by the communication slave, the 555 circuit outputs the first square wave corresponding to the first resistor 1, and the communication bus obtains the high level time of the first square wave, and corresponds to Find the address of the communication slave on the address pre-storage table;

S42. When the second resistance 2 is configured as the resistance connected to the 555 circuit by the communication slave, the 555 circuit outputs the second square wave corresponding to the second resistance 2, and the communication bus obtains the square wave period of the second square wave, and corresponds to the address Find the address of the communication slave on the pre-stored table;

S43. When the first capacitor 3 is configured as a communication slave connected to the capacitor of the 555 circuit, the 555 circuit outputs a third-party wave corresponding to the first capacitor 3, and the communication bus obtains the square wave cycle of the third-party wave, and correspondingly stores it in the address pre-stored table Find the address of the communication slave on the

By adjusting the resistance value of the first resistor 1, the high-level duty cycle can be adjusted. There is a linear relationship between the first resistor 1 and the high-level duty cycle of the square wave output by pin 3 of the 555 circuit. Similarly, by adjusting the second The resistance value of the resistor 2 and the capacitance value of the first capacitor 3 can adjust the period of the output square wave, and both the second resistor 2 and the first capacitor 3 have a linear relationship with the period of the square wave output by the pin 3 of the 555 circuit.

And, in the 555 circuit, pin 2 and pin 6 are connected together, allowing the circuit to reconnect to trigger itself on each cycle, making it run as a free oscillator, during each cycle, the first capacitor 3 passes two The timing resistor (the first resistor 1 and the second resistor 2) is charged, but only one timing resistor, the second resistor 2, is discharged; the first capacitor 3 is charged to 2/3Vcc (upper comparator limit) by 0.693 (R1+R2) *C combination is determined, and discharges itself to 1/3Vcc (lower limit comparator limit), which is determined by 0.693 (R2*C) combination (wherein, 0.693 is a constant of the RC oscillator circuit, which will not be explained here, and R1 is The resistance value of the first resistor 1, R2 is the resistance value of the second resistor 2, and C is the capacitance value of the first capacitor 3), which causes the voltage of the output waveform to be approximately equal to Vcc-1.5V, and its output "ON" and "OFF ” The time period is determined by the capacitor and resistor combination; therefore, the time required to charge and discharge an output is as follows:

The 555 oscillator charging time is as follows:

t1=0.693(R1+R2)*C;

The 555 oscillator discharge time is as follows:

t2=0.693(R2*C);

Therefore, the formula for calculating the period of a square wave is:

T=t1+t2=0.693(R1+2R2)*C

For example, when R1=1kΩ, R2=2kΩ, and C=10uF are selected, the charging time of the 555 oscillator is 21ms, and the discharging time of the 555 oscillator is 14ms, that is, the high level time at this time is 21ms, and the square wave period is 35ms.

Here, in order to ensure that the addresses of different communication slaves correspond to different high-level times or square wave periods, and in order to ensure accuracy, this application preferably increases the resistance value of the first resistor 1 of multiple communication slaves in equal increments; Or, the resistance values of the second resistors 2 of the plurality of communication slaves increase incrementally; or, the capacitance values of the first capacitors 3 of the plurality of communication slaves increase incrementally.

In some embodiments, the application can choose the first resistor 1, the second resistor 2 or the first capacitor 3 as the resistor or capacitor for the communication slave to connect to the 555 circuit, or select the first resistor 1 for some communication slaves. The resistor connected to the 555 circuit, and some communication slaves select the second resistor 2 or the first capacitor 3 as the resistor or capacitor connected to the 555 circuit.

Optionally, a 5V power supply voltage is selected, C1 is a fixed value of 100uf, R2 is a fixed value of 5kΩ, and R1 is the only variable value, then the relationship between R1 and the high level time of the output waveform is shown in Table 1:

slave address R1(kΩ) Output waveform period (ms) Output waveform high level (ms) 0 1 267 200 1 2 408 273 2 3 540 340 3 4 680 410 4 5 815 475 5 6 960 550 6 7 1100 625 7 8 1240 690 8 9 1370 755

Table 1

Optionally, a 5V power supply voltage is selected, C1 is a fixed value of 100uf, R1 is a fixed value of 2kΩ, and R2 is a unique variable value, then the relationship between R2 and the period of the output waveform is shown in Table 2:

slave address R2(kΩ) Output waveform period (ms) Output waveform high level (ms) 0 1 750 405 1 2 815 480 2 3 890 550 3 4 955 615 4 5 1020 685 5 6 1090 755 6 7 1160 825 7 8 1230 895 8 9 1300 965

Table 2

Optionally, a 5V power supply voltage is selected, R1 is a fixed value of 2kΩ, R2 is a fixed value of 5kΩ, and C1 is the only variable value, then the relationship between C1 and the period of the output waveform is shown in Table 3:

table 3

It can be concluded from this table that the relationship between R1 and the high-level time of the output square wave, R2 and the period of the output square wave, and C1 and the period of the output square wave are all linear.

Since the resistance value of the first resistor 1 or the second resistor 2 is greatly affected by the ambient temperature, in order to ensure the accuracy, the address of the communication slave can correspond to the high level time of the corresponding square wave or the period of the square wave, This application sets the address of the communication slave as the value (90%-110%) of the high level time of the corresponding square wave or the square wave period, or, it can be understood that the address of a certain number of communication slave is as follows: The address of machine No. 1 is the high level time of the corresponding square wave or the value of the square wave period (90%-110%), such as: the above high level time is 21ms, and the address of the corresponding communication slave 18.9-23.1, this application can also choose other numerical ranges, so as to finely divide the address of the communication slave according to the number of communication slaves, so that the communication bus can accurately obtain the address of the communication slave and issue instructions.

Specifically, the communication slave is provided with a first resistor 1, a second resistor 2 or a first capacitor 3, and the communication slave is connected to the communication bus through an external joint, so that the first resistor 1, the second resistor 2 or the first capacitor A capacitor 3 is connected to the 555 circuit.

In this application, obtaining the high level time of the square wave includes the following steps:

S31. The communication slave obtains the high level time of the square wave according to a rising edge interrupt and a falling edge interrupt of the io port;

S32, obtaining the square wave period of the square wave includes the following steps:

The communication slave obtains the square wave cycle of the square wave according to the two rising edge interrupts of the io port.

Moreover, the communication slave obtains the high-level time or square wave period through the input edge interrupt of the io port and the interrupt timing function of the timer or the capture function of the timer, so as to ensure the obtained high-level time or square wave period accuracy.

The embodiment of the present application also proposes a communication system in the second aspect. Based on the multi-address identification method as in the first aspect, the communication system includes a power exchange cabinet and multiple batteries; the power exchange cabinet is configured as a communication bus, and the battery is configured as a communication bus. Slave; and, the 555 circuit includes a first resistor 1, a second resistor 2 and a first capacitor 3; a plurality of charging compartments are arranged on the power exchange cabinet, and the first resistor 1, the second resistor 2 or the first capacitor 3 are set for charging cabin, and the battery is detachably connected to the charging cabin, and electrically connected to the first resistor 1, the second resistor 2 or the first capacitor 3; The temperature rise in the electric cabinet affects the recognition accuracy, and can effectively identify the address of each charging compartment, charge the battery inserted into the charging compartment, and automatically power off in the charging compartment when the battery is fully charged.

It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiment," "some embodiments," etc. mean that the described embodiments may include particular features, structures, or characteristics, but not necessarily Each embodiment includes that particular feature, structure or characteristic. Furthermore, such phrases are not necessarily referring to the same embodiment. Furthermore, where a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the purview of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments that are explicitly or not explicitly described.

It should be readily understood that "on", "above" and "over" in this disclosure should be interpreted in the broadest manner such that "on" means not only " directly on something", also includes the meaning of "on something" with intermediate features or layers in between, and "above" or "over" not only includes "on something" or " The meaning of "over" may also include the meaning of "above" or "over" without intervening features or layers (ie, directly on something).

In addition, spatially relative terms, such as "below", "below", "below", "above", "above", etc., may be used herein for convenience of description to describe the position of one element or feature with respect to other elements or features. the relationship shown. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that in this article, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims (10)

1. The multi-address identification method is based on a 555 circuit and is characterized by comprising the following steps of:

the method comprises the steps that address pre-stored tables of a plurality of communication slaves are preset in a communication bus;

setting a resistance value of a resistor or a capacitance value of a capacitor of each communication slave machine connected into the 555 circuit;

the 555 circuit outputs a square wave corresponding to the resistor or the capacitor;

and acquiring the high level time or the square wave period of the square wave, and finding out the address of the corresponding communication slave machine on the address pre-stored table according to the high level time or the square wave period.

2. The multi-address identification method of claim 1, wherein the 555 circuit comprises a first resistor, a second resistor, a first capacitor, a pulse generator and a power supply voltage, wherein a power input end of the first resistor is electrically connected with the power supply voltage, a power output end of the first resistor is respectively electrically connected with a power input end of the second resistor and the pulse generator, a power output end of the second resistor is electrically connected with a power input end of the first capacitor and the pulse generator, and the other end of the first capacitor is grounded;

wherein either the first resistor or the second resistor is configured as the resistor to which the communication slave accesses the 555 circuit;

alternatively, the first capacitor is configured to be accessed by the communication slave to the capacitor of the 555 circuit.

3. The multi-address identification method of claim 2, further comprising the steps of:

when the first resistor is configured as the resistor of the 555 circuit, the 555 circuit outputs a first square wave corresponding to the first resistor, and the communication bus acquires the high level time of the first square wave and finds the address of the communication slave on the address pre-storing table correspondingly;

when the second resistor is configured as the resistor of the 555 circuit, the 555 circuit outputs a second square wave corresponding to the second resistor, and the communication bus acquires the square wave period of the second square wave and finds the address of the communication slave on the address pre-storing table;

when the first capacitor is configured as the capacitor of the 555 circuit, the 555 circuit outputs a third square wave corresponding to the first capacitor, and the communication bus acquires the square wave period of the third square wave and finds the address of the communication slave on the address pre-storing table.

4. The multi-address identification method of claim 2, further comprising the steps of:

the resistance value of the first resistor of the communication slaves increases progressively;

or, the second resistors of the communication slaves are increased in equal difference;

alternatively, the capacitance values of the first capacitances of the plurality of communication slaves are equally increased.

5. The method of claim 4, wherein the address of the communication slave is (90% -110%) of the value of the high level time or square wave period of the square wave corresponding thereto.

6. The multi-address recognition method according to claim 2, wherein the communication slave is provided with the first resistor, the second resistor or the first capacitor, and the communication slave is connected into the communication bus through an external connector, so that the first resistor, the second resistor or the first capacitor is connected into the 555 circuit.

7. The multi-address recognition method according to claim 1, wherein the step of obtaining the high level time of the square wave comprises the steps of:

the communication slave acquires the high level time of the square wave according to the primary rising edge interruption and the primary falling edge interruption of the io port;

the square wave period of the square wave is obtained by the following steps:

and the communication slave machine acquires the square wave period of the square wave according to the two rising edge interruption of the io port.

8. The multi-address recognition method according to claim 7, wherein the communication slave acquires the high level time or the square wave period through an input edge interrupt of an io port and an interrupt timing function of a timer or a capture function of a timer.

9. A communication system based on the multi-address identification method according to any one of claims 1-8, characterized in that the communication system comprises a battery-change cabinet and a plurality of batteries;

the battery changing cabinet is configured to be the communication bus, and the battery is configured to be the communication slave.

10. The communication system of claim 9, wherein the 555 circuit comprises the first resistor, the second resistor, and the first capacitor;

the battery replacing cabinet is provided with a plurality of charging cabins, the first resistor, the second resistor or the first capacitor is arranged in the charging cabins, and the battery is detachably connected in the charging cabins and electrically connected with the first resistor, the second resistor or the first capacitor.

Images