CN114301814A - Method for realizing 485 communication with multiple products based on polling mode - Google Patents
Method for realizing 485 communication with multiple products based on polling mode Download PDFInfo
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- CN114301814A CN114301814A CN202111507453.XA CN202111507453A CN114301814A CN 114301814 A CN114301814 A CN 114301814A CN 202111507453 A CN202111507453 A CN 202111507453A CN 114301814 A CN114301814 A CN 114301814A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 claims abstract description 34
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Abstract
The invention provides a method for realizing 485 communication with a plurality of products based on a polling mode, which is realized based on a DSP, a 485 communication chip, a differential driver and a differential receiver, wherein a plurality of differential drivers and differential receivers form a plurality of differential group communication channels in a one-to-one correspondence manner, and the working states of the plurality of differential drivers and the differential receivers are sequentially controlled through the output level of an I/O port of the DSP, so that the working states of a plurality of groups of communication channels are controlled, communication between one test device and a plurality of products is realized in a polling mode, and the number of the plurality of the drivers is at least two. The hardware resource waste is overcome, and the testing efficiency is improved. Belongs to the technical field of industrial control communication.
Description
Technical Field
The invention relates to a method for realizing 485 communication with a plurality of products based on a polling mode, belonging to the technical field of industrial control communication.
Background
A certain product requires a total of 40 hours of aging testing during the production process. During the aging process, the test equipment continuously monitored the self-test information of the product at 1 second intervals. The time for the test equipment to read the product self-test information once is 5 ms. The test equipment communicates with a product to be tested through a 485 bus, and a differential driver is connected to a 485 chip sending end to convert a sending signal into a differential signal for outputting; and the receiving end is connected with a differential receiver, and the differential signal is converted into a single-path signal for receiving. Currently used is the way that one test apparatus monitors one product, the schematic diagram of which is shown in fig. 2. The method has the problems of hardware resource waste and low test efficiency.
Disclosure of Invention
The invention provides a method for realizing 485 communication with a plurality of products based on a polling mode, which aims to overcome hardware resource waste and improve test efficiency.
In order to achieve the purpose, the method for achieving 485 communication with a plurality of products based on a polling mode is adopted, and is achieved based on a DSP, a 485 communication chip, a differential driver and a differential receiver, wherein the differential driver and the differential receiver form a plurality of differential group communication channels in a one-to-one correspondence mode, the working states of the differential driver and the differential receiver are sequentially controlled through an I/O (input/output) port output level of the DSP, so that the working states of the plurality of groups of communication channels are controlled, communication between one test device and the plurality of products is achieved in a polling mode, and the number of the plurality of the devices is at least two.
In the method, when the test equipment needs to communicate with the first product, the first differential driver is enabled through the I/O port of the DSP, the test board sends a command to the first product, the first differential driver is enabled after the command is sent, the first differential driver is enabled, the first differential receiver receives data returned by the first product through the first I/O enabled differential receiver of the DSP, the first differential receiver is disabled after the data is received, and the communication method of the test equipment and other products is the same as that of the first product.
In the method, the DSP judges the time for finishing the sending enabling and the receiving enabling by reading the data sending identification bit and the data receiving identification bit of the 485 chip.
In the method, the test equipment realizes 485 communication with 10 products based on a polling mode, the communication time of the test equipment and each product is 5ms, the total communication time of 10 products is 50ms, and the requirement of finishing communication with 10 products within 1s is met.
Compared with the prior art, the invention can monitor ten products by one test device, has test efficiency ten times that of the prior method, avoids the waste of hardware resources, greatly improves the test efficiency and has extremely high practical application value.
Drawings
FIG. 1 is a communication schematic of the present invention;
fig. 2 is a communication schematic diagram of a prior art method.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.
Examples
Referring to fig. 1, this embodiment provides a method for implementing 485 communication with 10 products based on a polling manner, where the method is implemented based on a DSP, a 485 communication chip, a differential driver and a differential receiver, where 10 differential drivers and 10 differential receivers form 10 groups of communication channels, and the operating states of the 10 differential drivers and 10 differential receivers are sequentially controlled through an output level of an I/O port of the DSP, so as to control the operating states of the 10 groups of communication channels, and implement communication between a test device and 10 products in a polling manner, when the test device needs to communicate with the first product, first enabling the first differential driver through the I/O port of the DSP, sending a command to the first product by a test bench, ending enabling the first differential driver after the command is sent, and enabling the first differential receiver to receive data returned by the first product through the I/O port of the DSP, after data receiving is finished, the enabling of the differential receiver is cancelled, the communication method of the test equipment and the other 9 products is the same as that of the product I, the test equipment realizes 485 communication with 10 products based on a polling mode, the communication time of the test equipment and each product is 5ms, the total time of 10 product communication is 50ms, and the requirement of finishing the communication with 10 products within 1s is met.
The DSP judges the time for finishing the sending enabling and the receiving enabling by reading the data sending identification bit and the data receiving identification bit of the 485 chip, when the test equipment is communicated with a product to be tested, the test equipment is communicated with the product at one time, the product does not participate in the communication, the corresponding differential driver and the receiver need to be closed and enabled through an I/O port of the DSP, otherwise, the communication is interfered.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A method for realizing 485 communication with a plurality of products based on a polling mode is characterized in that: the method is realized on the basis of a DSP (digital signal processor), a 485 communication chip, a differential driver and a differential receiver, wherein a plurality of differential drivers and differential receivers form a plurality of differential group communication channels in a one-to-one correspondence manner, and the working states of the plurality of differential drivers and the differential receivers are sequentially controlled through the output level of an I/O (input/output) port of the DSP, so that the working states of a plurality of groups of communication channels are controlled, communication between one test device and a plurality of products is realized in a polling manner, and the number of the plurality of the differential drivers is at least two.
2. The method of claim 1, wherein the method comprises the following steps: when the test equipment needs to communicate with the first product, the first differential driver is enabled through the I/O port of the DSP, the test board sends a command to the first product, the first differential driver is enabled after the command is sent, the first differential driver is received through the first I/O enabled differential receiver of the DSP, the first differential receiver is disabled after the data is received, and the communication method of the test equipment and other products is the same as that of the first product.
3. The method of claim 1, wherein the method comprises the following steps: the DSP judges the time for finishing the sending enabling and the receiving enabling by reading the data sending identification bit and the data receiving identification bit of the 485 chip.
4. The method of claim 1, wherein the method comprises the following steps: the test equipment realizes 485 communication with 10 products based on a polling mode, the communication time of the test equipment and each product is 5ms, the total time of 10 product communication is 50ms, and the requirement of completing the communication with 10 products within 1s is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111507453.XA CN114301814A (en) | 2021-12-10 | 2021-12-10 | Method for realizing 485 communication with multiple products based on polling mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111507453.XA CN114301814A (en) | 2021-12-10 | 2021-12-10 | Method for realizing 485 communication with multiple products based on polling mode |
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| CN114301814A true CN114301814A (en) | 2022-04-08 |
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| CN202111507453.XA Pending CN114301814A (en) | 2021-12-10 | 2021-12-10 | Method for realizing 485 communication with multiple products based on polling mode |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070126431A1 (en) * | 2005-12-06 | 2007-06-07 | Honeywell International Inc. | Dynamically switched line and fault detection for differential signaling systems |
| CN201039215Y (en) * | 2007-05-10 | 2008-03-19 | 广州数控设备有限公司 | A serial communication and decoding device |
| CN103428051A (en) * | 2013-08-29 | 2013-12-04 | 普联技术有限公司 | System and method for testing communication devices |
| CN107908584A (en) * | 2017-11-30 | 2018-04-13 | 四川泛华航空仪表电器有限公司 | A kind of 485 communication networks of multichannel RS |
| CN210327615U (en) * | 2019-07-25 | 2020-04-14 | 杭州勤诚微电子科技有限公司 | Communication circuit |
-
2021
- 2021-12-10 CN CN202111507453.XA patent/CN114301814A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070126431A1 (en) * | 2005-12-06 | 2007-06-07 | Honeywell International Inc. | Dynamically switched line and fault detection for differential signaling systems |
| CN201039215Y (en) * | 2007-05-10 | 2008-03-19 | 广州数控设备有限公司 | A serial communication and decoding device |
| CN103428051A (en) * | 2013-08-29 | 2013-12-04 | 普联技术有限公司 | System and method for testing communication devices |
| CN107908584A (en) * | 2017-11-30 | 2018-04-13 | 四川泛华航空仪表电器有限公司 | A kind of 485 communication networks of multichannel RS |
| CN210327615U (en) * | 2019-07-25 | 2020-04-14 | 杭州勤诚微电子科技有限公司 | Communication circuit |
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