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RS422 asynchronous serial card with hardware timed sending function and communication method thereof

A RS-422, timing transmission technology, applied in the direction of instruments, electrical digital data processing, etc., can solve problems such as data frame loss, and achieve the effect of solving frame loss

Inactive Publication Date: 2012-03-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this kind of host computer software is running in a non-real-time operating system like Windows, it is easy to temporarily stop the cycle due to the reduction of priority, resulting in frame loss of regularly sent data

Method used

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  • RS422 asynchronous serial card with hardware timed sending function and communication method thereof
  • RS422 asynchronous serial card with hardware timed sending function and communication method thereof
  • RS422 asynchronous serial card with hardware timed sending function and communication method thereof

Examples

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specific Embodiment approach 1

[0017] Specific implementation mode one : combine figure 1 Describe this embodiment, the RS422 asynchronous serial card with hardware timing transmission function of this embodiment, it comprises RS-422 level conversion circuit 1, FPGA2, bus controller 3 and CPCI bus connector 4, solidify in the FPGA2 There are receiving module 21, sending module 22, first timer 23 and internal clock 24; The serial data output end of described RS-422 level conversion circuit 1 is connected to the serial data input end of receiving module 21, and the serial data input end of receiving module 21 The parallel data output end is connected to the data input end of the bus controller 3, the serial data input end of the RS-422 level conversion circuit 1 is connected to the serial data output end of the sending module 22, and the parallel data input end of the sending module 22 is connected to the bus controller The data output end of device 3, the bus data communication end of bus controller 3 conn...

specific Embodiment approach 2

[0020] Specific implementation mode two: The difference from Embodiment 1 is that in the RS422 asynchronous serial card with hardware timing sending function in this embodiment, the RS-422 level conversion circuit 1 is provided with n RS-422 level conversion units. The receiving module 21 is provided with n serial data input terminals, and the transmitting module 22 is provided with n serial data output terminals; the n serial data output terminals of the RS-422 level conversion circuit 1 are respectively connected to the n serial data output terminals of the receiving module 21 The serial data input terminals and the n serial data output terminals of the sending module 22 are respectively connected to the n serial data input terminals of the RS-422 level conversion circuit 1; wherein, n is a natural number, and n is greater than or equal to 1.

specific Embodiment approach 3

[0021] Specific implementation mode three: combine figure 2 To illustrate this embodiment, the difference from Embodiment 1 or 2 is that the RS422 asynchronous serial card with hardware timing sending function in this embodiment also includes an optocoupler circuit 5, and the optocoupler circuit 5 is connected in series at the RS-422 level Between the conversion circuit 1 and the receiving module 21, the serial data output end of the RS-422 level conversion circuit 1 is connected to the serial data input end of the receiving module 21 through the optocoupler circuit 5, and the serial data output end of the sending module 22 is passed through The optocoupler circuit 5 is connected to the serial data input end of the RS-422 level conversion circuit 1 .

[0022] The optocoupler circuit 5 is used to isolate and amplify the electrical signal output by the RS-422 level conversion circuit 1 . The optocoupler circuit 5 in this embodiment can improve the signal-to-noise ratio durin...

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Abstract

The invention discloses an RS422 asynchronous serial card with hardware timed sending function and a communication method thereof, which relate to an RS422 asynchronous serial card and a communication method thereof and solve the problem that the serial communication card in the current market sends data by adopting software timing to cause frame loss of the data. The RS422 asynchronous serial card comprises an RS-422 level converting circuit, an FPGA, a bus controller and a CPCI bus connector, wherein a receiving module, a transmitting module, a first timer and an internal clock are solidified in the FPGA. The communication method comprises the processes of receiving the data and transmitting the timed data. The problem of frame loss caused by a non-real-time operating system can be effectively solved by adopting a hardware caching method; and the RS422 asynchronous serial card and the communication method can be applied in the fields of controlling radars, radar simulators and numerical control turntables, monitoring the data and the like to finish setting the timed data and monitoring the timing state for the radars, the radar simulators, the numerical control turntables and the like.

Description

technical field [0001] The invention relates to an RS422 asynchronous serial card and a communication method thereof. Background technique [0002] When testing radar, a radar simulator that acts as a transponder is usually designed for testing. The radar simulator sends the simulated radar echo to the radar through the antenna, and the radar processes the echo data returned by the simulator to measure the current distance and speed. We will use the "scheduled data sending" function when setting the data of the radar simulator and when monitoring the data of the radar simulator and the radar itself. In addition, the control and state monitoring of the NC turntable also retrieve state information by sending control commands and monitoring commands regularly. Therefore, the serial communication card with timing function will be very necessary to complete the above functions. At present, the applications on the market generally use the software timer to complete the timing f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/38G06F13/40
Inventor 乔立岩马云彤赵欣刘通付宁彭喜元
Owner HARBIN INST OF TECH