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Communication method of half duplex serial bus with clock singal and communication system

A serial bus and clock signal technology, which is applied in the transmission system, duplex signal operation, electrical components, etc., can solve the problems of long communication delay time between contacts and poor real-time communication system

Inactive Publication Date: 2009-08-26
天津市英克瑞电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present invention aims at the defects that the communication system established based on the RS485 standard is not suitable for the transmission of digital information in industrial control, the delay time of the communication between the contacts is long, and the real-time performance of the communication system is poor, and provides a simple, efficient and suitable for small industrial Half-duplex serial bus communication method with clock signal for controlling digital information transmission in network, and communication system using the method

Method used

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  • Communication method of half duplex serial bus with clock singal and communication system
  • Communication method of half duplex serial bus with clock singal and communication system
  • Communication method of half duplex serial bus with clock singal and communication system

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Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: Half-duplex serial bus communication method with clock signal:

[0048] Such as Figure 1-10 As shown, the present invention mainly sets forth the communication protocol of the data link layer of the field bus, and there is no clear regulation for the design principle of the underlying physical layer hardware circuit, that is, the personnel who use this communication protocol can use different methods to realize the design of the hardware circuit .

[0049] Similarly, the present invention does not have clear regulations on the upper layer protocol, that is, the personnel using the communication protocol can define the meaning of the data transmitted on the bus according to the actual use situation.

[0050] The structure of the communication system of the present invention is as follows: figure 1 As shown, its communication methods include:

[0051] First, the definition

[0052] (1) Definition of serial bus signal:

[0053] Basic clock cycle: the re...

Embodiment 2

[0102] Embodiment 2, half-duplex serial bus communication system with clock signal

[0103] One) the composition of the serial bus communication system device that the present invention designs, see figure 1 .

[0104] 1) Four-wire system, that is, two pairs of unshielded twisted-pair wires, defined as follows:

[0105] Line 1: The first wire of the first twisted pair: DC power supply +24V;

[0106] Line 2: The second line of the first twisted pair: DC power ground, ie 0V;

[0107] Line 3: the first line of the second twisted pair: serial clock signal SCLK;

[0108] Line 4: the second line of the second twisted pair: serial data signal SDAT;

[0109] 2) Bus power supply: provide working power for the communication contacts connected to the bus.

[0110] 3) Terminal circuit: The signal transmitted in the bus is a digital quantity. In order to prevent the signal from being reflected at the circuit terminal and causing interference, a terminal absorption circuit can be used ...

Embodiment 3

[0125] Embodiment 3, the application of the present invention in elevator external signal control

[0126] The application block diagram of the present invention in the elevator external input and output signals, see Figure 15 .

[0127] Usually an elevator has multiple floors (indicated by an integer M, M≥2), and each floor hall has some input or output signals, for example, there are up call buttons and indicators on the lowest floor (called outbound call button indicators ), fire switch, elevator lock switch, etc. There are up / down call buttons and indicators on the middle floor, and down call buttons and indicators on the top floor.

[0128] Corresponding to the number M of elevator floors, there are M internal selection buttons and indicators on the control panel in the elevator car.

[0129] When the elevator is running, it needs to continuously collect and update the outgoing call and internal selection signals, because these signals are discrete switch signals. If t...

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Abstract

The invention relates to a communication system and method for a small industrial control network. Half-duplex serial bus communication system with clock signal, including master, slave, serial communication bus, serial communication bus includes: power line, common ground line, data line and clock line 4 wires, serial communication bus The two ends are respectively connected to the terminal circuit, and the host and the slave are respectively connected to the serial communication bus through the interface circuit. The communication method is as follows: each of the N communication slaves connected on the shared serial bus is determined to use the address number as the unique identification code of the slave; Receive periodic exchange information; each slave performs data exchange with the master according to the corresponding identification code in the frame structure sent by the master. This communication system adopts half-duplex data communication. The initiation and termination of data communication is controlled by the master, and it can exchange data with all slaves. The communication is periodic, and the communication delay between contacts is definite.

Description

【Technical field】: [0001] The invention relates to a communication system and method for a small industrial control network. 【Background technique】: [0002] At present, in small industrial control networks, RS-232, RS-422 and RS-485 standards are the most widely used serial data interface standards, formulated and issued by the Electronic Industries Association (EIA), and are serial data interface standards. industry standard. [0003] The RS-232 standard is a full-duplex communication method with one-to-one connection at one end, and the serial communication port on the computer is this standard. [0004] In order to improve the shortcomings of short communication distance and low rate of RS-232, RS-422 defines a single-machine transmission, multi-machine reception simplex, balanced transmission specification, which is named as the TIA / EIA-422-A standard. [0005] In order to expand the scope of application, EIA formulated the RS-485 standard on the basis of RS-422 in 19...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L5/16
Inventor 张德军张德民
Owner 天津市英克瑞电子技术有限公司
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