Method, system and equipment for carrying out data transmission through circuit of electric current loop

Abstract

The invention discloses method for carrying out data transmission by using circuit of electric current loop. The method includes steps: using double line to connect first device to second device; using connection of double line with second device, the first device forms positive going current loop, and sends data to the second device through the formed positive going current loop; using connection of double line with second device, the first device forms back current loop, and receives data sent from the second device through the formed back current loop. In the invention, communication party controls procedures for sending and receiving data so as to raise reliability of communication procedure. The invention reduces complexity of implemented circuit, and lowers cost of circuit, possessing large practicability.

Description

technical field [0001] The invention relates to digital communication technology, in particular to a method, system and equipment for data transmission using a current loop circuit. Background technique [0002] Currently, in order to realize long-distance digital communication, a current loop circuit is usually used on the line. The working principle of the current loop circuit is to transmit data through whether there is current in the current loop formed on the line. The use of current loop circuits to achieve communication has the advantages of low cost and strong anti-interference ability. Therefore, current loop circuits are widely used in various communication environments such as industrial communications. [0003] In the prior art, when using a current loop circuit for data transmission, a three-wire transmission mode is usually used. figure 1 It is a schematic diagram of data transmission using a current loop circuit in the prior art. see figure 1 , in the prio...

AI Technical Summary

Problems solved by technology

And because what adopt in the prior art is the three-wire transmission mode, that is, the first device of communication and the second device communicate through three current wires, like this, then must all need between every two current wires of these three current wires The process of adding a specific voltage limiting device needs to be performed three times in total, which increases the complexity of the circuit implementation and increases the circuit cost

Images