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458 communication circuit

A communication circuit and circuit technology, applied in the direction of electrical components, transmission systems, etc., can solve the problem of less use, achieve the effect of preventing electromagnetic radiation, ensuring safe operation, and suppressing electromagnetic radiation

Inactive Publication Date: 2017-06-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

RS485 has two types of wiring, two-wire system and four-wire system. The four-wire system is a full-duplex communication method, but it is rarely used. The two-wire system is a half-duplex communication method.

Method used

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  • 458 communication circuit

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0015] Such as figure 1 A 458 communication circuit shown includes a 458 communication chip, a sub-circuit for removing common-mode interference, a driving sub-circuit, an information input circuit, an optocoupler and a communication terminal, and also includes a TVS tube. The sub-circuit for removing common-mode interference , the driving sub-circuit, the information input circuit and the optocoupler are respectively electrically connected to the 458 communication chip, and the 458 communication chip is connected to the communication terminal through the TVS tube.

[0016] Wherein, the 458 commun...

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PUM

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Abstract

The invention discloses a 458 communication circuit which comprises a 458 communication chip, a common-mode interference removal sub-circuit, a driving sub-circuit, an information input circuit, an optical coupler, a communication end and TVS tubes, wherein the common-mode interference removal sub-circuit, the driving sub-circuit, the information input circuit and the optical coupler are respectively electrically connected with the 458 communication chip; and the 458 communication chip is also connected with the communication end by the TVS tubes. According to the 458 communication circuit disclosed by the invention, the common-mode interference removal sub-circuit can effectively ensure that a common-mode voltage is in a range of minus 7 to plus 12V; and by two TVS tubes, damage to original components, which is caused by an excessively large current, is prevented.

Description

technical field [0001] The invention relates to the technical field of communication electronics, in particular to a 458 communication circuit. Background technique [0002] The RS-485 communication interface configured by the energy meter adopts the principle of differential circuit, which expands the multi-point application where the driver and the receiver share the same line, allowing 32 drivers and 32 receivers to be connected to the same line to form a switch together. Install the communication line. The communication logic is differential signal negative logic, +2V~+6V means "1", and -6V~-2V means "0". RS485 has two types of wiring, two-wire system and four-wire system. The four-wire system is a full-duplex communication method, but it is rarely used, and the two-wire system is a half-duplex communication method. [0003] The half-duplex network composed of the RS485 interface in the energy meter is generally a two-wire system, and shielded twisted-pair wires are mo...

Claims

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Application Information

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IPC IPC(8): H04B1/40H04B1/525
CPCH04B1/40H04B1/525
Inventor 徐易朗吴言
Owner CHONGQING UNIV