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Interface conversion circuit and double-interface device

An interface conversion and circuit technology, applied in the field of interface conversion circuits and dual-interface devices, can solve the problems of signal transmission characteristics and echo characteristics, data transmission failure, resource waste, etc., and achieve the effect of reducing data transmission failures and low circuit cost.

Pending Publication Date: 2018-10-19
WUHAN SAN FRAN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing level conversion method mainly converts two different levels into a recognizable TTL level, but due to the signal transmission characteristics and echo characteristics of the M-BUS slave itself, the data transmission will fail.
At present, in order to improve this situation, it is proposed to install a high-cost processing unit such as a single-chip microcomputer between the level conversion devices, but this method needs to be supported by writing program codes, but only used for signal conversion between the two interfaces will consume resources. waste

Method used

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  • Interface conversion circuit and double-interface device
  • Interface conversion circuit and double-interface device
  • Interface conversion circuit and double-interface device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] see figure 1A schematic structural diagram of an interface conversion circuit 100 is shown, including: a first conversion unit 102 and a second conversion unit 104 electrically connected to each other; Unit 106; wherein, the first conversion unit 102 includes an RS-485 circuit, and the second conversion unit 104 includes an M-BUS slave circuit; the input end of the first conversion unit 102 is connected to the first interface for receiving the first interface The transmitted first differential signal converts the first differential signal into a first logic level signal, and sends the first logic level signal to the second conversion unit 104 and the control unit 106 respectively; the second conversion unit 104 is used to receive The first logic level signal converts the first logic level signal into a current signal, and sends the current signal to the second interface; wherein, when receiving the first logic level signal, the second conversion unit 104 converts the fi...

Embodiment 2

[0048] On the basis of the above embodiments, the present invention also provides a dual interface device, image 3 A schematic structural diagram of a dual-interface device is shown, which includes a first interface 302, an interface conversion circuit 100, and a second interface 304 connected in sequence; wherein, the interface conversion circuit 100 is the interface conversion circuit in Example 1.

[0049] In one embodiment, the first interface is an RS-485 interface, the second interface is an M-BUS host interface, the first interface and the interface conversion circuit are connected through the RS-485 bus, and the connection between the second interface and the interface conversion circuit is They are connected by M-BUS bus. The transmission between the first interface and the interface conversion circuit is a differential signal, the second interface sends a voltage signal to the interface conversion circuit, and the interface conversion circuit sends a current signal to...

Embodiment 3

[0052] On the basis of the above-mentioned embodiments, the embodiment of the present invention provides another schematic structural diagram of an interface conversion circuit, see Figure 4 , wherein the M-BUS bus is connected to the second conversion unit, the second conversion unit contains an M-BUS slave processing circuit, the RX pin of the second conversion unit is connected to the output terminal of the second inverter, and the second inverter The input end of the inverter is connected to the output end of the first inverter, the input end of the first inverter is respectively connected to the input end of the control unit and the RO pin of the first conversion unit, and the TX pin of the second conversion unit The input end of the control unit is respectively connected to the DI pin of the first conversion unit, the output end of the control unit is connected to the RE / DE pin of the first conversion unit, and the first conversion unit includes an RS-485 processing circ...

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Abstract

The invention provides an interface conversion circuit and a double-interface device, and relates to the technical field of interface conversion. The circuit comprises a first conversion unit and a second conversion unit, which are mutually connected electrically; the circuit further comprises a control unit, which is separately connected with the first conversion unit and the second conversion unit electrically, wherein the first conversion unit comprises an RS-485 circuit; and the second conversion unit comprises an M-BUS slave circuit. The control unit in the circuit can effectively reducethe data transmission failure condition due to the characteristics of the second conversion unit itself; furthermore, compared with the interface conversion device using a single chip micro-computer as the processing unit in the prior art, the circuit cost is relatively low; and furthermore, the resource waste phenomenon can be avoided.

Description

technical field [0001] The invention relates to the technical field of interface conversion, in particular to an interface conversion circuit and a dual interface device. Background technique [0002] my country's water, electricity, gas, heat and other metering managements belong to different management agencies, which correspond to different meter reading methods and management models. Due to the different meter reading methods, the communication interfaces corresponding to each metering management unit are different, so devices such as communication interface converters emerge as the times require. In the meter industry, RS-485 and M-BUS are two common communication interfaces. At present, the commonly used interface installation method is to use the M-BUS host interface to copy the data of the terminal equipment with the M-BUS slave interface, and the RS-485 interface to copy the data of the terminal equipment with the RS-485 interface. If the on-site RS-485 interface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L12/02
CPCH04L12/02H04L12/40032
Inventor 李中泽杨飞王伟张方方
Owner WUHAN SAN FRAN ELECTRONICS CO LTD