CN206178798U - Serial port communication expanding unit - Google Patents
Serial port communication expanding unit Download PDFInfo
- Publication number
- CN206178798U CN206178798U CN201620927479.8U CN201620927479U CN206178798U CN 206178798 U CN206178798 U CN 206178798U CN 201620927479 U CN201620927479 U CN 201620927479U CN 206178798 U CN206178798 U CN 206178798U
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- chip
- expanding unit
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- communication
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Abstract
The utility model relates to a serial port communication technical field, in particular to serial port communication expanding unit. The utility model discloses a data expanding unit is provided with power change -over switch, address decoder U1 and communication port switching circuit in this data expanding unit, power change -over switch chooses MOS pipe Q1 for use, and address decoder U1 chooses chip 74LS138 for use, and the communication port switching circuit includes digital control simulation electronic switch U2 and resistance R1, and digital control simulation electronic switch U2 chooses chip CD4051 for use, the utility model discloses in, address signal decodes from the input of chip 74LS138, and control MOS pipe Q1 carries out corresponding switching on to switch main communication port to corresponding communication port by chip CD4051 and communicate, thereby make the submodule piece can carry out remote communication, make it have very strong interference killing feature.
Description
Technical field
This utility model is related to technical field of serial communication, more particularly to a kind of serial communication expanding unit.
Background technology
Serial communication, refers to peripheral hardware and intercomputer, and by data signal line, ground wire, control line etc., step-by-step is transmitted
A kind of communication modes of data；The data wire that this communication mode is used is few, and communications cost can be saved in telecommunication,
But its transmission speed is lower than parallel transmission.
Serial line interface can receive to be converted to continuous serial data stream and go out from the parallel data character of CPU
Go, while can be parallel data character supply CPU by the converting serial data streams of acceptance.
The serial communication extension for often using at present has two kinds：1st, common 5V logic levels, circuit is simple, but cannot be multiple straight
Even, and long range poor anti jamming capability, 2,485 level are switched to, strong antijamming capability can be multiple direct-connected, but per being required for all the way
Special chip, complexity in circuits is high, relatively costly.
The content of the invention
Described above in order to overcome the shortcomings of, the purpose of this utility model is to provide a kind of serial communication expanding unit, its
Realize multichannel communication multiple telecommunication, and simple structure, long range strong antijamming capability, cost is than relatively low.
The technical scheme in the invention for solving the technical problem is：
A kind of serial communication expanding unit, the submodule connection of its serial communication, wherein, including expanding element, the expansion
Power change-over switch, address decoder U1 and port switching circuit are provided with exhibition unit；The power change-over switch is selected
Metal-oxide-semiconductor Q1, address decoder U1 select chip 74LS138, the port switching circuit to open including digital control simulation electronic
U2 and resistance R1 is closed, digital control simulant electronic switch U2 selects chip CD4051；The input and outfan of the submodule
The two ends of resistance R1 are connected to, one end of resistance R1 is connected with the D ends of metal-oxide-semiconductor Q1, the other end and chip of resistance R1
The pin 13 of CD4051 connects, and the S ends of metal-oxide-semiconductor are connected with the power supply that voltage is 5V, and the G ends of metal-oxide-semiconductor Q1 are with chip 74LS138's
Pin 15 connects.
As a kind of improvement of the present utility model, the earth terminal connection ground wire of the submodule.
In this utility model, address signal is input into into row decoding from chip 74LS138, and control metal-oxide-semiconductor Q1 is carried out accordingly
Conducting, and principal communication mouth switched to into corresponding port by chip CD4051 communicated, so that submodule can be with
Carry out telecommunication so as to very strong capacity of resisting disturbance.
Description of the drawings
For ease of explanation, this utility model is described in detail by following preferred embodiments and accompanying drawing.
Fig. 1 is internal circuit connection diagram of the present utility model.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain
This utility model, is not used to limit this utility model.
As shown in figure 1, a kind of serial communication expanding unit of the present utility model, the submodule connection of its serial communication.
A kind of serial communication expanding unit of the present utility model includes expanding element, and power supply switching is provided with expanding element
Switch, address decoder U1 and port switching circuit.
Power change-over switch selects metal-oxide-semiconductor Q1.
Address decoder U1 selects chip 74LS138.
Port switching circuit includes digital control simulant electronic switch U2 and resistance R1, digital control simulant electronic switch
U2 selects chip CD4051.
The input and outfan of submodule are connected to the two ends of resistance R1, one end of resistance R1 and the D of metal-oxide-semiconductor Q1
End connection, the other end of resistance R1 is connected with the pin 13 of chip CD4051, and the S ends of metal-oxide-semiconductor are connected with the power supply that voltage is 5V,
The G ends of metal-oxide-semiconductor Q1 are connected with the pin 15 of chip 74LS138.
Pipe Q1 controls corresponding power supply as power change-over switch, address signal after chip 74LS138 enters row decoding
Switch switch conduction, and principal communication mouth is switched to into corresponding port by chip CD4051 and communicated, can be with multiple straight
Even, multichannel communication multiple telecommunication is formed, with very strong capacity of resisting disturbance.
In this utility model, address signal is input into into row decoding from chip 74LS138, and control metal-oxide-semiconductor Q1 is carried out accordingly
Conducting, and principal communication mouth switched to into corresponding port by chip CD4051 communicated, so that submodule can be with
Carry out telecommunication so as to very strong capacity of resisting disturbance.
Further, the earth terminal connection ground wire of submodule so as to the more stable safety of communication.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit this utility model
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (2)
1. a kind of serial communication expanding unit, the submodule connection of its serial communication, it is characterised in that including expanding element, institute
State and be provided with expanding element power change-over switch, address decoder U1 and port switching circuit；The power change-over switch
From metal-oxide-semiconductor Q1, address decoder U1 selects chip 74LS138, the port switching circuit to include digital control simulation electricity
Son switch U2 and resistance R1, digital control simulant electronic switch U2 select chip CD4051；The input of the submodule and defeated
Go out the two ends that end is connected to resistance R1, one end of resistance R1 is connected with the D ends of metal-oxide-semiconductor Q1, the other end and core of resistance R1
The pin 13 of piece CD4051 connects, and the S ends of metal-oxide-semiconductor are connected with the power supply that voltage is 5V, G ends and the chip 74LS138 of metal-oxide-semiconductor Q1
Pin 15 connect.
2. a kind of serial communication expanding unit according to claim 1, it is characterised in that the earth terminal of the submodule connects
Earth lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620927479.8U CN206178798U (en) | 2016-08-24 | 2016-08-24 | Serial port communication expanding unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620927479.8U CN206178798U (en) | 2016-08-24 | 2016-08-24 | Serial port communication expanding unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206178798U true CN206178798U (en) | 2017-05-17 |
Family
ID=60240321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620927479.8U Expired - Fee Related CN206178798U (en) | 2016-08-24 | 2016-08-24 | Serial port communication expanding unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206178798U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108304339A (en) * | 2018-02-05 | 2018-07-20 | 南通职业大学(江苏省南通技师学院、江苏省南通市高级技工学校) | A kind of serial expanded circuit and its working method of dynamic managing and control system |
| CN117312216A (en) * | 2023-11-30 | 2023-12-29 | 国家海洋环境监测中心 | Serial port expansion circuit device and testing method |
-
2016
- 2016-08-24 CN CN201620927479.8U patent/CN206178798U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108304339A (en) * | 2018-02-05 | 2018-07-20 | 南通职业大学(江苏省南通技师学院、江苏省南通市高级技工学校) | A kind of serial expanded circuit and its working method of dynamic managing and control system |
| CN108304339B (en) * | 2018-02-05 | 2024-03-08 | 南通职业大学(江苏省南通技师学院、江苏省南通市高级技工学校) | Serial port expansion circuit of dynamic management and control system and working method thereof |
| CN117312216A (en) * | 2023-11-30 | 2023-12-29 | 国家海洋环境监测中心 | Serial port expansion circuit device and testing method |
| CN117312216B (en) * | 2023-11-30 | 2024-02-02 | 国家海洋环境监测中心 | Serial port expansion circuit device and testing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170517 Termination date: 20200824 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |