CN208754289U - TTL serial ports no-delay communicating circuit in parallel - Google Patents
TTL serial ports no-delay communicating circuit in parallel Download PDFInfo
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- CN208754289U CN208754289U CN201821555973.1U CN201821555973U CN208754289U CN 208754289 U CN208754289 U CN 208754289U CN 201821555973 U CN201821555973 U CN 201821555973U CN 208754289 U CN208754289 U CN 208754289U
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Abstract
The utility model discloses a kind of TTL serial ports no-delay communicating circuits in parallel, and sending module includes several transmission units, connect external microcontroller by single TTL serial ports after each transmission unit is in parallel；Receiving module include with the one-to-one receiving unit of transmission unit, external microcontroller is connected by single TTL serial ports after each receiving unit is in parallel；Each transmission unit forms a communication unit with corresponding receiving unit and connects a sensor；In communication, external microcontroller carries out data interaction by communication unit and the sensor of connection；When a transmission unit in sending module is in transmission state, other transmission units are in off state, and receiving unit corresponding with the transmission unit of transmission state is in is in pull-up reception state.The TTL serial ports that external microcontroller may be implemented in the utility model can be communicated directly with multiple sensors；Circuit structure is simple, and does not need interface conversion and communicate and be not delayed.
Description
Technical field
The utility model relates to communicating circuit technical field more particularly to a kind of TTL serial ports no-delay communication electricity in parallel
Road.
Background technique
Microcontroller is if necessary to the sensor module with various TTL interfaces in embedded systems, such as temperature and humidity, liquid crystal
And if optical sensor etc. communicates.The general scheme using 485 chips of extension at present, i.e., the interface each sensor
485 interfaces are extended to by TTL, then are connected together, to realize that the same interface of CPU can be with multiple sensor communications.But
It is this scheme using 485 chips of extension, often plus a kind of sensor device is it is necessary to add a piece of 485 communication chip, not only significantly
Circuit structure complexity is improved, and since there are interface conversions, communication is caused to be delayed.
Utility model content
TTL serial ports provided by the utility model no-delay communicating circuit in parallel, main purpose are to overcome existing side
Case causes circuit structure complicated, there are problems that communication delay.
In order to solve the above technical problems, the utility model adopts the following technical solution:
A kind of TTL serial ports no-delay communicating circuit in parallel, including sending module and receiving module；
The sending module includes several transmission units, is connected after each transmission unit is in parallel by single TTL serial ports
Connect external microcontroller；
The receiving module includes and the one-to-one receiving unit of the transmission unit that each receiving unit is in parallel
External microcontroller is connected by single TTL serial ports afterwards；
Each transmission unit forms a communication unit with the corresponding receiving unit and connects a sensor；?
When communication, external microcontroller carries out data interaction by communication unit and the sensor of connection；
When a transmission unit in the sending module is in transmission state, other described transmission units, which are in, to be cut
Only state, and receiving unit corresponding with the transmission unit of transmission state is in is in pull-up reception state.
As an embodiment, the sending module further includes the first anti-jamming circuit；
The first anti-interference unit is connect with the parallel connected end of the TTL serial ports of external microcontroller and transmission unit respectively.
As an embodiment, first anti-jamming circuit includes resistance R1 and two-way transient diode T1；
The TTL serial ports of one end of the resistance R1 and external microcontroller connects, the other end respectively with two-way two pole of transient state
The anode of pipe T1 is connected with the parallel connected end of transmission unit；
The cathode of the two-way transient diode T1 is grounded.
As an embodiment, each receiving unit include receiving subelement and with the receiving subelement string
The diode of connection, the cathode of the diode are connect with the output end of the receiving subelement.
As an embodiment, the receiving module further includes the second anti-jamming circuit；
The second anti-interference unit is connect with the parallel connected end of the TTL serial ports of external microcontroller and receiving unit respectively.
As an embodiment, second anti-jamming circuit includes resistance R2 and two-way transient diode T2；
The TTL serial ports of one end of the resistance R2 and external microcontroller connects, the other end respectively with two-way two pole of transient state
The anode of pipe T2 is connected with the parallel connected end of receiving unit；
The cathode of the two-way transient diode T2 is grounded.
As an embodiment, the working condition of the sending module and receiving module is by external microcontroller
Serial ports configuration determines.
Compared with prior art, the technical program has the advantage that
TTL serial ports provided by the utility model no-delay communicating circuit in parallel is gone here and there in a TTL of external microcontroller
Multiple communication units are set on mouthful, and each communication unit is connected with sensor.And each communication unit by transmission unit and
Corresponding receiving unit composition, when a transmission unit in sending module is in transmission state, other transmission units are located
In off state, and receiving unit corresponding with the transmission unit of transmission state is in is in pull-up reception state, so as to
It realizes that a TTL serial ports current time all only can carry out data interaction with a sensor, allows external microcontroller straight
It connects and is communicated with multiple sensors；Circuit structure is simple, and does not need interface conversion and communicate and be not delayed.
Detailed description of the invention
Fig. 1 is the schematic diagram for the TTL serial ports no-delay communicating circuit in parallel that the utility model embodiment one provides；
Fig. 2 is the data waveform schematic diagram that the first transmission unit is sent；
Fig. 3 is the potential diagram that the second transmission unit is sent to N transmission unit；
Fig. 4 is the received data waveform schematic diagram of external microcontroller.
In figure: 1, sending module；11, the first transmission unit；2, receiving module；3, external microcontroller；4, sensor.
Specific embodiment
Below in conjunction with attached drawing, the above and other technical features and advantages of the present invention are carried out clearly and completely
Description, it is clear that described embodiment is only the section Example of the utility model, rather than whole embodiments.
Referring to Fig. 1, the TTL serial ports no-delay communicating circuit in parallel that the utility model embodiment one provides, including hair
Send module 1 and receiving module 2；Sending module 1 includes several transmission units, is gone here and there after each transmission unit is in parallel by single TTL
Mouth connection external microcontroller 3；Receiving module 2 include with the one-to-one receiving unit of transmission unit, each receiving unit is simultaneously
External microcontroller 3 is connected by single TTL serial ports after connection；Each transmission unit and corresponding receiving unit form a communication
Unit connects a sensor 4；In communication, external microcontroller 3 carries out data friendship by the sensor 4 that communication unit connects
Mutually；When a transmission unit in sending module 1 is in transmission state, other transmission units are in off state, and with
The corresponding receiving unit of transmission unit in the state of transmission is in pull-up reception state.
It should be noted that sending module 1 includes at least two transmission units, the quantity of transmission unit determines corresponding connect
The quantity of unit is received, and each transmission unit and receiving unit form a communication unit.Communication unit can extend always,
That is if to be communicated with four sensors 4, as long as four communication units of setting.It is between transmission unit
Parallel with one another, it is connect after in parallel with the end TXD of a TTL serial ports of external microcontroller 3, and between receiving unit it is also phase
It is mutually in parallel, it is connect after in parallel with the end RXD of a TTL serial ports of external microcontroller 3；That is 3 needs of external microcontroller mention
For 1 TTL serial ports, so that it may with multiple 4 Direct Communications of sensor.
In order to make communication normally the working condition to transmission unit and receiving unit alternately be needed to configure, specifically
For, when a transmission unit in sending module 1 is in transmission state, other transmission units are in off state, and with
The corresponding receiving unit of transmission unit in the state of transmission is in pull-up reception state.Above-mentioned configuration can be directly in outside
The mode for sending data to TTL serial ports in microcontroller 3 configures.It is, the work of sending module 1 and receiving module 2
State is configured by the serial ports of external microcontroller 3 and is determined.For example, the work side at the end TXD (transmitting terminal) of external microcontroller 3
Formula is configured to push-pull output mode, and the end RXD (receiving end) is all to input upper pull-mode.Therefore, the transmission of external microcontroller 3
Data directly can be received directly by all receiving ends.That is it can only be communicated every time with a sensor 4, other
Sensor 4 is in off state.When needing to communicate multiple sensors 4, can be carried out with poll.
Need to be arranged a reversed cut-off in receiving unit, when the receiving end low level signal of receiving unit cannot transmit
To the receiving end of TTL serial ports.There can be circuit realization, for example, each receiving unit includes receiving subelement and single with son is received
The concatenated diode of member, the cathode of diode and the output end of receiving subelement connect.In this present embodiment, by the way that Xiao Te is arranged
Based diode can be realized.That is each receiving subelement includes a diode and a receiving subelement.
TTL serial ports provided by the utility model no-delay communicating circuit in parallel, in a TTL of external microcontroller 3
Multiple communication units are set on serial ports, and each communication unit is connected with sensor 4.And each communication unit is by transmission unit
It is formed with corresponding receiving unit, when a transmission unit in sending module 1 is in transmission state, other transmission units are equal
In off state, and receiving unit corresponding with the transmission unit of transmission state is in is in pull-up reception state, so as to
To realize that a TTL serial ports current time all only can carry out data interaction with a sensor 4, so that external microcontroller 3 can
It is communicated with direct with multiple sensors 4；Circuit structure is simple, and does not need interface conversion and communicate and be not delayed.
Some transmission unit in sending module 1 is selected to send data, other transmission units are in off state.It will send
For unit with the first to N name, corresponding receiving unit is also with the first to N name.So when sending module 1 sends data
When.For example, since the transmitting terminal level of the first transmission unit 11 is 1, being received with first when the first transmission unit 11 sends out bit1
The level of the external microcontroller 3 of unit connection is also 1 due to carrying pull-up resistor；When the first transmission unit 11 is sent
When bit0, transmission unit end level is 0, due to having connect the cathode of Schottky diode, 3 serial ports receiving end of external microcontroller
Voltage will be pulled low to 0.3V (pressure drop of Schottky diode is 0.3V), the electricity of the second receiving unit to N receiving unit
Flat to have added a backward dioded, waveform is unaffected.When the waveform of the transmission of external microcontroller 3 data is 010010 as a result,
The received waveform of receiving module 2 is 010010.Specific waveform, as shown in Fig. 2, Fig. 3 and Fig. 4.
It can be seen that: the received waveform of external microcontroller 3, initial level have 0.3V, are because having concatenated a Xiao Te
Based diode (pressure drop 0.3V), but being properly received for external microcontroller 3 is not influenced, because external microcontroller 3 can be IO
Voltage 1.5V or less is judged as logical zero level, so data waveform and final external micro-control that the first transmission unit 11 is sent
The received waveform of device 3 processed is completely the same, and the waveform of other modules is unaffected, and it is also such that other units, which send data,.Such as
Fruit is directly connected to all be connected together all receiving ends, and such as the first transmission unit 11 sends 0 data of position (bit), it
The end IO to drag down originally, but because the IO of other transmission unit is push pull mode, may not drag down, number
Fail according to sending.It can be seen that device is simple after having added this programme between external microcontroller 3 and sensor 4, interface without
Change, realizes the Direct Communication between each sensor 4 or equipment, and data are not delayed.
In order to increase the anti-interference of communication, sending module further includes the first anti-jamming circuit；First anti-interference unit point
It is not connect with the parallel connected end of the TTL serial ports of external microcontroller 3 and transmission unit.First anti-jamming circuit includes resistance R1 and double
To transient diode T1；One end of resistance R1 is connect with the TTL serial ports of external microcontroller 3, the other end respectively with two-way transient state
The anode of diode T1 is connected with the parallel connected end of transmission unit；The cathode of two-way transient diode T1 is grounded.Resistance R1's plays
Impedance matching effect, can also play the Anti-Jamming to high voltage spikes.Two-way transient diode T1 can be to high pressure
Spike is absorbed, and Anti-Jamming is played.
The anti-interference communicated in order to further increase, receiving module 2 further include the second anti-jamming circuit；Second is anti-interference
Unit is connect with the parallel connected end of the TTL serial ports of external microcontroller 3 and receiving unit respectively.Second anti-jamming circuit includes resistance
R2 and two-way transient diode T2；One end of resistance R2 is connect with the TTL serial ports of external microcontroller 3, the other end respectively with it is double
It is connected to the anode of transient diode T2 with the parallel connected end of receiving unit；The cathode of two-way transient diode T2 is grounded.Resistance R2
The Anti-Jamming for playing the role of impedance matching, can also playing to high voltage spikes.Two-way transient diode T2 can be with
High voltage spikes are absorbed, Anti-Jamming is played.
Although the utility model has been described by way of example and in terms of the preferred embodiments, but it is not to appoint for limiting the utility model
What those skilled in the art without departing from the spirit and scope of the utility model, may be by the method and skill of the disclosure above
Art content makes possible variation and modification to technical solutions of the utility model, therefore, all without departing from the utility model technology
The content of scheme, it is made by the above technical examples according to the technical essence of the present invention it is any it is simple modification, equivalent variations and
Modification, belongs to the protection scope of technical solutions of the utility model.
Claims (7)
1. a kind of TTL serial ports no-delay communicating circuit in parallel, which is characterized in that including sending module and receiving module；
The sending module includes several transmission units, outer by the connection of single TTL serial ports after each transmission unit is in parallel
Portion's microcontroller；
The receiving module include with the one-to-one receiving unit of the transmission unit, lead to after each receiving unit is in parallel
Cross single TTL serial ports connection external microcontroller；
Each transmission unit forms a communication unit with the corresponding receiving unit and connects a sensor；It is communicating
When, external microcontroller carries out data interaction by communication unit and the sensor of connection；
When a transmission unit in the sending module is in transmission state, other described transmission units are in cut-off shape
State, and receiving unit corresponding with the transmission unit of transmission state is in is in pull-up reception state.
2. TTL serial ports as described in claim 1 no-delay communicating circuit in parallel, which is characterized in that the sending module is also
Including the first anti-jamming circuit；
The first anti-interference unit is connect with the parallel connected end of the TTL serial ports of external microcontroller and transmission unit respectively.
3. TTL serial ports as claimed in claim 2 no-delay communicating circuit in parallel, which is characterized in that described first is anti-interference
Circuit includes resistance R1 and two-way transient diode T1；
The TTL serial ports of one end of the resistance R1 and external microcontroller connects, the other end respectively with two-way transient diode T1
Anode connected with the parallel connected end of transmission unit；
The cathode of the two-way transient diode T1 is grounded.
4. TTL serial ports as described in claim 1 no-delay communicating circuit in parallel, which is characterized in that each reception is single
Member include receiving subelement and with the concatenated diode of the receiving subelement, the cathode of the diode and receptions son list
The output end connection of member.
5. TTL serial ports as described in claim 1 no-delay communicating circuit in parallel, which is characterized in that the receiving module is also
Including the second anti-jamming circuit；
The second anti-interference unit is connect with the parallel connected end of the TTL serial ports of external microcontroller and receiving unit respectively.
6. TTL serial ports as claimed in claim 5 no-delay communicating circuit in parallel, which is characterized in that described second is anti-interference
Circuit includes resistance R2 and two-way transient diode T2；
The TTL serial ports of one end of the resistance R2 and external microcontroller connects, the other end respectively with two-way transient diode T2
Anode connected with the parallel connected end of receiving unit；
The cathode of the two-way transient diode T2 is grounded.
7. TTL serial ports as described in claim 1 no-delay communicating circuit in parallel, which is characterized in that the sending module and
The working condition of receiving module is configured by the serial ports of external microcontroller and is determined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821555973.1U CN208754289U (en) | 2018-09-21 | 2018-09-21 | TTL serial ports no-delay communicating circuit in parallel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821555973.1U CN208754289U (en) | 2018-09-21 | 2018-09-21 | TTL serial ports no-delay communicating circuit in parallel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208754289U true CN208754289U (en) | 2019-04-16 |
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ID=66084640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821555973.1U Active CN208754289U (en) | 2018-09-21 | 2018-09-21 | TTL serial ports no-delay communicating circuit in parallel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208754289U (en) |
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2018
- 2018-09-21 CN CN201821555973.1U patent/CN208754289U/en active Active
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