CN105472782A - Wireless communication terminal - Google Patents
Wireless communication terminal Download PDFInfo
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- CN105472782A CN105472782A CN201511004494.1A CN201511004494A CN105472782A CN 105472782 A CN105472782 A CN 105472782A CN 201511004494 A CN201511004494 A CN 201511004494A CN 105472782 A CN105472782 A CN 105472782A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Abstract
The invention discloses a wireless communication terminal. The wireless communication terminal comprises a serial port communication extension controller, as well as an MCU and a ZIGBEE module which are coupled with the serial port communication extension controller, wherein communication serial ports used for connecting peripheral equipment communication modules are arranged on the serial port communication extension controller; the ZIGBEE module is connected with the serial port communication extension controller, and used for transmitting instructions and receiving data; the MCU is connected with the serial port communication extension controller, receiving the instructions transmitted by the ZIGBEE module, sending the instructions to the peripheral equipment communication modules, and then receiving and sending the data transmitted by the peripheral equipment communication modules to the ZIGBEE module; one serial port of the MCU is extended to two serial ports via the serial port communication extension controller; and the serial port communication extension controller is used for controlling on/off and switching of the communication serial ports. The wireless communication terminal is used for converting communication modes, and transmitting the instructions and the data; moreover, as the original serial port of the MCU is extended to the two serial ports via the serial port communication extension controller, the cost is reduced.
Description
Technical field
The present invention relates to communication device technical field, particularly relate to a kind of single UART mouth be extended to multichannel UART mouth wireless communication terminal.
Background technology
8 traditional MCU or 32 MCU, when resource is more limited, often only have 1 UART serial interface, cannot meet many communication interfaces simultaneously needs carry out using when communicating.When cost requirement is stricter, often select small-sized single-chip microcomputer as Themaincontroller, the STM8S003 single-chip microcomputer of such as ST company, only have 1 UART interface and some GPIO mouths, when needs with this chip be used as external wireless communication communicate with outside 485 time, just cannot meet two kinds of interfaces to use simultaneously, need to carry out a series of conversion, the most conventional scheme changes inhomogeneous communication mode into same communication mode, such as by most transducer, all be converted to 485 communication modes, UART signal is converted to 485 communication modes by MCU, connect multiple 485 communication equipments simultaneously, the address bit carried out in communication protocol is determined simultaneously, do like this and will add fatware difficulty and the complexity that communicates relative to other transducer or communication equipment.Simultaneously by R&D cycle whole for impact and increase product cost.
If select the MCU with two UART, then by GPIO unnecessary for waste, the cost of such chip will increase several times simultaneously, cause unnecessary waste.
In the MCU of single UART communication interface, a kind of GPIO mouth can be adopted to simulate the communication mode of UART, the major defect changing mode is the increase in code operation amount, be not easy to safeguard and use, the real work efficiency of MCU will be affected, and which is not easy to adopt C language to write to carry out code, and the stronger language of the real-times such as compilation must be adopted to write simultaneously, assembler language is not received by existing code engineer substantially, therefore can reduce the quality of whole exploitation.
Summary of the invention
The object of this invention is to provide a kind of wireless communication terminal, MCU UART mouth, for changing communication modes transfer instruction and data, wherein by serial communication extending controller, is expanded to 2 road UART mouths and uses by this wireless communication terminal, cost-saving.
For solving the problem, the embodiment of the present invention provides a kind of wireless communication terminal, multichannel UART mouth is extended to for single UART mouth, MCU, ZIGBEE module comprising serial communication extending controller and couple with serial communication extending controller, described serial communication extending controller is provided with the communication serial ports for connecting ancillary equipment communication module, serial communication extending controller comprises
Multichannel MCU receiver module, couple MCU, ZIGBEE module and ancillary equipment communication module, for MCU, ancillary equipment sendaisle is selected, described ancillary equipment comprises ZIGBEE module and ancillary equipment communication module, receive multiple ancillary equipment send the transmission signal of pin TXD and transfer to MCU, when the waveform that one of them ancillary equipment sends the waveform of signal and the reception pin RXD of MCU in the same way time, then the receive path of MCU and the sendaisle of this ancillary equipment carry out communication;
Multichannel MCU sending module, couple MCU, ZIGBEE module and ancillary equipment communication module, for MCU, ancillary equipment receive path is selected, receive MCU send the transmission signal of pin TXD and transfer to each ancillary equipment, when the waveform that MCU sends the waveform of signal and the reception pin RXD of one of them ancillary equipment in the same way time, then the sendaisle of MCU and the receive path of this periphery carry out communication.
Optionally, described MCU comprises 1 UART mouth and four GPIO mouths, four described GPIO mouths are respectively the enable control mouth of ZIGBEE module receive path, the enable control mouth of ZIGBEE module sendaisle, the enable control mouth of ancillary equipment communication module receive path, the enable control mouth of ancillary equipment communication module sendaisle, the enable control mouth of described ZIGBEE module receive path is connected with ZIGBEE module communication with the enable control mouth of described ZIGBEE module sendaisle, the enable control mouth of described ancillary equipment communication module receive path is connected with the communication of ancillary equipment communication module with the enable control mouth of described ancillary equipment communication module sendaisle.
Optionally, described multichannel MCU receiver module comprises ZIGBEE sending module and ancillary equipment communication sending module, described ZIGBEE sending module and described ancillary equipment communication sending module include the first negater circuit and the second negater circuit, described first negater circuit and the second negater circuit adopt and are connected in series, first negater circuit of ZIGBEE sending module and the connected node of the second negater circuit are provided with the enable control mouth of ZIGBEE module sendaisle, first negater circuit of ancillary equipment communication sending module and the connected node of the second negater circuit are provided with the enable control mouth of ancillary equipment communication module sendaisle.
Optionally, first negater circuit of described ZIGBEE sending module comprises the 4th triode, first biasing resistor, one end of described first biasing resistor couples the emitter of described 4th triode, the other end couples the base stage of the 4th triode, the base stage of the 4th triode couples the transmitting pin TXD of ZIGBEE module by a resistance, grounded emitter, collector electrode couples the second negater circuit, described second negater circuit comprises the second triode, the base stage of described second triode couples the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of MCU and couples MCU supply voltage by a pull-up resistor.
Optionally, first negater circuit of described ancillary equipment communication sending module comprises the 8th triode, second biasing resistor, one end of described second biasing resistor couples the emitter of described 8th triode, the other end couples the base stage of the 8th triode, the base stage of the 8th triode couples the transmitting pin TXD of ancillary equipment communication module by a resistance, grounded emitter, collector electrode couples the second negater circuit, described second negater circuit comprises the 6th triode, the base stage of described 6th triode couples the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of MCU and the collector electrode of the second triode.
Optionally, described multichannel MCU sending module comprises ZIGBEE receiver module and ancillary equipment communication receiver module, described ZIGBEE receiver module and described ancillary equipment communication receiver module include the first negater circuit and the second negater circuit, described first negater circuit and the second negater circuit adopt and are connected in series, first negater circuit of ZIGBEE receiver module and the connected node of the second negater circuit are provided with the enable control mouth of ZIGBEE module receive path, first negater circuit of ancillary equipment communication receiver module and the connected node of the second negater circuit are provided with the enable control mouth of ancillary equipment communication module receive path.
Optionally, first negater circuit of described ZIGBEE receiver module comprises the 3rd triode, 3rd biasing resistor, one end of described 3rd biasing resistor couples the emitter of described 3rd triode, the other end couples the base stage of the 3rd triode, the base stage of the 3rd triode couples the transmitting pin TXD of MCU by a resistance, grounded emitter, collector electrode couples the second negater circuit, described second negater circuit comprises the first triode, the base stage of described first triode couples the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of ZIGBEE module and couples MCU supply voltage by a pull-up resistor.
Optionally, first negater circuit of described ancillary equipment communication receiver module comprises the 7th triode, 4th biasing resistor, one end of described 4th biasing resistor couples the emitter of described 7th triode, the other end couples the base stage of the 7th triode, the base stage of the 7th triode couples the transmitting pin TXD of MCU by a resistance, grounded emitter, collector electrode couples the second negater circuit, described second negater circuit comprises the first triode, the base stage of described first triode couples the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of ancillary equipment communication module and couples MCU supply voltage by a pull-up resistor.
Compared with prior art, the technical program has the following advantages:
By the Channel-shifted of serial communication extending controller, the interface communication of multiple UART can be realized, if the GPIO interface of monolithic is more than enough, different UART communication interface conversions can be realized, and whether conversion flexibility ratio is very high, do not need the communication interface mode taking notice of ancillary equipment consistent.Even if some equipment have employed RS485 or RS232 interface mode and deposits, also can by such circuit conversion mode carry out relevant between communication; And in the mutual conversion process of UART each time, the basic setup of UART can be carried out, comprise communication baud rate and inspection, can be inconsistent.Really achieve UART serial ports to transform flexibly, expand, the requirement in all circuit of multiple communication interface of substantially satisfying the demand communication.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the wireless communication terminal of the embodiment of the present invention;
Fig. 2 is the circuit diagram of the serial communication extending controller of the embodiment of the present invention;
Fig. 3 is the circuit diagram of MCU and the ZIGBEE module of the wireless communication terminal of the embodiment of the present invention.
Accompanying drawing marks: A1, ZIGBEE sending module; A2, ancillary equipment communication sending module; B1, ZIGBEE receiver module; B2, ancillary equipment communication receiver module; 1, MCU; 2, ZIGBEE module.
Embodiment
Below in conjunction with accompanying drawing, by specific embodiment, clear, complete description is carried out to technical scheme of the present invention.
As shown in Figures 1 to 3, wireless communication terminal of the present invention comprises MCU1, ZIGBEE module 2 and serial communication extending controller.The resource that MCU is minimum needs to possess 1 UART mouth and 4 GPIO, UART mouth is used for communicating with ancillary equipment, 4 GPIO mouths are as the enable control mouth switching peripheral UART communication interface, and the level signal of 4 GPIO mouths switches for the signalling channel of serial communication extending controller inside.MCU UART mouth, for changing communication modes transfer instruction and data, wherein by serial communication extending controller, is expanded to 2 road UART mouths and uses by this wireless communication terminal, cost-saving.
The operation principle of this wireless communication terminal: ZIGBEE module 2 is connected with serial communication extending controller, for transfer instruction, receives data; MCU1 is connected with serial communication extending controller, be extended to 2 road serial ports by serial communication extending controller, receive the instruction that ZIGBEE module 2 is transmitted, issue ancillary equipment communication module, MCU1 receives the data of ancillary equipment communication module transmission again, sends ZIGBEE module 2 to; Serial communication extending controller is used for switch and the switching of communication control serial ports.
ZIGBEE module 2 initiatively sends after instruction receives instruction to MCU1, MCU1 and is transferred to ancillary equipment communication module again, and MCU1 receives the data that peripheral communication module transmits, then sends ZIGBEE module 2 to; MCU1 adopts time-sharing multiplex mode, and certain interval of time carries out serial ports switching, when ZIGBEE module 2 is for a long time without instruction, sends instruction to ancillary equipment communication module, receives data of its transmission and store.
As shown in Figure 2, serial communication extending controller comprises 2 road MCU receiver modules and 2 road MCU sending modules, is respectively: (1) ZIGBEE module sends, and MCU receives; (2) ancillary equipment communication module sends, and MCU receives; (3) MCU sends, and ZIGBEE module receives; (4) MCU sends, and ancillary equipment communication module receives.
The operation principle of four modules is identical with structure, includes the first negater circuit and the second negater circuit that are connected in series.The connected node of the first negater circuit and the second negater circuit is provided with the enable control mouth of ZIGBEE module or ancillary equipment communication module.First negater circuit comprises a triode, a biasing resistor, the two ends of biasing resistor couple emitter and the base stage of triode respectively, the base stage of triode couples the transmitting pin TXD of ZIGBEE module or ancillary equipment communication module by a resistance or receives pin RXD, grounded emitter, collector electrode couples the second negater circuit.Second negater circuit comprises a triode, pull-up resistor, a filter capacitor, the base stage of triode couples the output of the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of MCU and couples MCU supply voltage by pull-up resistor, filter capacitor is located at the output of second direction circuit, for filtering and the rectification of output waveform.
Output due to ZIGBEE sending module A1 and ancillary equipment communication sending module A2 all couples the reception pin RXD of MCU, consider the reasons such as cost-saving, directly be connected with the output of ZIGBEE sending module A1 by the output of wire by ancillary equipment communication sending module A2, two public pull-up resistors of module and filter capacitor.
Each module switches serial communication by the level changing each enable control mouth, when ZIGBEE module and MCU communication, closes the serial communication of ancillary equipment communication module and MCU; Equally, as MCU and the communication of ancillary equipment communication module, close the serial communication of ZIGBEE module and MCU.
Label is the intrinsic UART interface (TXD be expressed as the transmission serial ports of communication, RXD be expressed as the reception serial ports of communication) of MCU_TXD and MCU_RXD as MCU.Label is the UART interface of ZIGBEE_TXD and ZIGBEE_RXD as first via communication equipment ZIGBEE module.Label is the UART interface of POWER_TXD and POWER_RXD as No. second communication equipment ancillary equipment communication module.Label is the enable control mouth of ZIGBEE_TXD_EN and ZIGBEE_RXD_EN as ZIGBEE module UART interface, is connected with two GPIO mouths of MCU.Label is the enable control mouth of POWER_TXD_EN and POWER_RXD_EN as the UART interface of ancillary equipment communication module, is connected with two GPIO mouths of MCU.
2 road MCU receiver modules (ZIGBEE module sends or ancillary equipment communication module sends, and MCU receives, ancillary equipment TXD channel selecting):
The ZIGBEE sending module A1 that triode Q4 and triode Q2 forms is that ZIGBEE_TXD sends, MCU_RXD receiving path; The ancillary equipment communication sending module A2 that triode Q8 and triode Q6 forms is that POWER_TXD sends, MCU_RXD receiving path.
Work as ZIGBEE_TXD_EN=1, during POWER_TXD_EN=0, the collector electrode of triode Q4 will have a collector bias resistance, a bias voltage is provided, under now triode Q4 is operated in reverser output state, the output waveform of ZIGBEE_TXD is carried out oppositely, due to ZIGBEE_TXD_EN=1, under then triode Q2 is in normal switch state, when ZIGBEE_TXD is carried out the base stage of the Waveform Input oppositely to triode Q2 by triode Q4, then the output waveform of the collector electrode of triode Q4 is carried out oppositely by triode Q2 again, now, the waveform of ZIGBEE_TXD and MCU_RXD in the same way, MCU can normally receive this Serial Port Information.
Due to POWER_TXD_EN=0, then the collector bias voltage of triode Q8 is 0V, and cause the base voltage of triode Q6 to be 0V forever, triode Q6 is in closed condition always, even if now POWER_TXD has shape information, also cannot be transferred on MCU_RXD.
Work as ZIGBEE_TXD_EN=0, during POWER_TXD_EN=1, the collector electrode of triode Q8 will have a collector bias resistance, a bias voltage is provided, under now triode Q8 is operated in reverse output state, the output waveform of POWER_TXD is carried out oppositely, due to POWER_TXD_EN=1, under then triode Q6 is in normal switch state, when POWER_TXD is carried out the base stage of the Waveform Input oppositely to triode Q6 by triode Q8, then the output waveform of the collector electrode of triode Q8 is carried out oppositely by triode Q6 again, now, the waveform of POWER_TXD and MCU_RXD in the same way, MCU can normally receive this Serial Port Information,
Due to ZIGBEE_TXD_EN=0, then the collector bias voltage of triode Q4 is 0V, and cause the base voltage of triode Q2 to be 0V forever, triode Q2 is in closed condition always, even if now ZIGBEE_TXD has shape information, also cannot be transferred on MCU_RXD.
Because this wireless communication terminal is based on ZIGBEE module, ancillary equipment communication module is auxiliary, and two array signal processings, interval switches, so there are not two modules to send identical information simultaneously.
2 road MCU sending modules (MCU sends, and ancillary equipment communication module receives or ZIGBEE module receives, and MCU is to ancillary equipment RXD channel selecting):
The ZIGBEE receiver module B1 that triode Q3 and triode Q1 forms is that MCU_TXD sends, ZIGBEE_RXD receiving path, and the ancillary equipment communication receiver module B2 that triode Q7 and triode Q5 forms is that MCU_TXD sends, POWER_RXD receiving path.
Work as ZIGBEE_RXD_EN=1, during POWER_RXD_EN=0, the collector electrode of triode Q3 will have a collector bias resistance, a bias voltage is provided, under now triode Q3 is operated in reverser output state, the output waveform of MCU_TXD is carried out oppositely, due to ZIGBEE_RXD_EN=1, under then triode Q1 is in normal switch state, when MCU_TXD is carried out the base stage of the Waveform Input oppositely to triode Q1 by triode Q3, then the output waveform of the collector electrode of triode Q3 is carried out oppositely by triode Q1 again, now, the waveform of MCU_TXD and ZIGBEE_RXD in the same way, ZIGBEE module can normally receive this Serial Port Information.
Due to POWER_RXD_EN=0, then the collector bias voltage of triode Q7 is 0V, and cause the base voltage of triode Q5 to be 0V forever, triode Q5 is in closed condition always, even if now MCU_TXD has shape information, also cannot be transferred on POWER_RXD.
Work as ZIGBEE_RXD_EN=0, during POWER_RXD_EN=1, the collector electrode of triode Q7 will have a collector bias resistance, a bias voltage is provided, under now triode Q7 is operated in reverse output state, the output waveform of MCU_TXD is carried out oppositely, due to POWER_RXD_EN=1, under then triode Q5 is in normal switch state, when MCU_TXD is carried out the base stage of the Waveform Input oppositely to triode Q5 by triode Q7, then the output waveform of the collector electrode of triode Q7 is carried out oppositely by triode Q5 again, now, the waveform of MCU_TXD and POWER_RXD in the same way, ancillary equipment communication module can normally receive this Serial Port Information.
Due to ZIGBEE_RXD_EN=0, then the collector bias voltage of triode Q3 is 0V, and cause the base voltage of triode Q1 to be 0V forever, triode Q1 is in closed condition always, even if now MCU_TXD has shape information, also cannot be transferred on ZIGBEE_RXD.
By such circuit conversion, the interface communication of multiple UART can be realized, if the GPIO interface of monolithic is more than enough, different UART communication interface conversions can be realized, and whether conversion flexibility ratio is very high, do not need the communication interface mode taking notice of ancillary equipment consistent.Even if some equipment have employed RS485 or RS232 interface mode and deposits, also can by such circuit conversion mode carry out relevant between communication; And in the mutual conversion process of UART each time, the basic setup of UART can be carried out, comprise communication baud rate and inspection, can be inconsistent.Really achieve UART serial ports to transform flexibly, expand, the requirement in all circuit of multiple communication interface of substantially satisfying the demand communication.
Due to above operation principle, as long as the I/O line that MCU selection 4 is common and a UART communication port, the expansion of serial communication passage can be completed, also can meet the requirement of different serial port setting simultaneously, switch arbitrarily in the demand of different serial port setting, add reliability and the autgmentability of circuit.Simultaneously because UART is paired appearance usually, namely TXD and RXD works simultaneously, so RXD_EN and TXD_EN of same equipment can be adopted an I/O control, so also can save the hardware resource of monolithic.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (8)
1. a wireless communication terminal, multichannel UART mouth is extended to for single UART mouth, it is characterized in that, MCU, ZIGBEE module comprising serial communication extending controller and couple with serial communication extending controller, described serial communication extending controller is provided with the communication serial ports for connecting ancillary equipment communication module, serial communication extending controller comprises
Multichannel MCU receiver module, couple MCU, ZIGBEE module and ancillary equipment communication module, for MCU, ancillary equipment sendaisle is selected, described ancillary equipment comprises ZIGBEE module and ancillary equipment communication module, receive multiple ancillary equipment send the transmission signal of pin TXD and transfer to MCU, when the waveform that one of them ancillary equipment sends the waveform of signal and the reception pin RXD of MCU in the same way time, then the receive path of MCU and the sendaisle of this ancillary equipment carry out communication;
Multichannel MCU sending module, couple MCU, ZIGBEE module and ancillary equipment communication module, for MCU, ancillary equipment receive path is selected, receive MCU send the transmission signal of pin TXD and transfer to each ancillary equipment, when the waveform that MCU sends the waveform of signal and the reception pin RXD of one of them ancillary equipment in the same way time, then the sendaisle of MCU and the receive path of this periphery carry out communication.
2. wireless communication terminal as claimed in claim 1, it is characterized in that, described MCU comprises 1 UART mouth and four GPIO mouths, four described GPIO mouths are respectively the enable control mouth of ZIGBEE module receive path, the enable control mouth of ZIGBEE module sendaisle, the enable control mouth of ancillary equipment communication module receive path, the enable control mouth of ancillary equipment communication module sendaisle, the enable control mouth of described ZIGBEE module receive path is connected with ZIGBEE module communication with the enable control mouth of described ZIGBEE module sendaisle, the enable control mouth of described ancillary equipment communication module receive path is connected with the communication of ancillary equipment communication module with the enable control mouth of described ancillary equipment communication module sendaisle.
3. wireless communication terminal as claimed in claim 2, it is characterized in that, described multichannel MCU receiver module comprises ZIGBEE sending module and ancillary equipment communication sending module, described ZIGBEE sending module and described ancillary equipment communication sending module include the first negater circuit and the second negater circuit, described first negater circuit and the second negater circuit adopt and are connected in series, first negater circuit of ZIGBEE sending module and the connected node of the second negater circuit are provided with the enable control mouth of ZIGBEE module sendaisle, first negater circuit of ancillary equipment communication sending module and the connected node of the second negater circuit are provided with the enable control mouth of ancillary equipment communication module sendaisle.
4. wireless communication terminal as claimed in claim 3, it is characterized in that, first negater circuit of described ZIGBEE sending module comprises the 4th triode, first biasing resistor, one end of described first biasing resistor couples the emitter of described 4th triode, the other end couples the base stage of the 4th triode, the base stage of the 4th triode couples the transmitting pin TXD of ZIGBEE module by a resistance, grounded emitter, collector electrode couples the second negater circuit, described second negater circuit comprises the second triode, the base stage of described second triode couples the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of MCU and couples MCU supply voltage by a pull-up resistor.
5. wireless communication terminal as claimed in claim 4, it is characterized in that, first negater circuit of described ancillary equipment communication sending module comprises the 8th triode, second biasing resistor, one end of described second biasing resistor couples the emitter of described 8th triode, the other end couples the base stage of the 8th triode, the base stage of the 8th triode couples the transmitting pin TXD of ancillary equipment communication module by a resistance, grounded emitter, collector electrode couples the second negater circuit, described second negater circuit comprises the 6th triode, the base stage of described 6th triode couples the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of MCU and the collector electrode of the second triode.
6. wireless communication terminal as claimed in claim 2, it is characterized in that, described multichannel MCU sending module comprises ZIGBEE receiver module and ancillary equipment communication receiver module, described ZIGBEE receiver module and described ancillary equipment communication receiver module include the first negater circuit and the second negater circuit, described first negater circuit and the second negater circuit adopt and are connected in series, first negater circuit of ZIGBEE receiver module and the connected node of the second negater circuit are provided with the enable control mouth of ZIGBEE module receive path, first negater circuit of ancillary equipment communication receiver module and the connected node of the second negater circuit are provided with the enable control mouth of ancillary equipment communication module receive path.
7. wireless communication terminal as claimed in claim 6, it is characterized in that, first negater circuit of described ZIGBEE receiver module comprises the 3rd triode, 3rd biasing resistor, one end of described 3rd biasing resistor couples the emitter of described 3rd triode, the other end couples the base stage of the 3rd triode, the base stage of the 3rd triode couples the transmitting pin TXD of MCU by a resistance, grounded emitter, collector electrode couples the second negater circuit, described second negater circuit comprises the first triode, the base stage of described first triode couples the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of ZIGBEE module and couples MCU supply voltage by a pull-up resistor.
8. wireless communication terminal as claimed in claim 6, it is characterized in that, first negater circuit of described ancillary equipment communication receiver module comprises the 7th triode, 4th biasing resistor, one end of described 4th biasing resistor couples the emitter of described 7th triode, the other end couples the base stage of the 7th triode, the base stage of the 7th triode couples the transmitting pin TXD of MCU by a resistance, grounded emitter, collector electrode couples the second negater circuit, described second negater circuit comprises the first triode, the base stage of described first triode couples the first negater circuit by a resistance, grounded emitter, collector electrode couples the reception pin RXD of ancillary equipment communication module and couples MCU supply voltage by a pull-up resistor.
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| CN108257622A (en) * | 2018-03-06 | 2018-07-06 | 宁波向往智能科技有限公司 | A kind of charging management system of background music host |
| CN110182085A (en) * | 2019-06-12 | 2019-08-30 | 深圳驿普乐氏科技有限公司 | A kind of charging pile of noninductive identification and its control method of authorization charging |
| CN113076269A (en) * | 2021-02-26 | 2021-07-06 | 杭州涂鸦信息技术有限公司 | Serial port expansion circuit and electronic device |
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| US20090029656A1 (en) * | 2006-02-09 | 2009-01-29 | Thierry Sicard | Lin bus network, integrated circuit and method of communicating thereon |
| CN201378876Y (en) * | 2009-02-08 | 2010-01-06 | 青岛海信移动通信技术股份有限公司 | Handheld communication terminal |
| CN101969515A (en) * | 2010-10-27 | 2011-02-09 | 郑州新德力工贸有限公司 | Wireless audio and video early warning terminal device |
| CN102545953A (en) * | 2012-02-27 | 2012-07-04 | 上海中科高等研究院 | UART (Universal Asynchronous Receiver/Transmitter) function extension circuit and control method thereof |
| CN205249496U (en) * | 2015-12-28 | 2016-05-18 | 浙江方大智控科技有限公司 | Wireless communication terminal |
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| CN106023575A (en) * | 2016-06-15 | 2016-10-12 | 长沙瑞斯康通信技术有限公司 | Communication method and system of II type collector |
| CN108257622A (en) * | 2018-03-06 | 2018-07-06 | 宁波向往智能科技有限公司 | A kind of charging management system of background music host |
| CN110182085A (en) * | 2019-06-12 | 2019-08-30 | 深圳驿普乐氏科技有限公司 | A kind of charging pile of noninductive identification and its control method of authorization charging |
| CN113076269A (en) * | 2021-02-26 | 2021-07-06 | 杭州涂鸦信息技术有限公司 | Serial port expansion circuit and electronic device |
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