Signal transmission method and device based on micro-controller general asynchronous serial port

Technical Field

The invention relates to a signal communication field, in particular to a universal asynchronous Serial port based on single-chip signal transmitting method and device.

Background Art

In the prior art, universal asynchronous Serial port based on single-chip for data transmission (UART) (as shown in Figure 1), the characteristics of the Serial port to the shorter transmission distance, the anti-interference capability is poor, and the circuit is connected with polarity, if the line of the pump, can not work normally; at the same time the transmission is one of a butt joint, and can not realize two or more single chip is used for the multi-party communication. Because of the above-mentioned defect causing the Serial port communications can not be applied to the transmission line a long communication engineering. Although the generally adopted in communication engineering based on RS485 interface standard solutions, universal asynchronous Serial port can be overcome and the transmission distance is relatively short, such as poor anti-interference, however, the solution's hardware cost is high, and the circuit has the polarity connection.

Content of the invention

The aim of the invention is to overcome the above-mentioned shortcomings and deficiencies of the prior art, to provide a universal asynchronous Serial port based on single-chip signal transmission device, its long transmission distance, anti-interference is strong, and the circuit does not have polarity is connected in the one route of transmission on the bus at the same time can be connected more than two multi-communication of the equipment.

The aim of the invention is to provide the above-mentioned computer based on the signal of the common asynchronous Serial port signal transmission method of transmission device.

The purpose of this invention is realized through the following technical scheme: the universal asynchronous Serial port based on single-chip signal transmission device, which comprises sequentially with the modulation module, drive amplifying module, isolation transformer module, the audio decoding module, the modulation module with the transmission pin and the carrier are respectively connected with the signal output port, the single-chip audio decoding module is connected with the receiving pin; two or more than two of the universal asynchronous Serial port based on single-chip signal transmission device and the corresponding number of the single chip is respectively connected with, any two the single-chip microcomputer for the sending/receiving end of each other, any two of the isolation transformer module through the transmission between non-polarity connection of the bus line.

In order to better realize the invention, the universal asynchronous Serial port based on single-chip signal transmission device can be connected with the single chip computer through the connector, also can be directly the universal asynchronous Serial port based on single-chip signal transmission device and the single-chip microcomputer, the same block are arranged together on the circuit board PCB.

The transmission bus may be an ordinary telephone line, twisted pair cable or other similar implement.

The modulation module will send the foot of the single-chip microcomputer for carrier signal, and a transistor open-collector output and modulation on the signal.

Drive amplifying module adopts the capacitor blocking input, and triode for output in the form of forming the push-pull circuit.

Isolation transformer module adopts the high-frequency transformer, is connected to the signal to be transmitted on one side, the other side coupled to the transmission bus.

The audio decoding module can adopt LM567, NE567, SE567, BA1604 or BA1604F a realization in.

The above-mentioned computer based on the signal of the common asynchronous Serial port signal transmission method of transmission device, comprising the following steps:

Step (a): the modulation module of the sending end sends the sending end of the chip carrier signal output signal and the carrier wave signal output by the output port is modulated, the signal form a passband;

Step (b): the sending end amplifying module of driving the above-mentioned pass-band signal into drive transmitting terminal isolation transformer module electrical signal, sending end of the isolation transformer module the transmission device and transmission bus isolation, through the transmission bus at the same time the alternating current signal is sent to the receiving end of the isolation transformer module;

Step (c): of the receiving end of the isolation transformer module is transmitted over the transmission bus in the AC signal coupled, and transmission to the receiving end of the audio decoding module;

Step (d): the audio decoding module receiving the AC signal from the digital pulse signal, and the transmission to the receiving end of the receiving pin of the single-chip microcomputer, so as to complete universal asynchronous Serial port based on single-chip signal transmission.

Compared with the prior art, the present invention, has the following advantages and beneficial effects:

(1) because the universal asynchronous Serial port to the low-frequency digital pulse signal modulation to the high-frequency signal transmission, overcomes the defects that the general asynchronous Serial port more short defect of the transmission distance;

(2) due to the adoption of the fixed-frequency carrier communication, the data transmission has strong interference;

(3) because of the transmission is the AC frequency signal, the circuit connection of the present invention is non-polarity connection;

(4) due to the adoption of the carrier mode of communication, in the one route of transmission bus can be connected to the two or more than two transmission device for multi-party communication.

(5) the present invention has wide application range, is simple, practical, convenient installation and debugging, manufacturing, low maintenance cost, easy market promotion.

Description of drawings

Figure 1 is a structure diagram of the prior art.

Figure 2 is a structure diagram of the invention based on single-chip processor universal asynchronous Serial port to the signal transmission device.

Figure 3 is a structure diagram of the driving amplifier module circuit of the present invention universal asynchronous Serial port based on single-chip signal transmission device.

Mode of execution

Combination with the embodiments, the present invention as further detailed description, however, embodiments of the present invention is not limited to this.

Embodiment

As shown in Figure 2, the universal asynchronous Serial port based on single-chip signal transmission device, the modulation module comprises sequentially connected, drive amplifying module, isolation transformer module, the audio decoding module, the modulation module and the chip carrier signal, and the transmission pins are respectively connected to output ports, the audio decoding module receiving the single-chip is connected;

Two or more than two of the universal asynchronous Serial port based on single-chip signal transmission device and the corresponding number of the single chip is respectively connected with, any two the single-chip microcomputer for the sending/receiving end of each other, any two of the isolation transformer module through the transmission between non-polarity connection of the bus line, that is, the two the universal asynchronous Serial port based on single-chip signal transmission device and are transmitting/receiving terminal are respectively connected with the two one-chip computer, two of the isolation transformer module through the transmission between non-polarity connection of the bus line; if more than two or more one-chip computer communication need, a 3rd 3rd can be one or more one-chip computer or through the transmission device is connected to the transmission bus.

The signal transmission device can be connected with the single chip computer through the connector, can also be directly the transmission device and the single-chip microcomputer, the circuit of the circuit together with a block on the PCB.

The transmission bus can use a common telephone line, can also be with one-way twisted pair, the transmission bus can access a plurality of transmission device.

The modulation module will send the foot of the single-chip microcomputer for carrier signal, and a transistor open-collector output and modulation on the signal.

As shown in Figure 3, the driving amplifier module can adopt the capacitor blocking input, and for forming a push-pull circuit of the triode output.

The isolation transformer module can adopt the high-frequency transformer, is connected to the signal to be transmitted on one side, the other side coupled to the transmission bus.

The audio decoding module can be made of existing chip LM567 to realize, of course can also adopt the NE567, SE567, BA1604 or BA1604F to realize the existing chip.

The computer based on the signal of the common asynchronous Serial port in the signal transmission process of transmission device, comprising the following steps:

Step (a): the modulation module of the sending end of the sending end sends the foot of the (universal asynchronous Serial port) and the output signal of the output port of its carrier signal (universal I/O I) output of the modulated carrier signal, the signal form a passband;

Step (b): the sending end amplifying module of driving the above-mentioned pass-band signal into drive transmitting terminal isolation transformer module electrical signal, sending end of the isolation transformer module the transmission device and transmission bus isolation, through the transmission bus at the same time the alternating current signal is sent to the receiving end of the isolation transformer module;

Step (c): of the receiving end of the isolation transformer module is transmitted over the transmission bus in the AC signal coupled, and transmission to the receiving end of the audio decoding module;

Step (d): the audio decoding module receiving the AC signal from the digital pulse signal, and the transmission to the receiving end of the receiving pin of the single-chip microcomputer, so as to complete universal asynchronous Serial port based on single-chip signal transmission.

As mentioned above, can be preferably realizing the invention. The above-mentioned embodiment to the present invention a preferred implementation, however, embodiments of the present invention is not limited by the above embodiment, other any not depart from the spirit of this invention essence and principle of the changes made under, modified, alternative, combined, simplified, shall be in the equivalent permutation, are all contained in the scope of protection of this invention.