CN110782645A - TTL bus communication system - Google Patents
TTL bus communication system Download PDFInfo
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- CN110782645A CN110782645A CN201911069064.6A CN201911069064A CN110782645A CN 110782645 A CN110782645 A CN 110782645A CN 201911069064 A CN201911069064 A CN 201911069064A CN 110782645 A CN110782645 A CN 110782645A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The invention discloses a TTL bus communication system, which is characterized in that when a concentrator sends a meter reading instruction, the concentrator is provided with the concentrator, an uplink RS485 wired remote transmission communication module and a downlink RS485 to TTL communication module, the uplink RS485 wired remote transmission communication module sends meter reading end data according to corresponding protocols, the downlink RS485 to TTL communication module carries out meter reading actions of different meter types according to instruction signals output after the uplink RS485 wired remote transmission communication module is converted, after the end responds, the downlink RS485 to TTL communication module stably collects the end data, and finally the end data is directly reported to the concentrator through TTL bus communication to complete the whole data transmission action, reduce the use of MCU master control in data communication, increase the stability of the system, and reduce the trouble of setting a plurality of complex serial port resources, therefore, the manufacturing cost of the equipment and the development cost of the software are saved, and the period of developing products is shortened.
Description
Technical Field
The present invention relates to the field of data communication technologies, and in particular, to a TTL bus communication system.
Background
In the prior art, mutual conversion of communication between RS485 communication and TTL signals or between M-Bus communication and TTL signals requires manually adding an MCU master control, and the master control also needs to be provided with a plurality of complex serial port resources so as to carry out conversion of interface signals, thereby not only increasing the manufacturing cost of equipment, but also increasing software developers to make software so as to prolong the period of developing products;
the existing conventional design method needs to increase the allocation of MUC master control when the communication of RS485 communication is converted into TTL signals or M-Bus communication is converted into TTL signals, after software runs off, the stability of the converted signals is not facilitated, the stability of the system is greatly reduced, the TTL Bus communication is adopted, MCU is not added for signal conversion, the use cost of the equipment is lowered, meanwhile, the communication baud rate self-adaption can be realized, and the stability of a hardware system is greatly increased.
Disclosure of Invention
In view of this, the present invention provides a TTL bus communication system, which reduces the use of MCU master control in data communication and can implement communication baud rate adaptation.
Based on the above object, the present invention provides a TTL bus communication system for a table side, including:
the concentrator is used for sending a meter reading instruction and receiving and processing data sent by a meter end;
the system comprises an uplink RS485 wired remote transmission communication module, a concentrator, a first RS485 signal level conversion circuit and a first RS485 signal enabling control circuit, wherein the uplink RS485 wired remote transmission communication module comprises a first RS485 chip, the first RS485 signal level conversion circuit and the first RS485 signal enabling control circuit, the first RS485 chip is used for converting an RS485 signal sent by the concentrator into a TTL signal, receiving a feedback signal of a meter end and returning the TTL signal to the concentrator, the first signal level conversion circuit is used for converting the TTL signal output by the first RS485 chip into a standard TTL level signal, and the first RS485 enabling control circuit is used for enabling the first RS485 chip;
the downlink RS485 to TTL communication module comprises a second RS485 chip, a second signal level conversion circuit and a second RS485 signal enable control circuit, the second RS485 chip is used for receiving meter reading signal TTL level signals output by the uplink RS485 wired remote transmission communication module, adjusting the meter reading signal TTL level signals into RS485 signals, outputting the RS485 signals to the meter end, receiving the RS485 signals uploaded by the meter end, converting the RS485 signals into TTL signals and outputting the TTL signals, and the second signal level conversion circuit converts the TTL signals output by the second RS485 chip into standard TTL level signals and returns the standard TTL level signals to the concentrator;
and the uplink RS485 wired remote transmission communication module and the downlink RS485 to TTL communication module are communicated through a TTL bus.
Preferably, the wireless remote transmission system further comprises an uplink wireless remote transmission communication module, which is used for converting an instruction of an electromagnetic field signal sent by the concentrator into an instruction of a TTL level signal, sending the TTL level signal to the meter end, converting TTL level data fed back by the meter end into electromagnetic field signal data, and sending the electromagnetic field signal data to the concentrator.
Preferably, the method further comprises the following steps:
the downlink M-Bus to TTL signal communication module comprises,
the third signal level conversion circuit is used for converting the digital signals into standard TTL level signals and transmitting the standard TTL level signals to the uplink RS485 wired remote transmission communication module.
Preferably, the uplink RS485 wired remote transmission communication module and the downlink RS485 to TTL communication module are in signal transmission in a transparent transmission mode.
Preferably, the first signal level conversion circuit is an optocoupler.
Preferably, the second signal level conversion circuit is a triode.
From the above, it can be seen that, in the TTL bus communication system provided by the present invention, by providing the concentrator, the uplink RS485 wired remote communication module and the downlink RS485 to TTL communication module, when the concentrator sends a meter reading instruction, the uplink RS485 wired remote communication module sends the meter reading data according to the corresponding protocol, the downlink RS485 to TTL communication module performs the meter reading operation of different meter types according to the instruction signal output by the uplink RS485 wired remote communication module after conversion, and when the meter end responds, the downlink RS485 to TTL communication module stably collects the meter reading data, and finally directly reports the meter reading data to the concentrator through the bus communication, thereby completing the whole data transmission operation, reducing the use of MCU master control in data communication, increasing the stability of the system, and reducing the trouble of setting a plurality of complex serial port resources, thereby saving the manufacturing cost of the device and the development cost of software, the product development period is shortened.
Drawings
Fig. 1 is an overall block diagram of a TTL bus communication system according to an embodiment of the present invention;
fig. 2 is a block diagram of a TTL bus communication system with multiple meter reading modes according to an embodiment of the present invention;
fig. 3 is a circuit schematic diagram of an uplink RS485 wired remote communication module according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a downlink RS485 to TTL communication module according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an uplink wireless remote communication module according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a downlink M-Bus to TTL signal communication module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
A TTL bus communication system is used for a meter end, and as shown in figure 1, the TTL bus communication system comprises a concentrator, an uplink RS485 wired remote transmission communication module and a downlink RS485 to TTL communication module, wherein the concentrator is used for sending a meter reading instruction and receiving and processing data sent by the meter end, the uplink RS485 wired remote transmission communication module comprises a first RS485 chip U18, a first signal level conversion circuit OP1 and a first RS485 signal enabling control circuit, the first RS485 chip is used for converting an RS485 signal sent by the concentrator into a TTL signal, receiving a feedback signal of the meter end and returning the TTL signal to the concentrator, the first signal level conversion circuit is used for converting the TTL signal output by the first RS485 chip into a standard TTL level signal TXD _ MBUS, and the first RS485 enabling control circuit is used for enabling the first RS485 chip;
the downlink RS485 to TTL communication module comprises a second RS485 chip U16, a second signal level conversion circuit and a second RS485 signal enable control circuit, the second RS485 chip is used for receiving meter reading signal TTL level signals output by the uplink RS485 wired remote transmission communication module through a network ZB _ RXD to be adjusted into RS485 signals, the RS485 signals are output to a meter end and received by the meter end to be converted into TTL signals to be output, the second signal level conversion circuit converts the TTL signals output by the second RS485 chip into standard TTL level signals to be returned to the concentrator, and the uplink RS485 wired remote transmission communication module and the downlink RS485 to TTL communication module are communicated through TTL buses.
By arranging the concentrator, the uplink RS485 wired remote transmission communication module and the downlink RS485 to TTL communication module, when the concentrator sends a meter reading instruction, the uplink RS485 wired remote transmission communication module sends meter reading end data according to corresponding protocols, the downlink RS485 to TTL communication module carries out meter reading actions of different meter types according to instruction signals output after the uplink RS485 wired remote transmission communication module is converted, after the end responds, the down RS485 TTL communication module collects the end data stably, and finally reports the end data to the concentrator directly through TTL bus communication to complete the whole data transmission action, reduce the use of MCU master control in data communication, increase the stability of the system, because the bus communication baud rate is self-adaptive, the trouble of setting a plurality of complex serial port resources is reduced, therefore, the manufacturing cost of the equipment and the development cost of the software are saved, and the period of developing products is shortened.
As an implementation manner, the system further includes an uplink wireless remote transmission communication module, configured to convert an instruction of an electromagnetic field signal sent by the concentrator into an instruction of a TTL level signal, send the TTL level signal to a meter end, convert TTL level data fed back by the meter end into electromagnetic field signal data, and send the electromagnetic field signal data to the concentrator.
As an implementation manner, the system further comprises a downlink M-Bus to TTL signal communication module, which comprises,
the meter reading device comprises an operational amplification chip, a third signal level conversion circuit and a band-pass filter circuit, wherein the band-pass filter circuit filters a signal returned by a meter end, the signal is amplified and compared by the operational amplification chip, and the signal is output as a digital signal, the third signal level conversion circuit is used for converting the digital signal into a standard TTL level signal and transmitting the standard TTL level signal to the uplink RS485 wired remote transmission communication module, and meter reading is completed.
Specifically, the band-pass filter circuit is composed of an RC, the third signal level conversion circuit is a triode Q040, when the concentrator sends a meter reading instruction to a meter end (a photoelectric direct-reading meter) through an uplink RS485 wired remote communication module, through TTL level signals modulated by the first RS485 chip and the first signal level conversion circuit, after the meter end responds, signals returned by the meter end pass through a network M-Bus +, and then pass through the band-pass filter circuit composed of the RC, the collected analog signals of the meter end are amplified and compared through the U014 operational amplifier chip, digital signals are output at a fourth pin of the chip, the analog signals are converted into standard TTL levels through the triode Q040 and transmitted to the uplink RS485 or wireless remote transmission module through the network RXD _ MBUS, meter data are returned to the concentrator, and meter reading is completed.
As an implementation mode, the uplink RS485 wired remote transmission communication module and the downlink RS485 to TTL communication module perform signal transmission in a transparent transmission manner. The compatibility of the device is improved, and the problem of stability of meter reading under a complex field environment is solved.
As shown in fig. 3, when the concentrator sends a meter reading instruction to the meter end through the uplink RS485 wired remote communication module, (since 485 of 2-wire system, the sending and receiving are all two wires which are shared and cannot simultaneously send and receive), at this time, U18 receives the meter reading instruction from the concentrator through the 6 th pin and the 7 th pin of the chip, the chip converts the RS485 signal into a TTL signal and outputs the TTL signal through the first pin, the level is converted into a standard TTL level signal TXD _ MBUS through the optical coupler OP1, and after the meter reading instruction sent by the concentrator is received by the meter end, a response and feedback signal passes through the RXD _ MBUS network, and the TTL level received by the fourth pin of U18 returns to the concentrator through the chip.
As shown in fig. 4, when the concentrator sends a meter reading instruction to the repeater through the uplink RS485 wired remote transmission communication module, (since 2-wire 485 is used, all the transmission and reception are shared by two wires and cannot be simultaneously transmitted and received), at this time, the fourth pin of U16 of the downlink RS485 to TTL communication module receives a meter reading signal from the uplink RS485 wired remote transmission communication module or the uplink wireless remote transmission communication module through ZB _ RXD, the meter reading signal is modulated into an RS485 signal through a signal of U16, the 6 th pin and the 7 th pin of the chip send a meter reading instruction to the meter reading end, the meter reading end receives a response of the meter reading instruction, the RS485 signal is converted into a TTL signal through the chip and is output by the first pin, and the level is converted into a standard TTL level signal ZB _ TXD through a triode N45 and is directly returned to the concentrator. Therefore, the stability of the repeater system is improved in the process of returning to meter reading.
In one embodiment, the first signal level conversion circuit OP1 is an optical coupler.
In one embodiment, the second signal level conversion circuit is a transistor N45.
As an implementation manner, as shown in fig. 5, the uplink wireless remote communication module mainly includes a Lora wireless remote communication module U2, when the concentrator sends a meter reading instruction to the meter end through the uplink wireless remote communication module, the uplink wireless remote communication module receives the meter reading instruction sent from the concentrator, the uplink wireless remote communication module converts the instruction of receiving the electromagnetic field signal into a TTL level, and sends the TTL level directly to the meter end through a first pin of U2, the meter end directly and automatically feeds back data of the meter end after responding, the returned TTL level data is received through a second pin of U2, and the wireless remote communication module converts the received TTL level into the electromagnetic field signal and sends the electromagnetic field signal to the concentrator.
As an implementation manner, as shown in fig. 6, when the concentrator sends a meter reading instruction to the meter end (photoelectric direct-reading meter) through the uplink RS485 wired remote communication module, after the TTL level modulated by the first RS485 chip U18 is passed, the meter end responds, and a signal returned from the meter end passes through the network M-Bus +, and then through the band-pass filter circuit formed by the RC, the U014 operational amplifier chip amplifies and compares the analog signal acquired from the meter end, and outputs a digital signal at the fourth pin of the chip, and the digital signal is converted into a standard TTL level by the triode Q040 and then is transmitted to the uplink RS485 wired remote communication module or the wireless remote communication module through the network RXD _ MBUS, and the meter data is returned to the concentrator, thereby completing the meter reading operation.
For the embodiment of the invention, an uplink RS485 wired remote transmission communication module, an uplink wireless remote transmission communication module, a downlink RS485 to TTL communication module and a downlink M-Bus to TTL signal communication module can be simultaneously arranged in the system, as shown in figure 2, and the same TTL Bus can be adopted for communication, and the signal transmission can be carried out by adopting the various meter reading modes when in use.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A TTL bus communication system for a headend, comprising:
the concentrator is used for sending a meter reading instruction and receiving and processing data sent by a meter end;
the uplink RS485 wired remote transmission communication module is connected with the concentrator and comprises a first RS485 chip, a first signal level conversion circuit and a first RS485 signal enabling control circuit, wherein the first RS485 chip is used for converting an RS485 signal sent by the concentrator into a TTL signal, receiving a feedback signal of a meter end and returning the TTL signal to the concentrator, the first signal level conversion circuit is used for converting the TTL signal output by the first RS485 chip into a standard TTL level signal, and the first RS485 enabling control circuit is used for enabling the first RS485 chip;
the downlink RS485 to TTL communication module comprises a second RS485 chip, a second signal level conversion circuit and a second RS485 signal enable control circuit, wherein the second RS485 chip is used for receiving a meter reading signal TTL level signal output by the uplink RS485 wired remote transmission communication module, adjusting the meter reading signal TTL level signal into an RS485 signal, outputting the RS485 signal to a meter end, receiving the RS485 signal uploaded by the meter end, converting the RS485 signal into a TTL signal and outputting the TTL signal, and the second signal level conversion circuit converts the TTL signal output by the second RS485 chip into a standard TTL level signal and returns the standard TTL level signal to the concentrator;
and the uplink RS485 wired remote transmission communication module and the downlink RS485 to TTL communication module are communicated through a TTL bus.
2. The TTL bus communication system as recited in claim 1, further comprising an uplink wireless remote communication module, configured to convert an instruction of the electromagnetic field signal sent by the concentrator into an instruction of a TTL level signal, send the TTL level signal to the meter, convert TTL level data fed back from the meter into electromagnetic field signal data, and send the electromagnetic field signal data to the concentrator.
3. The TTL bus communication system as recited in claim 1, further comprising:
the downlink M-Bus to TTL signal communication module comprises,
the system comprises an operational amplifier chip, a third signal level conversion circuit and a band-pass filter circuit, wherein a signal returned by a meter end passes through the band-pass filter circuit, then is amplified and compared by the operational amplifier chip and is output as a digital signal, and the third signal level conversion circuit is used for converting the digital signal into a standard TTL level signal and transmitting the standard TTL level signal to the uplink RS485 wired remote transmission communication module.
4. The TTL bus communication system of claim 1, wherein the uplink RS485 wired remote communication module and the downlink RS485 to TTL communication module perform signal transmission therebetween in a transparent transmission manner.
5. The TTL bus communication system of claim 1, wherein the first signal level shifting circuit is an optocoupler.
6. The TTL bus communication system of claim 1, wherein the second signal level shifting circuit is a triode.
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| CN201911069064.6A CN110782645A (en) | 2019-11-05 | 2019-11-05 | TTL bus communication system |
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| CN201911069064.6A CN110782645A (en) | 2019-11-05 | 2019-11-05 | TTL bus communication system |
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