CN216391065U - RS485 communication-based multi-path-to-one-path data routing device - Google Patents

Abstract

The utility model relates to a data routing device for switching multiple paths to one path based on RS485 communication, which comprises a master control IC, a 485 isolation input circuit, a plurality of 485 isolation output circuits and a power supply circuit, wherein the output end of the 485 isolation input circuit and the input end of the 485 isolation output circuit are connected with pins of the master control IC; carry out data forwarding through a master control IC to the 485 signal that the semaphore sent, 485 keep apart receiving circuit and turn into TTL level signal with the 485 signal, then receive and forward by master control IC, keep apart sending circuit by 485 again and turn into the 485 signal with TTL level signal to realized 485 multichannel through a master control function IC and a plurality of buffer circuit and changeed the function of the same way, and simple structure, the cost is lower.

Description

RS485 communication-based multi-path-to-one-path data routing device

Technical Field

The utility model relates to the field of communication circuits, in particular to a data routing device for switching multiple paths into one path based on RS485 communication.

Background

When the existing RS485 communication circuit is used for transmission, one sending device generally corresponds to one receiving device, and if one receiving device needs to correspond to a plurality of sending devices, a 485 router needs to be added, but the existing 485 router is complex in structure and high in cost.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a data routing apparatus for multiplexing and demultiplexing based on RS485 communication, which can solve the problems in the background art.

The RS485 communication-based multi-path-to-one-path data routing device comprises a master control IC, a 485 isolation input circuit, a plurality of 485 isolation output circuits and a power supply circuit, wherein the output end of the 485 isolation input circuit and the input end of the 485 isolation output circuit are connected with pins of the master control IC, the input end of the 485 isolation input circuit is connected with an external annunciator, and the output end of the 485 isolation output circuit is connected with external equipment; the power supply circuit is used for supplying power to the master control IC, the 485 isolation input circuit and the 485 isolation output circuit.

Furthermore, the power supply circuit comprises a programmable power supply and a direct current supply circuit, the direct current supply circuit comprises a plurality of cascaded three-terminal voltage regulators, and the direct current supply circuit is externally connected with a direct current power supply and outputs a target level.

Further, the model of the master control IC is STM32F103, the 485 isolation input circuit and the 485 isolation input circuit have the same structure, and each of the 485 isolation input circuit and the 485 isolation input circuit comprises a receiving part, a transmitting part, an enabling part and a 485 driving part;

the 485 driving part comprises a 485 driving chip and a protection circuit, the protection circuit is arranged at the receiving input end and the sending output end of the 485 driving chip, and the receiving input end and the sending output end of the 485 driving chip are connected with the signal machine or external equipment;

the receiving part comprises a first optical coupler, the input end of the first optical coupler is connected with the receiving output end of the 485 driving chip, and the output end of the first optical coupler is connected with the pin of the master control IC;

the transmitting part comprises a second optical coupler, the input end of the second optical coupler is connected with the pin of the master control IC, and the output end of the second optical coupler is connected with the transmitting input end of the 485 driving chip;

the enabling part comprises a third optical coupler, the input end of the third optical coupler is connected with the receiving enabling end and the sending enabling end of the 485 driving chip, and the output end of the third optical coupler is connected with the pin of the master control IC;

the first optical coupler, the second optical coupler and the third optical coupler are all powered with the programmable power supply and the direct current power supply circuit.

Further, the protection circuit comprises a current limiting diode and a transient suppression diode which are arranged on the receiving input end and the transmitting output end of the 485 driving chip.

The utility model has the beneficial effects that: according to the RS485 communication-based multi-path to one-path data routing device, the 485 signal sent by the annunciator is subjected to data forwarding through the master control IC, the 485 isolation receiving circuit converts the 485 signal into the TTL level signal, then the master control IC receives and forwards the TTL level signal, and the 485 isolation sending circuit converts the TTL level signal into the 485 signal, so that the 485 multi-path to one-path function is realized through the master control IC and the isolation circuits, the structure is simple, and the cost is lower.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for a person skilled in the art, other relevant drawings can be obtained from the drawings without inventive effort:

FIG. 1 is a block diagram of the system of the present invention;

FIG. 2 is a block circuit diagram of the present invention;

FIG. 3 is a circuit diagram of a master IC power supply circuit of the present invention;

FIG. 4 is a circuit diagram of a 485 isolation circuit of the present invention;

fig. 5 is a circuit diagram of a 485 isolation input circuit and a 485 isolation output circuit of the present invention.

Detailed Description

As shown in fig. 1-5: the RS485 communication-based multi-path-to-one-path data routing device comprises a master control IC, a 485 isolation input circuit, a plurality of 485 isolation output circuits and a power supply circuit, wherein the output end of the 485 isolation input circuit and the input end of the 485 isolation output circuit are connected with pins of the master control IC, the input end of the 485 isolation input circuit is connected with an external annunciator, and the output end of the 485 isolation output circuit is connected with external equipment; the power supply circuit is used for supplying power to the master control IC, the 485 isolation input circuit and the 485 isolation output circuit.

According to the RS485 communication-based multi-path to one-path data routing device, the 485 signal sent by the annunciator is subjected to data forwarding through the master control IC, the 485 isolation receiving circuit converts the 485 signal into the TTL level signal, then the master control IC receives and forwards the TTL level signal, and the 485 isolation sending circuit converts the TTL level signal into the 485 signal, so that the 485 multi-path to one-path function is realized through the master control IC and the isolation circuits, the structure is simple, and the cost is lower.

Specifically, the method comprises the following steps:

in this embodiment, the power supply circuit includes a programmable power supply and a direct current power supply circuit, and an input terminal VCC of the programmable power supply is converted into a direct current power supply CVCC of DC5V through the programmable power supply circuit;

the direct current power supply circuit comprises two cascaded three-terminal voltage regulators U1 and LM1, and the direct current power supply circuit enables a +12V external direct current power supply to output a target level + 3.3V.

In this embodiment, the main control IC adopts an STM32F103 single chip microcomputer, and the 485 isolation input circuit have the same structure and each include a receiving part, a transmitting part, an enabling part and a 485 driving part;

the 485 driving part comprises a 485 driving chip and a protection circuit, the protection circuit is arranged at a receiving input end and a sending output end of the 485 driving chip, the protection circuit comprises a current limiting diode and a transient suppression diode which are arranged at the receiving input end and the sending output end of the 485 driving chip, and the protection circuit is mainly used for filtering reverse signals and suppressing transient voltage signals so as to protect the 485 driving chip; a receiving input end A and a sending output end B of the 485 driving chip are connected with a signal machine or external equipment;

the receiving part comprises a first optical coupler, and the input end of the first optical coupler is connected with the receiving output end RXD3_485 of the 485 driving chip and is driven by the CVCC; the output end of the first optical coupler is connected with a pin (RXD3) of the main control IC and is connected to a VCC drive, and meanwhile, a pull-up resistor R34 is correspondingly arranged and is connected with a target level +3.3V, so that the corresponding pin keeps a high level state;

the transmitting part comprises a second optical coupler, wherein the input end of the second optical coupler is connected with a pin (TXD3) of the main control IC and is driven by a target level + 3.3V; the output end of the second optical coupler is connected with the sending input end RXD3_485 of the 485 driving chip and is driven by the CVCC;

the enabling part comprises a third optical coupler, and the input end of the third optical coupler is connected with a receiving enabling end RE and a sending enabling end DE of the 485 driving chip and is driven by a CVCC; the output terminal of the third optocoupler is connected to a pin of the main control IC (SWRT3) and is driven by the target level + 3.3V.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (4)

1. Data routing device that multichannel was gone all the way based on RS485 communication, its characterized in that: the 485 isolation input circuit comprises a master control IC, a 485 isolation input circuit, a plurality of 485 isolation output circuits and a power supply circuit, wherein the output end of the 485 isolation input circuit and the input end of the 485 isolation output circuit are both connected with pins of the master control IC, the input end of the 485 isolation input circuit is connected with an external annunciator, and the output end of the 485 isolation output circuit is connected with external equipment; the power supply circuit is used for supplying power to the master control IC, the 485 isolation input circuit and the 485 isolation output circuit.

2. The RS485 communication based data routing device capable of switching paths according to claim 1, wherein: the power supply circuit comprises a programmable power supply and a direct current power supply circuit, the direct current power supply circuit comprises a plurality of cascaded three-terminal voltage regulators, and the direct current power supply circuit is externally connected with the direct current power supply and outputs a target level.

3. The RS485 communication based multi-path to one-path data routing device according to claim 2, wherein: the master control IC is STM32F103 in model, the 485 isolation input circuit and the 485 isolation input circuit have the same structure and respectively comprise a receiving part, a sending part, an enabling part and a 485 driving part;

the 485 driving part comprises a 485 driving chip and a protection circuit, the protection circuit is arranged at the receiving input end and the sending output end of the 485 driving chip, and the receiving input end and the sending output end of the 485 driving chip are connected with the signal machine or external equipment;

the receiving part comprises a first optical coupler, the input end of the first optical coupler is connected with the receiving output end of the 485 driving chip, and the output end of the first optical coupler is connected with the pin of the master control IC;

the transmitting part comprises a second optical coupler, the input end of the second optical coupler is connected with the pin of the master control IC, and the output end of the second optical coupler is connected with the transmitting input end of the 485 driving chip;

the enabling part comprises a third optical coupler, the input end of the third optical coupler is connected with the receiving enabling end and the sending enabling end of the 485 driving chip, and the output end of the third optical coupler is connected with the pin of the master control IC;

the first optical coupler, the second optical coupler and the third optical coupler are all powered with the programmable power supply and the direct current power supply circuit.

4. The RS485 communication based data routing device capable of switching paths according to claim 3, wherein: the protection circuit comprises a current limiting diode and a transient suppression diode which are arranged on a receiving input end and a transmitting output end of the 485 driving chip.

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