CN211427331U - Multi-channel communication conversion unit - Google Patents
Multi-channel communication conversion unit Download PDFInfo
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- CN211427331U CN211427331U CN201922440739.5U CN201922440739U CN211427331U CN 211427331 U CN211427331 U CN 211427331U CN 201922440739 U CN201922440739 U CN 201922440739U CN 211427331 U CN211427331 U CN 211427331U
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Abstract
The embodiment of the utility model discloses a multi-channel communication conversion unit, which comprises a main conversion chip connected with a USB; the four-way communication serial port is arranged on the main conversion chip; the first conversion chip is used for the mutual conversion between the USB terminal and the TTL terminal; the second conversion chip is used for mutual conversion between the TTL terminal and the RS232 terminal; the third conversion chip is used for mutual conversion between the TTL terminal and the RS485 terminal; a change over switch connects main conversion chip, and one keeps apart the chip, the utility model discloses a design of four conversion chips makes USB, singlechip serial ports, RS232, RS485 all convertible between two liang, and conversion function is various, decides the conversion route through double knives three fender switch, and convenient and fast changes more accurately high-efficient to set up between each serial ports or the interface and keep apart the chip, realized the electrical isolation between the chip, thereby guarantee the normal work of every chip, small in size, portable and practical.
Description
Technical Field
The utility model relates to a communication equipment field especially relates to a multichannel communication conversion unit.
Background
With the development of technology, the voltage reduction of microprocessors is the current trend, and the development of uneven voltage reduction brings key problems that must be solved by system designers: how to make reliable transitions between signal levels. The correct signal levels ensure reliable operation of the system and they prevent sensitive ICs from being damaged by excessive high or low voltage conditions. The level conversion is divided into unidirectional conversion and bidirectional conversion, and also comprises single power supply and double power supply conversion, and the double power supply conversion adopts a double-track scheme to meet the requirements of various aspects of performance.
The communication converting unit may implement the conversion of the level. Most of the existing communication conversion units are not designed with electric isolation, and few devices for electric isolation can only contain within 3 types of level conversion, because the complexity of circuits can be increased by expanding functions of isolated products if needed, the original small-size debugging tool becomes extremely large and inconvenient to carry and use, so that the function is limited.
Disclosure of Invention
An object of the utility model is to provide a multichannel communication conversion unit solves above technical problem.
The utility model provides a technical problem can adopt following technical scheme to realize:
a multi-channel communication conversion unit comprises
The USB serial port conversion device comprises a main conversion chip for converting a USB into a serial port, wherein the main conversion chip is provided with at least three serial ports, and each serial port is connected with a double-pole three-gear switch; the three serial ports are respectively connected:
at least one first conversion chip for converting the USB to the RS232 terminal or the RS485 terminal,
and at least one second conversion chip for converting TTL terminal to RS232 terminal,
and at least one third conversion chip for converting the TTL terminal to the RS485 terminal;
a plurality of isolating switches, each isolating switch being respectively
Is connected between the double-pole three-gear switch and the TTL terminal,
is connected between the double-pole three-gear switch and the RS232 terminal,
and the double-pole three-gear switch is connected between the double-pole three-gear switch and the RS485 terminal.
Preferably, the device further comprises a redundant interface connected with the serial port.
Preferably, the RS232 terminal is a three-pin audio jack terminal, and the RS485 terminal is a two-pin audio jack terminal.
Preferably, the output ends of the first conversion chip, the second conversion chip and the third conversion chip are all connected with a USART terminal.
Preferably, the USART terminal is a three-pin audio jack terminal.
Preferably, a first moving end of the double-pole three-gear switch is connected with an input end of the TTL terminal, a second moving end of the double-pole three-gear switch is connected with an input end of the RS232 terminal, and the TTL terminal and the RS232 terminal are mutually switched.
Preferably, a first moving end of the double-pole three-gear switch is connected with an input end of the TTL terminal, a second moving end of the double-pole three-gear switch is connected with an input end of the RS485 terminal, and the TTL terminal and the RS485 terminal are switched with each other.
Preferably, the first movable end of the double-pole three-gear switch is connected with the input end of the RS232 terminal, the second movable end of the double-pole three-gear switch is connected with the input end of the RS485 terminal, and the RS232 terminal and the RS485 terminal are mutually converted.
Preferably, the power supply is connected with the third conversion chip, the power supply is connected with a low-voltage-drop voltage stabilizer, and the low-voltage-drop voltage stabilizer is respectively connected with the main conversion chip, the first conversion chip and the second conversion chip.
Preferably, a power input end of the isolation switch is connected with the low-voltage regulator, and an output end of each of the isolation switches is connected with the RS232 terminal and the RS485 terminal respectively.
Has the advantages that: the utility model discloses a design of four conversion chips makes USB, TTL terminal, RS232 terminal, RS485 terminal all convertible between two liang, and conversion function is various, through the switch decision conversion way that keeps off three double knives, convenient and fast, and the conversion is more accurate high-efficient to set up isolator between each serial ports or the interface, realized the electrical isolation between the chip, thereby guarantee the normal work of every chip, small in size, portable and practical.
Drawings
Fig. 1 is a circuit connection block diagram of a communication conversion unit according to the present invention;
fig. 2 is a power connection block diagram of the communication conversion unit of the present invention;
fig. 3 is a circuit diagram of an isolating switch of the communication switching unit of the present invention;
fig. 4 is a circuit diagram of an RS232 terminal of the communication conversion unit of the present invention;
fig. 5 is a circuit diagram of an RS485 terminal of the communication conversion unit of the present invention;
fig. 6 is a circuit diagram of a main conversion chip of the communication conversion unit of the present invention.
In the figure: 1-a main conversion chip; 2-a first conversion chip; 3-a second conversion chip; 4-a third conversion chip; 5-double-pole three-gear switch; 6-redundant interfaces; 7-a power supply; 8-low dropout voltage regulator; 9-isolating switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
As shown in FIG. 1, the utility model provides a multichannel communication conversion unit, include
The USB serial port conversion device comprises a main conversion chip 1 for converting a USB into a serial port, wherein the main conversion chip provides at least three serial ports, namely a double-pole three-level switch 5 is connected with all the serial ports, and all the serial ports are connected with the double-pole three-level switch 5;
the three serial ports are respectively connected:
at least one first conversion chip 2 for converting USB to RS232 terminal or RS485 terminal,
and at least one second conversion chip 3 for converting TTL terminal to RS232 terminal,
and at least one third conversion chip 4 for converting TTL terminal to RS 485;
a plurality of isolating switches 9, each isolating switch 9 being respectively
Is connected between the double-pole three-gear switch 5 and the TTL terminal,
is connected between the double-pole three-gear switch 5 and the RS232 terminal,
and the double-pole three-gear switch is connected between the double-pole three-gear switch 5 and the RS485 terminal.
The utility model has the advantages that:
the utility model discloses a design of four conversion chips makes USB, TTL terminal, RS232 terminal, RS485 terminal all convertible between two liang, and conversion function is various, through the switch decision conversion way that keeps off three double knives, convenient and fast, and the conversion is more accurate high-efficient to set up isolator between each serial ports or the interface, realized the electrical isolation between the chip, thereby guarantee the normal work of every chip, small in size, portable and practical.
Additionally, the main conversion chip 2 can be a PL2303 chip; the second conversion chip 3 can select an MAX232 chip, and the third conversion chip 4 can select an MAX485 chip; the first conversion chip 2 can adopt an FT4232H chip, and an FT4232H chip can be used for the interconversion between USB and RS232 and between USB and RS 485.
The isolating switch 9 adopts a Linglitt ADuM1402 chip and adopts magnetic isolation, the traditional optical coupler has light attenuation and low speed, and the electromagnetic interference radiated by the magnetic isolating switch is absorbed by an equivalent cross capacitor formed by a power supply of a PCB and a stratum, so that the anti-interference performance of the product is stronger. The cooperation of the power supply and the isolating switch can ensure that any communication conversion can realize electrical isolation.
As a preferred embodiment of the present invention, the present invention further comprises a redundant interface 6 connected to a serial port. And the redundant design is convenient for the subsequent design of the communication board.
As a preferred embodiment of the present invention, the RS232 terminal is a three-pin audio jack terminal. The RS485 terminal is a two-pin audio frequency plug terminal.
The output ends of the first conversion chip, the second conversion chip and the third conversion chip are all connected with a USART terminal. The USART terminal is a three-pin audio frequency plug-in terminal.
Preferably, the various terminals are matched with portable plug-in connectors and audio interface connectors to replace the traditional screw locking line mode, so that the debugging efficiency is improved.
The input ends of the TTL terminal, the RS232 terminal and the RS485 terminal are all provided with switch contacts which are respectively 5a, 5b, 5c, 5d, 5e and 5f, and the switch contacts can be connected with two moving ends of the double-pole three-gear switch. The fixed end of the double-pole three-gear switch 5 is connected with the first conversion chip, the second conversion chip and the third conversion chip through serial ports.
As shown in fig. 2, as a preferred embodiment of the present invention, the first movable end of the double-pole three-gear switch is connected to the input end of the TTL terminal, the second movable end of the double-pole three-gear switch is connected to the input end of the RS232 terminal, and the TTL terminal and the RS232 terminal are switched. Namely, when the two moving ends of the double-pole three-gear switch are respectively connected with the two switch contacts 5d and 5e, the second conversion chip 3 completes the mutual conversion between TTL and RS 232.
The first movable end of the double-pole three-gear switch is connected with the input end of the TTL terminal, the second movable end of the double-pole three-gear switch is connected with the input end of the RS485 terminal, and the TTL terminal and the RS485 terminal are mutually converted. Namely, when the two moving ends of the double-pole three-gear switch are respectively connected with the two switch contacts 5d and 5f, the third conversion chip 4 completes the mutual conversion between TTL and RS 485.
The first end that moves of double-pole three-gear switch 5 is connected the input of RS232 terminal, and the second end that moves of double-pole three-gear switch is connected the input of RS485 terminal, and RS232 terminal and RS485 terminal interconversion. When two moving ends of the double-pole three-gear switch are respectively connected with the two switch contacts 5e and 5f, the RS232 is converted into the USB through the first chip 2, and then the USB is converted into the RS485 through the first chip 2; or the RS485 is converted into the USB through the first chip 2, and then the USB is converted into the RS232 through the first chip, so that the mutual conversion of the RS232 and the RS485 is completed.
When the two moving ends of the double-pole three-gear switch 5 are both connected with the switch contact 5d, the USB is converted into TTL by the main conversion chip and output.
When the two moving ends of the double-pole three-gear switch 5 are both connected with the switch contact 5e, or one moving end is connected with the switch contact 5e and the other moving end is connected with the switch contact 5a, the USB is converted into RS232 by the first conversion chip and is output.
When two moving ends of the double-pole three-gear switch 5 are connected with the switch contact 5f, or one moving end is connected with the switch 5e and the other moving end is connected with the switch 5a, the USB is converted into RS485 by the first conversion chip and is output.
Preferably, the mutual conversion between the USB and the RS232 terminal or the RS485 terminal, between the TT terminal and the RS232 terminal, between the TT terminal and the RS485 terminal and between the RS232 terminal and the RS485 terminal is realized through a double-pole three-gear switch, the structure is simple, the structure is small and exquisite, and the design of the communication board can be smaller and more exquisite.
It can be added that the input end of the RS232 terminal is connected to a MAX13234E chip, so that the signal reception of the RS232 is more complete and the signal reception efficiency is higher.
It can be added that the input end of the RS485 terminal is connected to a MAX13487E chip, the MAX13487E chip is a RS485 compatible transceiver with +5V power supply, half-duplex, and ± 15kVESD (Electro-static discharge) protection, and includes a driver and a receiver. The hot plug function is provided, and fault transient signals on the bus can be eliminated when the power is on or the hot plug is carried out. The automatic reversing switch has a special automatic direction selection control function, and can realize automatic reversing, so that the forward rotation of the level or the reverse rotation of the level is higher in switching efficiency.
The 485, 232 and USB connector model selection all adopt high-speed communication chips, so that the conventional 115200 communication baud rate of a client can be met, the 10M code element communication rate can be supported at the highest, and the application in a high-speed communication scene is met.
As shown in fig. 2, as a preferred embodiment of the present invention, the power supply device further includes a power supply 7, the power supply is an adapter or a USB power supply, the power supply output is +5V dc, the power supply 7 is connected to the third conversion chip 4, the power supply voltage of the third conversion chip 4 is 5V, the power supply 7 is connected to the low dropout regulator 8, which has the voltage reduction function, and the voltage reduction is performed to 3.3V and then is supplied to the main conversion chip 1, the first conversion chip 2 and the second conversion chip 3. The low dropout voltage regulator 8 is respectively connected with the main conversion chip 1, the first conversion chip 2 and the second conversion chip 3.
Different stable voltages can be improved according to different power supply requirements of each chip, and the safe and stable working environment of the chip is ensured.
One power input end of each isolating switch is connected with the low-voltage stabilizer 8, and one output end of each isolating switch 9 is connected with the RS232 terminal and the RS485 terminal respectively.
As shown in fig. 3 to 6, the isolation switch is connected with the RS232 terminal through pins 232-RX2 and 232TX2, and is connected with the RS485 terminal through pins GL485-DI2 and GL485-RO2, so that the isolation between the RS232 terminal and the RS485 terminal is realized. The input voltage of the isolating switch connected with the RS232 terminal is 3.3V, and the voltage input end of the isolating switch connected with the RS485 terminal is 5V.
The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.
Claims (10)
1. A multi-channel communication conversion unit, comprising
The USB serial port conversion device comprises a main conversion chip for converting a USB into a serial port, wherein the main conversion chip is provided with at least three serial ports, and each serial port is connected with a double-pole three-gear switch; the three serial ports are respectively connected:
at least one first conversion chip for converting the USB to the RS232 terminal or the RS485 terminal,
and at least one second conversion chip for converting TTL terminal to RS232 terminal,
and at least one third conversion chip for converting the TTL terminal to the RS485 terminal;
a plurality of isolating switches, each isolating switch being respectively
Is connected between the double-pole three-gear switch and the TTL terminal,
is connected between the double-pole three-gear switch and the RS232 terminal,
and the double-pole three-gear switch is connected between the double-pole three-gear switch and the RS485 terminal.
2. The multi-channel communication conversion unit of claim 1, further comprising a redundant interface connected to a serial port.
3. The multi-channel communication conversion unit of claim 1, wherein the RS232 terminal is a three-pin audio jack terminal, and the RS485 terminal is a two-pin audio jack terminal.
4. The multi-channel communication conversion unit of claim 1, wherein the output ends of the first conversion chip, the second conversion chip and the third conversion chip are all connected with a USART terminal.
5. The multi-channel communication conversion unit of claim 4, wherein the USART terminal is a three-pin audio jack terminal.
6. The multi-channel communication conversion unit according to claim 1, wherein a first moving terminal of the double-pole three-stage switch is connected to the input terminal of the TTL terminal, a second moving terminal of the double-pole three-stage switch is connected to the input terminal of the RS232 terminal, and the TTL terminal and the RS232 terminal are mutually converted.
7. The multi-channel communication conversion unit of claim 1, wherein a first moving end of the double-pole three-position switch is connected to the input end of the TTL terminal, a second moving end of the double-pole three-position switch is connected to the input end of the RS485 terminal, and the TTL terminal and the RS485 terminal are converted with each other.
8. The multi-channel communication conversion unit according to claim 1, wherein a first moving end of the double-pole three-position switch is connected to the input end of the RS232 terminal, a second moving end of the double-pole three-position switch is connected to the input end of the RS485 terminal, and the RS232 terminal and the RS485 terminal are mutually converted.
9. The multi-channel communication conversion unit of claim 1, further comprising a power supply, wherein the power supply is connected to the third conversion chip, the power supply is connected to a low dropout regulator, and the low dropout regulator is respectively connected to the main conversion chip, the first conversion chip, and the second conversion chip.
10. The multi-channel communication conversion unit of claim 9, wherein a power input terminal of the isolation switch is connected to a low voltage regulator, and an output terminal of the isolation switches is connected to the RS232 terminal and the RS485 terminal, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922440739.5U CN211427331U (en) | 2019-12-30 | 2019-12-30 | Multi-channel communication conversion unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922440739.5U CN211427331U (en) | 2019-12-30 | 2019-12-30 | Multi-channel communication conversion unit |
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| Publication Number | Publication Date |
|---|---|
| CN211427331U true CN211427331U (en) | 2020-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922440739.5U Active CN211427331U (en) | 2019-12-30 | 2019-12-30 | Multi-channel communication conversion unit |
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| CN (1) | CN211427331U (en) |
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