CN204440391U - A kind of full isolated form RS485 bus transceiver - Google Patents
A kind of full isolated form RS485 bus transceiver Download PDFInfo
- Publication number
- CN204440391U CN204440391U CN201520080274.6U CN201520080274U CN204440391U CN 204440391 U CN204440391 U CN 204440391U CN 201520080274 U CN201520080274 U CN 201520080274U CN 204440391 U CN204440391 U CN 204440391U
- Authority
- CN
- China
- Prior art keywords
- pin
- chip
- resistance
- photoelectric isolated
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Power Sources (AREA)
Abstract
A kind of full isolated form RS485 bus transceiver, comprise a main frame, a RS485 telecommunication cable and a feed cable, a side of host housing is provided with RS485 communications connector; Another side of main frame is provided with supply socket, and supply socket is connected with feed cable; One piece of circuit board is equipped with in host housing inside, and the circuit of this circuit board is made up of Microprocessor Interface circuit, transmission photoelectric isolating circuit, reception photoelectric isolating circuit, data direction commutation circuit, RS232 level shifting circuit, DC-DC insulating power supply circuit.The utility model can well realize the internodal electrical isolation of each RS485 in bus, cuts off and transmits generation common mode interference altogether, strengthens the antijamming capability of bus node, thus meets the reliability requirement of the long haul communication under Industry Control occasion.
Description
Art
The utility model relates to serial communication technology field, is specifically related to isolated form RS485 bus transceiver.
Background technology
Along with the development of the present computer technology, serial communication technology obtains great development.RS485 serial communication is a kind of standard comparatively early occurred, being widely used in the connection between computing machine and various peripherals, is the standard interface of data terminal equipment.In the past, PC and smart machine communication over-borrowing help RS232 serial mode, if number of devices is more than 2, just must use RS485 serial communication, RS485 is for very convenient during multi-point interconnection, can save many signal wires, application RS485 can network formation distributed system, and it allows 32 drivers in parallel at most and 32 receivers.RS-485 adopts half-duplex operation, and any whenever can only be had to be in transmission state, and therefore, transtation mission circuit must be controlled by enable signal.Require communication distance be tens meters on km time, also extensively RS485 serial communication is adopted, RS485 adopts balance to send and differential received, therefore there is the ability of certain suppression common mode interference, but RS485 interface uses a signal wire and a signal line of return and forms the transmission form on common ground, and this transmission altogether easily produces common mode interference, especially in industry spot, RS485 often communicates because of interference and makes mistakes, and even cannot work.
Utility model content
The purpose of this utility model is to provide a kind of full isolated form RS485 bus transceiver, this transceiver can well realize the internodal electrical isolation of each RS485 in bus, cut off and transmit generation common mode interference altogether, strengthen the antijamming capability of bus node, thus meet the reliability requirement of the long haul communication under Industry Control occasion.
In order to achieve the above object, the technical solution of the utility model is as follows:
Described one full isolated form RS485 bus transceiver, comprises a main frame, a RS485 telecommunication cable and a feed cable.Main frame has a rectangular flat shell, and a side of host housing is provided with RS485 communications connector, and RS485 communications connector is connected with RS485 telecommunication cable; Another side of main frame is provided with supply socket, and supply socket is connected with feed cable; One piece of circuit board is equipped with in host housing inside, the circuit of this circuit board is made up of Microprocessor Interface circuit, transmission photoelectric isolating circuit, reception photoelectric isolating circuit, data direction commutation circuit, RS232 level shifting circuit, DC-DC insulating power supply circuit, J1 on circuit board is connected with the RS485 communications connector of host housing, VCC and GND on circuit board is connected with the supply socket of host housing.
On described circuit board, Microprocessor Interface circuit is by singlechip chip U1, and electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, crystal oscillator Y1 form; The pin 9 of singlechip chip U1 is connected with ground wire GND through resistance R1; The pin 9 of singlechip chip U1 is connected with power lead VCC through electric capacity C3; Crystal oscillator Y1 is connected across between the pin one 8 of singlechip chip U1, pin one 9; The pin one 8 of singlechip chip U1 is connected with ground wire GND through electric capacity C1; The pin one 9 of singlechip chip U1 is connected with ground wire GND through electric capacity C2.
Described circuit board sends photoelectric isolating circuit to be made up of photoelectric isolated chip U3, resistance R3, resistance R6; The pin two of photoelectric isolated chip U3 is connected with power lead VCC; The pin 3 of photoelectric isolated chip U3 is connected with the pin one 1 of singlechip chip U1 through resistance R3; Pin 7, the pin 8 of photoelectric isolated chip U3 are connected with power lead+V0 after being connected; The pin 5 of photoelectric isolated chip U3 is connected with isolated ground GNDA; The pin 6 of photoelectric isolated chip U3 is connected with power lead+V0 through resistance R6.
Described circuit board receives photoelectric isolating circuit to be made up of photoelectric isolated chip U2, resistance R2, resistance R5; The pin two of photoelectric isolated chip U2 is connected with power lead+V0; The pin 3 of photoelectric isolated chip U2 is connected with the pin one of RS485 level transferring chip U5 through resistance R5; Pin 7, the pin 8 of photoelectric isolated chip U2 are connected with power lead VCC after being connected; The pin 5 of photoelectric isolated chip U2 is connected with ground wire GND; The pin 6 of photoelectric isolated chip U2 is connected with power lead VCC through resistance R2; The pin 6 of photoelectric isolated chip U2 is connected with the pin one 0 of singlechip chip U1.
On described circuit board, data direction commutation circuit is made up of photoelectric isolated chip U4, resistance R7; The pin two of photoelectric isolated chip U4 is connected with power lead VCC; The pin 3 of photoelectric isolated chip U4 is connected with the pin two 1 of singlechip chip U1 through resistance R7; Pin 7, the pin 8 of photoelectric isolated chip U4 are connected with power lead+V0 after being connected; The pin 5 of photoelectric isolated chip U4 is connected with isolated ground GNDA; The pin 6 of photoelectric isolated chip U4 is connected with power lead+V0 through resistance R8; Pin two, the pin 3 of the pin 6 of photoelectric isolated chip U4 and the common point extension line of resistance R8 and RS485 level transferring chip U5 are connected.
On described circuit board, RS485 level shifting circuit is made up of RS485 level transferring chip U5, connector J1; The pin 8 of RS485 level transferring chip U5 is connected with power lead+V0; The pin one of RS485 level transferring chip U5 is connected with the pin 3 of photoelectric isolated chip U2 through resistance R5; Pin two, the pin 3 of RS485 level transferring chip U5 are connected with the pin 6 of photoelectric isolated chip U4 after being connected; The pin 4 of RS485 level transferring chip U5 is connected with the pin 6 of photoelectric isolated chip U3; The pin one of connector J1 is connected with the pin 6 of RS485 level transferring chip U5; The pin two of connector J1 is connected with the pin 7 of RS485 level transferring chip U5.
On described circuit board, DC-DC insulating power supply circuit is made up of insulating power supply M1, electric capacity C4, electric capacity C5, resistance R4, the pin one of insulating power supply M1 is connected with power supply VCC, the pin two of insulating power supply M1 is connected with GND, electric capacity C4 is connected across between the pin one of insulating power supply M1, pin two, the pin 3 of insulating power supply M1 is connected with power supply+V0, the pin 4 of insulating power supply M1 is connected with GNDA isolator, after electric capacity C5 is in parallel with resistance R4, is connected across between the pin 3 of insulating power supply M1, pin 4.
The model of described RS485 level transferring chip U5 is MAX485, and the model of photoelectric isolated chip U2 is 6M137, and the model of photoelectric isolated chip U3 is 6M137, and the model of photoelectric isolated chip U4 is 6M137.
The pin one of RS485 level transferring chip MAX485 described in the utility model with pin 4 by being connected with pin RXD with the pin TXD of single-chip microcomputer after high speed optoelectronic isolating chip 6M137, well achieve the internodal electrical isolation of constrained input in bus, the power supply of VCC and+V0 is completely isolated by DC-DC isolation module, effectively inhibit electromagnetic interference (EMI) and the ground loop interference of peripheral circuits, thus protection system circuit affects from external network, greatly strengthen the antijamming capability of RS485 bus node, make communication reliable and stable, thus meet the reliability requirement of the long haul communication under Industry Control occasion.
Accompanying drawing explanation
Fig. 1 is main machine structure schematic diagram of the present utility model.
Fig. 2 is theory diagram of the present utility model.
Fig. 3 is circuit theory diagrams of the present utility model.
Part numbers in accompanying drawing 1 is: 1 is main frame, and 2 is supply socket, and 3 is feed cable, and 4 is RS485 communications connector, and 5 is RS485 telecommunication cable.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail.
Embodiment
See Fig. 1, Fig. 2, Fig. 3, a kind of full isolated form RS485 bus transceiver, comprises a main frame 1, RS485 telecommunication cable 5 and a feed cable 3.Main frame 1 has a rectangular flat shell, and a side of main frame 1 shell is provided with RS485 communications connector 4, RS485 communications connector 4 and is connected with RS485 telecommunication cable 5; Another side of main frame 1 is provided with supply socket 2, and supply socket 2 is connected with feed cable 3; Main frame 1 enclosure is equipped with one piece of circuit board, the circuit of this circuit board is made up of Microprocessor Interface circuit, transmission photoelectric isolating circuit, reception photoelectric isolating circuit, data direction commutation circuit, RS232 level shifting circuit, DC-DC insulating power supply circuit, J1 on circuit board is connected with the RS485 communications connector 4 of main frame 1 shell, VCC and GND on circuit board is connected with the supply socket 2 of main frame 1 shell.
On described circuit board, Microprocessor Interface circuit is by singlechip chip U1, and electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, crystal oscillator Y1 form; The pin 9 of singlechip chip U1 is connected with ground wire GND through resistance R1; The pin 9 of singlechip chip U1 is connected with power lead VCC through electric capacity C3; Crystal oscillator Y1 is connected across between the pin one 8 of singlechip chip U1, pin one 9; The pin one 8 of singlechip chip U1 is connected with ground wire GND through electric capacity C1; The pin one 9 of singlechip chip U1 is connected with ground wire GND through electric capacity C2.
Described circuit board sends photoelectric isolating circuit to be made up of photoelectric isolated chip U3, resistance R3, resistance R6; The pin two of photoelectric isolated chip U3 is connected with power lead VCC; The pin 3 of photoelectric isolated chip U3 is connected with the pin one 1 of singlechip chip U1 through resistance R3; Pin 7, the pin 8 of photoelectric isolated chip U3 are connected with power lead+V0 after being connected; The pin 5 of photoelectric isolated chip U3 is connected with isolated ground GNDA; The pin 6 of photoelectric isolated chip U3 is connected with power lead+V0 through resistance R6.
Described circuit board receives photoelectric isolating circuit to be made up of photoelectric isolated chip U2, resistance R2, resistance R5; The pin two of photoelectric isolated chip U2 is connected with power lead+V0; The pin 3 of photoelectric isolated chip U2 is connected with the pin one of RS485 level transferring chip U5 through resistance R5; Pin 7, the pin 8 of photoelectric isolated chip U2 are connected with power lead VCC after being connected; The pin 5 of photoelectric isolated chip U2 is connected with ground wire GND; The pin 6 of photoelectric isolated chip U2 is connected with power lead VCC through resistance R2; The pin 6 of photoelectric isolated chip U2 is connected with the pin one 0 of singlechip chip U1.
On described circuit board, data direction commutation circuit is made up of photoelectric isolated chip U4, resistance R7; The pin two of photoelectric isolated chip U4 is connected with power lead VCC; The pin 3 of photoelectric isolated chip U4 is connected with the pin two 1 of singlechip chip U1 through resistance R7; Pin 7, the pin 8 of photoelectric isolated chip U4 are connected with power lead+V0 after being connected; The pin 5 of photoelectric isolated chip U4 is connected with isolated ground GNDA; The pin 6 of photoelectric isolated chip U4 is connected with power lead+V0 through resistance R8; Pin two, the pin 3 of the pin 6 of photoelectric isolated chip U4 and the common point extension line of resistance R8 and RS485 level transferring chip U5 are connected.
On described circuit board, RS485 level shifting circuit is made up of RS485 level transferring chip U5, connector J1; The pin 8 of RS485 level transferring chip U5 is connected with power lead+V0; The pin one of RS485 level transferring chip U5 is connected with the pin 3 of photoelectric isolated chip U2 through resistance R5; Pin two, the pin 3 of RS485 level transferring chip U5 are connected with the pin 6 of photoelectric isolated chip U4 after being connected; The pin 4 of RS485 level transferring chip U5 is connected with the pin 6 of photoelectric isolated chip U3; The pin one of connector J1 is connected with the pin 6 of RS485 level transferring chip U5; The pin two of connector J1 is connected with the pin 7 of RS485 level transferring chip U5.
On described circuit board, DC-DC insulating power supply circuit is made up of insulating power supply M1, electric capacity C4, electric capacity C5, resistance R4, the pin one of insulating power supply M1 is connected with power supply VCC, the pin two of insulating power supply M1 is connected with GND, electric capacity C4 is connected across between the pin one of insulating power supply M1, pin two, the pin 3 of insulating power supply M1 is connected with power supply+V0, the pin 4 of insulating power supply M1 is connected with GNDA isolator, after electric capacity C5 is in parallel with resistance R4, is connected across between the pin 3 of insulating power supply M1, pin 4.
The model of described RS485 level transferring chip U5 is MAX485, and the model of photoelectric isolated chip U2 is 6M137, and the model of photoelectric isolated chip U3 is 6M137, and the model of photoelectric isolated chip U4 is 6M137.
Claims (2)
1. a full isolated form RS485 bus transceiver, comprise a main frame, a RS485 telecommunication cable and a feed cable, it is characterized in that: main frame has a rectangular flat shell, a side of host housing is provided with RS485 communications connector, and RS485 communications connector is connected with RS485 telecommunication cable; Another side of main frame is provided with supply socket, and supply socket is connected with feed cable; One piece of circuit board is equipped with in host housing inside, the circuit of this circuit board is made up of Microprocessor Interface circuit, transmission photoelectric isolating circuit, reception photoelectric isolating circuit, data direction commutation circuit, RS232 level shifting circuit, DC-DC insulating power supply circuit, J1 on circuit board is connected with the RS485 communications connector of host housing, VCC and GND on circuit board is connected with the supply socket of host housing.
2. one according to claim 1 full isolated form RS485 bus transceiver, is characterized in that: on described circuit board, Microprocessor Interface circuit is by singlechip chip U1, electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, crystal oscillator Y1 form; The pin 9 of singlechip chip U1 is connected with ground wire GND through resistance R1; The pin 9 of singlechip chip U1 is connected with power lead VCC through electric capacity C3; Crystal oscillator Y1 is connected across between the pin one 8 of singlechip chip U1, pin one 9; The pin one 8 of singlechip chip U1 is connected with ground wire GND through electric capacity C1; The pin one 9 of singlechip chip U1 is connected with ground wire GND through electric capacity C2; Described circuit board sends photoelectric isolating circuit to be made up of photoelectric isolated chip U3, resistance R3, resistance R6; The pin two of photoelectric isolated chip U3 is connected with power lead VCC; The pin 3 of photoelectric isolated chip U3 is connected with the pin one 1 of singlechip chip U1 through resistance R3; Pin 7, the pin 8 of photoelectric isolated chip U3 are connected with power lead+V0 after being connected; The pin 5 of photoelectric isolated chip U3 is connected with isolated ground GNDA; The pin 6 of photoelectric isolated chip U3 is connected with power lead+V0 through resistance R6; Described circuit board receives photoelectric isolating circuit to be made up of photoelectric isolated chip U2, resistance R2, resistance R5; The pin two of photoelectric isolated chip U2 is connected with power lead+V0; The pin 3 of photoelectric isolated chip U2 is connected with the pin one of RS485 level transferring chip U5 through resistance R5; Pin 7, the pin 8 of photoelectric isolated chip U2 are connected with power lead VCC after being connected; The pin 5 of photoelectric isolated chip U2 is connected with ground wire GND; The pin 6 of photoelectric isolated chip U2 is connected with power lead VCC through resistance R2; The pin 6 of photoelectric isolated chip U2 is connected with the pin one 0 of singlechip chip U1; On described circuit board, data direction commutation circuit is made up of photoelectric isolated chip U4, resistance R7; The pin two of photoelectric isolated chip U4 is connected with power lead VCC; The pin 3 of photoelectric isolated chip U4 is connected with the pin two 1 of singlechip chip U1 through resistance R7; Pin 7, the pin 8 of photoelectric isolated chip U4 are connected with power lead+V0 after being connected; The pin 5 of photoelectric isolated chip U4 is connected with isolated ground GNDA; The pin 6 of photoelectric isolated chip U4 is connected with power lead+V0 through resistance R8; Pin two, the pin 3 of the pin 6 of photoelectric isolated chip U4 and the common point extension line of resistance R8 and RS485 level transferring chip U5 are connected; On described circuit board, RS485 level shifting circuit is made up of RS485 level transferring chip U5, connector J1; The pin 8 of RS485 level transferring chip U5 is connected with power lead+V0; The pin one of RS485 level transferring chip U5 is connected with the pin 3 of photoelectric isolated chip U2 through resistance R5; Pin two, the pin 3 of RS485 level transferring chip U5 are connected with the pin 6 of photoelectric isolated chip U4 after being connected; The pin 4 of RS485 level transferring chip U5 is connected with the pin 6 of photoelectric isolated chip U3; The pin one of connector J1 is connected with the pin 6 of RS485 level transferring chip U5; The pin two of connector J1 is connected with the pin 7 of RS485 level transferring chip U5; On described circuit board, DC-DC insulating power supply circuit is made up of insulating power supply M1, electric capacity C4, electric capacity C5, resistance R4, the pin one of insulating power supply M1 is connected with power supply VCC, the pin two of insulating power supply M1 is connected with GND, electric capacity C4 is connected across between the pin one of insulating power supply M1, pin two, the pin 3 of insulating power supply M1 is connected with power supply+V0, the pin 4 of insulating power supply M1 is connected with GNDA isolator, after electric capacity C5 is in parallel with resistance R4, is connected across between the pin 3 of insulating power supply M1, pin 4; The model of described RS485 level transferring chip U5 is MAX485, and the model of photoelectric isolated chip U2 is 6M137, and the model of photoelectric isolated chip U3 is 6M137, and the model of photoelectric isolated chip U4 is 6M137.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520080274.6U CN204440391U (en) | 2015-02-04 | 2015-02-04 | A kind of full isolated form RS485 bus transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520080274.6U CN204440391U (en) | 2015-02-04 | 2015-02-04 | A kind of full isolated form RS485 bus transceiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204440391U true CN204440391U (en) | 2015-07-01 |
Family
ID=53608230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520080274.6U Expired - Fee Related CN204440391U (en) | 2015-02-04 | 2015-02-04 | A kind of full isolated form RS485 bus transceiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204440391U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194094A (en) * | 2018-09-20 | 2019-01-11 | 山东奥卓电气科技发展有限公司 | A kind of high reliability frequency converter RS485 communication board and its control method |
| CN110534824A (en) * | 2019-07-22 | 2019-12-03 | 大城绿川（深圳）科技有限公司 | A kind of lead-acid accumulator on-line intelligence maintenance system of the RS485 communication based on adaptive networking |
-
2015
- 2015-02-04 CN CN201520080274.6U patent/CN204440391U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194094A (en) * | 2018-09-20 | 2019-01-11 | 山东奥卓电气科技发展有限公司 | A kind of high reliability frequency converter RS485 communication board and its control method |
| CN110534824A (en) * | 2019-07-22 | 2019-12-03 | 大城绿川（深圳）科技有限公司 | A kind of lead-acid accumulator on-line intelligence maintenance system of the RS485 communication based on adaptive networking |
| CN110534824B (en) * | 2019-07-22 | 2022-10-21 | 大城绿川（深圳）科技有限公司 | RS485 communication lead-acid storage battery online intelligent maintenance system based on self-adaptive networking |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202872757U (en) | RS485 photoelectric communication conversion device | |
| CN203933593U (en) | Half-duplex RS-485 isolation communicating circuit | |
| CN105515927A (en) | Remote serial port communication system and method based on Ethernet Cat.5 wiring framework | |
| CN204440391U (en) | A kind of full isolated form RS485 bus transceiver | |
| CN201515385U (en) | Multi-interface Ethernet switch | |
| CN203520091U (en) | Can communication interface circuit | |
| CN103065117B (en) | A kind of bluetooth scanner | |
| CN214707733U (en) | Communication circuit of monitoring equipment | |
| CN206363306U (en) | A kind of terminal and its serial communication circuit | |
| CN204759408U (en) | Full isolated form RS232 bus transceiver | |
| CN103746717A (en) | CFP connector and CFP transmission architecture | |
| CN203482204U (en) | USB-optical fiber Ethernet converter | |
| CN204304165U (en) | Usb adapter | |
| CN203490496U (en) | CAN bus controller based on SIP packaging technology | |
| CN202206391U (en) | Wired expansion apparatus for wireless communication network | |
| CN203193608U (en) | High isolation direct splice half-duplex communication interface module for interconnection of multiple controllers | |
| CN201829936U (en) | Centralized control system of mine explosion-proof and intrinsic safety type combined switch | |
| CN202120109U (en) | CAN (Controller Area Network) bus control device of radiotherapy equipment | |
| CN201376128Y (en) | Linear cutting program transmitter | |
| CN201853229U (en) | Module converting industrial-grade USB to RS232 | |
| CN202815825U (en) | Burn and communication circuit for personal computer (PC) and frequency converter | |
| CN221263821U (en) | RS485 communication circuit with optical coupling isolation and communication system | |
| CN103390931A (en) | Power distribution system and device with cloud terminal function | |
| CN104683116B (en) | A kind of mining RS 485 isolates repeater | |
| CN211018834U (en) | Photoelectric isolation bidirectional repeater circuit and waterproof repeater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20160204 |