CN209072482U - Novel slave mode RS485 telecommunication circuit and its measuring instrument - Google Patents
Novel slave mode RS485 telecommunication circuit and its measuring instrument Download PDFInfo
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- CN209072482U CN209072482U CN201920027214.6U CN201920027214U CN209072482U CN 209072482 U CN209072482 U CN 209072482U CN 201920027214 U CN201920027214 U CN 201920027214U CN 209072482 U CN209072482 U CN 209072482U
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- isolation optocoupler
- serial ports
- optocoupler
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- receiving
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Abstract
The utility model discloses a kind of novel slave mode RS485 telecommunication circuits, module, the quick receiving module of serial ports and the quick sending module of serial ports are enabled including RS485 communication chip, chip, the RS485 bus end of RS485 communication chip exports RS485 signal of communication, the serial ports receiving end of RS485 communication chip connects the receiving end of rs 232 serial interface signal by the quick receiving module of serial ports of concatenation, serial ports transmitting terminal connects the transmitting terminal of rs 232 serial interface signal by the quick sending module of serial ports of concatenation, and enable end enables module by the chip of concatenation and connects enable signal.The invention also discloses the measuring instruments including the novel slave mode RS485 telecommunication circuit.The utility model passes through the design of the quick sending module of serial ports and the quick receiving module of serial ports, can reach higher RS485 traffic rate using common optical coupler, and circuit cost is cheap, high reliablity.
Description
Technical field
The utility model is specifically related to a kind of novel slave mode RS485 telecommunication circuit and its measuring instrument.
Background technique
With the development of economic technology, electronic equipment is had been widely used in people's production and life, to people's
Production and life bring endless convenience.RS485 telecommunication circuit is the telecommunication circuit of better performances, and communication speed is stablized,
And strong antijamming capability, it is widely used in all types of electronic equipments, carries the task of data communication.
In traditional RS485 telecommunication circuit, due to the requirement of electrical isolation characteristic, increase in RS485 telecommunication circuit
Isolation optocoupler.Although the increase of isolation optocoupler solves the problems, such as electrical isolation, also the RS485 with isolation optocoupler is led to
The traffic rate of letter circuit has been limited in 9600bps or 19200bps.However, with the development of technology today, communication data
Amount increased dramatically, and the traffic rate of traditional RS485 telecommunication circuit with isolation optocoupler can no longer meet present lead to
Letter demand.
Traditional low speed optocoupler is replaced with into high speed photo coupling, traffic rate can be preferably solved the problems, such as, so that RS485
The communication speed of telecommunication circuit is obviously improved.But the cost of high speed photo coupling is high, and reliability is relatively low, thus
The performance of RS485 telecommunication circuit is seriously affected.
Utility model content
One of the purpose of this utility model be to provide a kind of low in cost, traffic rate is fast and high reliablity it is novel from
Machine mode RS485 telecommunication circuit.
The two of the purpose of this utility model are to provide a kind of measuring instrument, the measuring instrument include it is described it is novel from
Machine mode RS485 telecommunication circuit.
This novel slave mode RS485 telecommunication circuit provided by the utility model, including RS485 communication chip, chip
Enabled module, the quick receiving module of serial ports and the quick sending module of serial ports, the RS485 bus end output of RS485 communication chip
The serial ports receiving end of RS485 signal of communication, RS485 communication chip connects rs 232 serial interface signal by the quick receiving module of serial ports of concatenation
Receiving end；The serial ports transmitting terminal of RS485 communication chip connects the hair of rs 232 serial interface signal by the quick sending module of serial ports of concatenation
Sending end；The enable end of RS485 communication chip enables module by the chip of concatenation and connects enable signal.
The novel slave mode RS485 telecommunication circuit further includes RS485 protective module；RS485 protective module concatenation
In the total line output terminal of the RS485 of RS485 communication chip, for being protected to RS485 bus.
The RS485 protective module includes protection pull down resistor, protection pull-up resistor, insurance and protection TVS pipe；
One end of the total line output terminal of RS485 connects power supply signal by protection pull-up resistor to guarantee that the road silent status Xia Gai signal is
High level, the other end of the total line output terminal of RS485 connect earth signal by protection pull down resistor to guarantee to be somebody's turn to do under silent status
Road signal is low level, and insurance is serially connected on one end of the total line output terminal of RS485 to guarantee the reliable of RS485 bus circuit
Property, protection TVS pipe is attempted by between the both ends of the total line output terminal of RS485 for guaranteeing the reliability of RS485 bus circuit.
It includes enabled isolation optocoupler, enabled isolation optocoupler primary side current-limiting resistance and enabled isolation that the chip, which enables module,
Optocoupler exports pull-up resistor；Enable signal connects enabled isolation optocoupler by the enabled isolation optocoupler primary side current-limiting resistance of concatenation
Primary side cathode, the primary side anode for enabling isolation optocoupler connect power supply signal；The secondary side cathode of enabled isolation optocoupler is directly grounded, and is made
The secondary side anode of energy isolation optocoupler exports pull-up resistor by enabled isolation optocoupler and connects positive pole, while enabled isolation optocoupler
Secondary side anode be directly connected to the enable end of RS485 communication chip.
The quick receiving module of the serial ports includes receiving isolation optocoupler input current-limiting resistance, receiving isolation optocoupler, receive
Isolation optocoupler output pull down resistor receives isolation optocoupler output current limiting resistance, receives isolation optocoupler speed-up capacitor, receives isolation light
Coupling switching tube and reception isolation optocoupler export pull-up resistor；The serial ports receiving end of RS485 communication chip by concatenation reception every
From the primary side cathode that optocoupler input current-limiting resistance connection receives isolation optocoupler, the primary side anode for receiving isolation optocoupler is directly connected to electricity
Source signal；The secondary side anode for receiving isolation optocoupler is directly connected to power supply signal, and the secondary side cathode for receiving isolation optocoupler passes through reception
Isolation optocoupler output pull down resistor is directly grounded, receive isolation optocoupler secondary side cathode also pass through concatenation reception isolation optocoupler it is defeated
Current-limiting resistance connection receives the control terminal of isolation optocoupler switching tube out, receives isolation optocoupler speed-up capacitor and reception isolation optocoupler is defeated
Current-limiting resistance is in parallel out；Movable end one end ground connection of isolation optocoupler switching tube is received, the movable end other end is by receiving isolation light
Coupling exports pull-up resistor and connects positive pole, while receiving the movable end other end connection rs 232 serial interface signal of isolation optocoupler switching tube
Receiving end.
The quick sending module of the serial ports includes sending isolation optocoupler input current-limiting resistance, sending isolation optocoupler, send
Isolation optocoupler output pull down resistor sends isolation optocoupler output current limiting resistance, sends isolation optocoupler speed-up capacitor, sends isolation light
Coupling switching tube and transmission isolation optocoupler export pull-up resistor；The transmission isolation optocoupler input that the transmitting terminal of rs 232 serial interface signal passes through concatenation
Current-limiting resistance connection sends the primary side cathode of isolation optocoupler, and the primary side anode for sending isolation optocoupler is directly connected to power supply signal；Hair
The secondary side anode of isolation optocoupler is sent to be directly connected to power supply signal, the secondary side cathode for sending isolation optocoupler is defeated by sending isolation optocoupler
Pull down resistor is directly grounded out, and the secondary side cathode for sending isolation optocoupler also passes through the transmission isolation optocoupler output current limiting resistance of concatenation
Connection sends the control terminal of isolation optocoupler switching tube, sends isolation optocoupler speed-up capacitor and sends isolation optocoupler output current limiting resistance
It is in parallel；Movable end one end ground connection of isolation optocoupler switching tube is sent, the movable end other end is by sending isolation optocoupler output pull-up
Resistance connects positive pole, while sending the serial ports of the movable end other end connection RS485 communication chip of isolation optocoupler switching tube
Transmitting terminal.
The model MAX13085 of the RS485 communication chip.
The utility model additionally provides a kind of measuring instrument, and the measuring instrument includes the novel slave mode
RS485 telecommunication circuit.
This novel slave mode RS485 telecommunication circuit provided by the utility model and its measuring instrument, it is fast by serial ports
The design of fast sending module and the quick receiving module of serial ports can reach higher RS485 traffic rate using common optical coupler,
And the circuit cost of the utility model is cheap, high reliablity.
Detailed description of the invention
Fig. 1 is the functional block diagram of the utility model.
Fig. 2 is the circuit theory schematic diagram of the embodiments of the present invention one.
Specific embodiment
It is as shown in Figure 1 the functional block diagram of the utility model: this novel slave mode provided by the utility model
RS485 telecommunication circuit, including RS485 communication chip, chip enable module, the quick receiving module of serial ports, serial ports and quickly send mould
Block and RS485 protective module；The RS485 bus end of RS485 communication chip exports RS485 signal of communication, RS485 communication chip
Serial ports receiving end connects the receiving end of rs 232 serial interface signal by the quick receiving module of serial ports of concatenation；The serial ports of RS485 communication chip
Transmitting terminal connects the transmitting terminal of rs 232 serial interface signal by the quick sending module of serial ports of concatenation；The enable end of RS485 communication chip is logical
The chip for crossing concatenation enables module connection enable signal；RS485 protective module is serially connected in the RS485 bus of RS485 communication chip
Output end, for being protected to RS485 bus.
It is illustrated in figure 2 the circuit theory schematic diagram of the embodiments of the present invention one:
The model MAX13085 of RS485 communication chip；8 feet of chip is power pins and are directly connected to power supply signal,
5 feet of chip are directly grounded；6 feet and 7 feet of chip are the output end of RS485 bus, and 1 foot of chip is serial ports receiving end, core
2 feet and 3 feet of piece are enable end, and 4 feet of chip are serial ports transmitting terminal.
RS485 protective module includes protection pull down resistor R1, protection pull-up resistor R2, insurance F1 and protection TVS pipe D1；
6 feet of the total line output terminal of RS485 connect power supply signal by protection pull-up resistor to guarantee that the road silent status Xia Gai signal is
High level, 7 feet of the total line output terminal of RS485 connect earth signal by protection pull down resistor to guarantee that the road silent status Xia Gai is believed
It number is low level, insurance is serially connected on 6 feet of the total line output terminal of RS485 to guarantee reliability (the big energy of RS485 bus circuit
The interference signal of amount will not damage chip), protection TVS pipe, which is attempted by between 6 feet of the total line output terminal of RS485 and 7 foot both ends, to be used
In the reliability for guaranteeing RS485 bus circuit (interference signal of big energy will not damage chip).
It includes enabled isolation optocoupler U3, enabled isolation optocoupler primary side current-limiting resistance R7 and enabled isolation light that chip, which enables module,
Coupling exports pull-up resistor R8；Enable signal connects enabled isolation optocoupler by the enabled isolation optocoupler primary side current-limiting resistance of concatenation
Primary side cathode, the primary side anode for enabling isolation optocoupler connect power supply signal；The secondary side cathode of enabled isolation optocoupler is directly grounded, and is made
The secondary side anode of energy isolation optocoupler exports pull-up resistor by enabled isolation optocoupler and connects positive pole, while enabled isolation optocoupler
Secondary side anode be directly connected to the enable end of RS485 communication chip.When 485_RD/DE signal is low level, isolation optocoupler is enabled
Primary side conducting, enables the secondary side conducting of optocoupler at this time, and 2 feet and 3 feet of RS485 communication chip are the core at this time down for low level
Piece is enabled effective.
The quick receiving module of serial ports include receive isolation optocoupler input current-limiting resistance R6, receive isolation optocoupler U2, receive every
From optocoupler output pull down resistor R5, receive isolation optocoupler output current limiting resistance R4, receive isolation optocoupler speed-up capacitor C1, receive every
From optical coupled switch pipe Q3 (using triode) and receive isolation optocoupler output pull-up resistor R3；The serial ports of RS485 communication chip connects
Receiving end inputs the primary side cathode that current-limiting resistance connection receives isolation optocoupler by the reception isolation optocoupler of concatenation, receives isolation optocoupler
Primary side anode be directly connected to power supply signal；The secondary side anode for receiving isolation optocoupler is directly connected to power supply signal, receives isolation light
The secondary side cathode of coupling is directly grounded by receiving isolation optocoupler output pull down resistor, and the secondary side cathode for receiving isolation optocoupler also passes through
The reception isolation optocoupler output current limiting resistance connection of concatenation receives the control terminal of isolation optocoupler switching tube, receives isolation optocoupler and accelerates
Capacitor and reception isolation optocoupler output current limiting resistor coupled in parallel；Receive movable end one end ground connection of isolation optocoupler switching tube, movable end
The other end exports pull-up resistor connection positive pole by receiving isolation optocoupler, while receiving the movable end of isolation optocoupler switching tube
The receiving end of other end connection rs 232 serial interface signal.
When RS485 communication chip received signal is low level, 1 foot of chip is low level, the original of optocoupler U2 at this time
Side conducting, the secondary side conducting of optocoupler U2 at this time, 3 feet of optocoupler U2 are high level at this time, at this point, the ground level of Q3 is high level, hair
Emitter-base bandgap grading is low level, and Q3 is connected at this time, by 485_RXD signal down for low level, realizes the transmission of low-level data；It is similar
, when 1 foot of chip is high level, the secondary side cut-off of optocoupler U2, Q3 cut-off, 485_RXD signal are raised supreme electricity at this time
It is flat, realize the transmission of high level data.
When input signal (i.e. 1 foot signal of RS485 communication chip) becomes low level from high level, inside optocoupler U2
Phototriode by off state enters saturation state, and there are the regular hours, at this point, capacitor C1 charges rapidly, electric current is from dextrad
The voltage on a left side, electric left and right end is lower than right end, to accelerate the turn-on time of triode；When (i.e. RS485 communicates core to input signal
1 foot signal of piece) when becoming high level from low level, the phototriode inside optocoupler U2 enters off state by saturation state
There are the regular hours, at this point, capacitor C1 discharges rapidly, from left to right, capacitor left end voltage is low compared with right end, to accelerate for electric current
Deadline of triode Q1.Therefore, the presence of speed-up capacitor C1 keeps the rising edge of signal of communication and failing edge more precipitous,
To realize the quick transmitting and communication of signal.
The quick sending module of serial ports include send isolation optocoupler input current-limiting resistance R9, send isolation optocoupler U4, send every
From optocoupler output pull down resistor R10, send isolation optocoupler output current limiting resistance R11, transmission isolation optocoupler speed-up capacitor C2, transmission
Isolation optocoupler switching tube Q4 and transmission isolation optocoupler export pull-up resistor R12；The transmission that the transmitting terminal of rs 232 serial interface signal passes through concatenation
Isolation optocoupler inputs the primary side cathode that current-limiting resistance connection sends isolation optocoupler, and the primary side anode for sending isolation optocoupler is directly connected to
Power supply signal；The secondary side anode for sending isolation optocoupler is directly connected to power supply signal, and the secondary side cathode for sending isolation optocoupler passes through hair
Isolation optocoupler output pull down resistor is sent to be directly grounded, the secondary side cathode for sending isolation optocoupler also passes through the transmission isolation optocoupler of concatenation
The connection of output current limiting resistance sends the control terminal of isolation optocoupler switching tube, sends isolation optocoupler speed-up capacitor and sends isolation optocoupler
Output current limiting resistor coupled in parallel；Movable end one end ground connection of isolation optocoupler switching tube is sent, the movable end other end is by sending isolation
Optocoupler exports pull-up resistor and connects positive pole, while the movable end other end connection RS485 for sending isolation optocoupler switching tube is logical
Believe the serial ports transmitting terminal of chip.
When 485_TXD signal is low level, the primary side conducting of optocoupler U4, the secondary side conducting of optocoupler U4 at this time, this time
3 feet of coupling U4 are high level, at this point, the ground level of Q4 is high level, transmitting extremely low level, therefore Q4 conducting, RS485 is communicated
4 foot signals of chip realize the transmission of low-level data down for low level；Similar, when 485_TXD signal is high level
When, the secondary side cut-off of optocoupler U4, Q4 cut-off, 4 foot signals of RS485 communication chip are pulled to high level at this time, realize high electricity
The transmission of flat data.
When input signal 485_TXD becomes low level from high level, the phototriode inside optocoupler is by off state
Into saturation state, there are the regular hours, at this point, capacitor C2 charges rapidly, electric current from left to right, the voltage ratio of capacitor right end
Left end is low, to accelerate the turn-on time of triode；When input signal 485_TXD becomes high level from low level, optocoupler
Internal phototriode by saturation state enters off state, and there are the regular hours, at this point, capacitor C2 discharges rapidly, electric current
From right to left, capacitor right end voltage is low compared with left end, to accelerate the deadline of triode Q4.Therefore, speed-up capacitor C2
In the presence of, keep the rising edge of signal of communication and failing edge more precipitous, thus realize signal it is quick transmitting and communication.
By test, the circuit of the embodiments of the present invention one, important performance indexes are as follows:
1 circuit performance index of table
Meanwhile by test, the traffic rate of circuit as shown in Figure 2, RS485 bus can achieve 38400bps.
Therefore, this novel slave mode RS485 telecommunication circuit provided by the utility model is guaranteeing low in cost and high reliablity
On the basis of, greatly improve the traffic rate of RS485 bus.
It is novel to can be used for other any need progress for this novel slave mode RS485 telecommunication circuit provided by the present application
The electronic equipment of slave mode RS485 telecommunication circuit, including all types of measuring instrument (such as electric energy meter, water meter, gas meter, flow meter,
Calorimeter etc.), electric energy management terminal, distribution terminal, electric energy quality monitoring equipment, grid automation terminal, acquisition terminal, concentration
Device, data collector, measuring instrument, write by hand device, fault detector etc..
Claims (8)
1. a kind of novel slave mode RS485 telecommunication circuit, it is characterised in that including RS485 communication chip, chip enable module,
The quick receiving module of serial ports and the quick sending module of serial ports, the RS485 bus end output RS485 communication letter of RS485 communication chip
Number, the serial ports receiving end of RS485 communication chip connects the receiving end of rs 232 serial interface signal by the quick receiving module of serial ports of concatenation；
The serial ports transmitting terminal of RS485 communication chip connects the transmitting terminal of rs 232 serial interface signal by the quick sending module of serial ports of concatenation；RS485
The enable end of communication chip enables module by the chip of concatenation and connects enable signal.
2. novel slave mode RS485 telecommunication circuit according to claim 1, it is characterised in that further include RS485 protection
Module；RS485 protective module is serially connected in the total line output terminal of RS485 of RS485 communication chip, for protecting to RS485 bus
Shield.
3. novel slave mode RS485 telecommunication circuit according to claim 2, it is characterised in that the RS485 protection
Module includes protection pull down resistor, protection pull-up resistor, insurance and protection TVS pipe；One end of the total line output terminal of RS485 passes through guarantor
Shield pull-up resistor connection power supply signal to guarantee silent status Xia Gai road signal be high level, the total line output terminal of RS485 it is another
One end connects earth signal by protection pull down resistor to guarantee that silent status Xia Gai road signal is low level, and insurance is serially connected in
Guarantee that the reliability of RS485 bus circuit, protection TVS pipe are attempted by RS485 bus on one end of the total line output terminal of RS485
For guaranteeing the reliability of RS485 bus circuit between the both ends of output end.
4. novel slave mode RS485 telecommunication circuit according to claim 1, it is characterised in that the chip enables mould
Block includes that enabled isolation optocoupler, enabled isolation optocoupler primary side current-limiting resistance and enabled isolation optocoupler export pull-up resistor；Enabled letter
The primary side cathode that enabled isolation optocoupler number is connected by the enabled isolation optocoupler primary side current-limiting resistance of concatenation, enables isolation optocoupler
Primary side anode connects power supply signal；The secondary side cathode of enabled isolation optocoupler is directly grounded, and the secondary side anode for enabling isolation optocoupler is logical
Enabled isolation optocoupler output pull-up resistor connection positive pole is crossed, while the secondary side anode of enabled isolation optocoupler is directly connected to
The enable end of RS485 communication chip.
5. novel slave mode RS485 telecommunication circuit according to claim 1, it is characterised in that the fast quick access of the serial ports
Receiving module includes receiving isolation optocoupler input current-limiting resistance, receiving isolation optocoupler, receive isolation optocoupler output pull down resistor, receive
Isolation optocoupler output current limiting resistance, reception isolation optocoupler speed-up capacitor, reception isolation optocoupler switching tube and reception isolation optocoupler are defeated
Pull-up resistor out；The serial ports receiving end of RS485 communication chip inputs current-limiting resistance by the reception isolation optocoupler of concatenation and connects
The primary side cathode of isolation optocoupler is received, the primary side anode for receiving isolation optocoupler is directly connected to power supply signal；Receive the pair of isolation optocoupler
Side anode is directly connected to power supply signal, and the secondary side cathode for receiving isolation optocoupler is direct by receiving isolation optocoupler output pull down resistor
Ground connection, the secondary side cathode for receiving isolation optocoupler also pass through the reception isolation optocoupler output current limiting resistance connection reception isolation light of concatenation
The control terminal of coupling switching tube receives isolation optocoupler speed-up capacitor and receives isolation optocoupler output current limiting resistor coupled in parallel；Receive isolation
Movable end one end of optical coupled switch pipe is grounded, and the movable end other end is exporting pull-up resistor connection power supply just by receiving isolation optocoupler
Pole, while receiving the receiving end of the movable end other end connection rs 232 serial interface signal of isolation optocoupler switching tube.
6. novel slave mode RS485 telecommunication circuit according to claim 1, it is characterised in that the serial ports is quickly sent out
Sending module includes sending isolation optocoupler input current-limiting resistance, sending isolation optocoupler, send isolation optocoupler output pull down resistor, send
Isolation optocoupler output current limiting resistance, transmission isolation optocoupler speed-up capacitor, transmission isolation optocoupler switching tube and transmission isolation optocoupler are defeated
Pull-up resistor out；The transmitting terminal of rs 232 serial interface signal inputs current-limiting resistance connection by the transmission isolation optocoupler of concatenation and sends isolation optocoupler
Primary side cathode, the primary side anode for sending isolation optocoupler is directly connected to power supply signal；Send the secondary side anode of isolation optocoupler directly
Power supply signal is connected, the secondary side cathode for sending isolation optocoupler is directly grounded by sending isolation optocoupler output pull down resistor, is sent
The transmission isolation optocoupler output current limiting resistance connection that the secondary side cathode of isolation optocoupler also passes through concatenation sends isolation optocoupler switching tube
Control terminal, send isolation optocoupler speed-up capacitor and send isolation optocoupler output current limiting resistor coupled in parallel；Send isolation optocoupler switch
Movable end one end of pipe is grounded, and the movable end other end exports pull-up resistor connection positive pole by sending isolation optocoupler, simultaneously
Send the serial ports transmitting terminal of the movable end other end connection RS485 communication chip of isolation optocoupler switching tube.
7. novel slave mode RS485 telecommunication circuit described according to claim 1~one of 6, it is characterised in that described
The model MAX13085 of RS485 communication chip.
8. a kind of measuring instrument, it is characterised in that include novel slave mode RS485 described in one of claim 1~7 logical
Believe circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920027214.6U CN209072482U (en) | 2019-01-08 | 2019-01-08 | Novel slave mode RS485 telecommunication circuit and its measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920027214.6U CN209072482U (en) | 2019-01-08 | 2019-01-08 | Novel slave mode RS485 telecommunication circuit and its measuring instrument |
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| CN209072482U true CN209072482U (en) | 2019-07-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114756498A (en) * | 2020-12-29 | 2022-07-15 | Tcl科技集团股份有限公司 | Chip, master control chip, chip communication method, chip array and related equipment |
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2019
- 2019-01-08 CN CN201920027214.6U patent/CN209072482U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114756498A (en) * | 2020-12-29 | 2022-07-15 | Tcl科技集团股份有限公司 | Chip, master control chip, chip communication method, chip array and related equipment |
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