CN107678998A - A kind of external serial server of toggle switch - Google Patents
A kind of external serial server of toggle switch Download PDFInfo
- Publication number
- CN107678998A CN107678998A CN201710949217.0A CN201710949217A CN107678998A CN 107678998 A CN107678998 A CN 107678998A CN 201710949217 A CN201710949217 A CN 201710949217A CN 107678998 A CN107678998 A CN 107678998A
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- Prior art keywords
- resistance
- voltage stabilizing
- toggle switch
- control chip
- directional voltage
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a kind of external serial server of toggle switch, including toggle switch and control chip, and being realized by way of external dial switch can set outside RS485 signal wires AB pull-up, pull down resistor and terminal coupling resistance.Pull down resistor and terminal coupling resistance whether can be put into during onsite application by changing the state of toggle switch, in selection.The change of toggle switch, the circuit dynamic parameter of bus is changed, so that 485 signals on circuit meet field demand；The invention provides 1K ohms and the upper pull down resistor of 10K ohms and 120 ohm of terminal coupling resistance.Terminal coupling resistance can change upper pull down resistor to match the load of 485 link serial ports with 485 serial ports link loads change load impedance characteristic in parallel, the upper pull down resistor of two pairs of different resistances.
Description
Technical field
The present invention relates to serial server technical field, specially a kind of external serial server of toggle switch.
Background technology
Application is mainly with 485 bus mode wiring to RS485 serial equipments at the scene.Bus length, the mode of connection, serial ports
The factor such as device type, live electromagnetic environment may all cause communications errors height occur, driving force deficiency.Current solution party
Case mainly reduces traffic rate, or outside increase repeater.Existing technical scheme is fixed inside serial equipment
Pull down resistor, fixed terminal build-out resistor can not scene flexibly selection.Can scene spirit using the serial equipment of external dial switch
Configuration living, upper pull down resistor mode is changed by toggle switch and changes the suitable field adjustable environment of driving force mode.Actual effect
Fruit is obvious.
The content of the invention
It is an object of the invention to provide a kind of external serial server of toggle switch, to solve to carry in above-mentioned background technology
The problem of going out.
To achieve the above object, the present invention provides following technical scheme：A kind of external serial server of toggle switch, including
Toggle switch and control chip, the pin of toggle switch one and two pin are all connected with VCC ends, and three pin and four pin are grounded；Six pin connect
Connecting resistance C one end, seven pin connection resistance D one end, octal connection resistance E one end, nine pin connection resistance F one end, ten pin connection electricity
G one end is hindered, the resistance C other ends connect the resistance D other ends and connect resistance H one end and control chip A ends；The resistance E is another
One end connects the resistance F other ends and connects resistance I one end and control chip B ends, resistance G other ends connection control chip B ends；
Another termination VCC ends of resistance H, resistance I other ends ground connection, the pin of the toggle switch five connection control chip A ends；
The control chip DE ends and RE ends connect resistance A one end respectively, and the control chip R ends connect resistance B one end,
The resistance A other ends and the resistance B other ends connect VCC ends, the control chip GND ends ground connection, and VCC ends and GND ends are indirectly
Enter electric capacity；
Also include bi-directional voltage stabilizing diode A, bi-directional voltage stabilizing diode B, bi-directional voltage stabilizing diode C, thermistor A, temperature-sensitive
Resistance B, described bi-directional voltage stabilizing diode A one end connect bi-directional voltage stabilizing diode 2b one end, thermistor A one end and control respectively
Chip B ends；Another termination RS485 signal ends of thermistor A；The bi-directional voltage stabilizing diode B other ends connect double respectively
To voltage-regulator diode C one end, thermistor B one end and control chip A ends；The bi-directional voltage stabilizing diode A other ends and two-way
The voltage-regulator diode C other ends are grounded；The thermistor B other ends connect RS485 signal ends.
Preferably, the resistance D and resistance F are pull-up resistor, and its resistance value is 1K ohms；The resistance C and electricity
It is pull down resistor to hinder E, and its resistance value is 10K ohms.
Preferably, the resistance G is terminal coupling resistance, and its resistance value is 120 ohm.
Preferably, the bi-directional voltage stabilizing diode A, bi-directional voltage stabilizing diode B, bi-directional voltage stabilizing diode c-type number use
SMBJ6.8CA。
Compared with prior art, the beneficial effects of the invention are as follows：The present invention is realized by way of external dial switch
RS485 signal wires AB pull-up, pull down resistor and terminal coupling resistance outside can be set.It can be opened during onsite application by changing dial-up
The state of pass, pull down resistor and terminal coupling resistance whether is put into selection.The change of toggle switch, change the circuit of bus
Dynamic parameter, so that 485 signals on circuit meet field demand；The invention provides 1K ohms and 10K ohms up and down
Pull-up resistor and 120 ohm of terminal coupling resistance.Terminal coupling resistance can be with 485 serial ports link loads change load impedance in parallel
Characteristic, the upper pull down resistor of two pairs of different resistances can change upper pull down resistor to match the load of 485 link serial ports.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Referring to Fig. 1, the present invention provides a kind of technical scheme：A kind of external serial server of toggle switch, including dial-up
Switch 1 and control chip 2, the pin of toggle switch 1 one and two pin are all connected with VCC ends, and three pin and four pin are grounded；Six pin connect
Resistance C3a one end, seven pin connection resistance D4a one end, octal connection resistance E5a one end, nine pin connection resistance F6a one end, ten pin
Resistance G7a one end is connected, the resistance C3a other ends connect the resistance D4a other ends and connect resistance H8a one end and control chip 2A
End；The resistance E5a other ends connect the resistance F6a other ends and connect resistance I9a one end and control chip 2B ends, resistance
G7a other ends connection control chip 2B ends；Another termination VCC ends of resistance H8a, resistance I9a other ends ground connection, the dial-up
Switch 1 five pin connection control chip 2A ends；
The control chip 2DE ends and RE ends connect resistance A1a one end respectively, and the control chip 2R ends connect resistance
B2a one end, the resistance A1a other ends and the resistance B2a other ends connect VCC ends, the control chip 2GND ends ground connection, and VCC ends
Electric capacity 3 is accessed between GND ends；
Also include bi-directional voltage stabilizing diode A1b, bi-directional voltage stabilizing diode B2b, bi-directional voltage stabilizing diode C3b, thermistor
A1c, thermistor B2c, bi-directional voltage stabilizing diode A1b, bi-directional voltage stabilizing diode B2b, bi-directional voltage stabilizing diode C3b models are adopted
Use SMBJ6.8CA；Described bi-directional voltage stabilizing diode A1b one end connects bi-directional voltage stabilizing diode B2b one end, thermistor respectively
A1c one end and control chip 2B ends；Another termination RS485 signal ends of thermistor A1c；The bi-directional voltage stabilizing diode
The B2b other ends connect bi-directional voltage stabilizing diode C3b one end, thermistor B2c one end and control chip 2A ends respectively；It is described two-way
The voltage-regulator diode A1b other ends and the bi-directional voltage stabilizing diode C3b other ends are grounded；The thermistor B2c other ends connection
RS485 signal ends.
Wherein, resistance D4a and resistance F6a is pull-up resistor, and its resistance value is 1K ohms；The resistance C3a and electricity
It is pull down resistor to hinder E5a, and its resistance value is 10K ohms；Resistance G7a is terminal coupling resistance, and its resistance value is 120 Europe
Nurse.The invention provides 1K ohms and the upper pull down resistor of 10K ohms and 120 ohm of terminal coupling resistance.Terminal coupling electricity
Resistance can and 485 serial ports link loads are in parallel changes load impedance characteristic, on the upper pull down resistors of two pairs of different resistances can change
Pull down resistor loads to match 485 link serial ports.
The present invention realizes RS485 signal wires AB pull-up, pull down resistor and terminal by way of external dial switch
It can be set with resistance outside.Pull down resistor and whether end can be put into during onsite application by changing the state of toggle switch, in selection
Hold build-out resistor.The change of toggle switch, the circuit dynamic parameter of bus is changed, so that 485 signals on circuit meet
Field demand.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (4)
1. a kind of external serial server of toggle switch, including toggle switch (1) and control chip (2), it is characterised in that：It is described
The pin of toggle switch (1) one and two pin are all connected with VCC ends, and three pin and four pin are grounded；Six pin connect resistance C (3a) one end, seven pin
Connect resistance D (4a) one end, octal connection resistance E (5a) one end, nine pin connection resistance F (6a) one end, ten pin connection resistance G
(7a) one end, resistance C (3a) other end connect resistance D (4a) other ends and connect resistance H (8a) one end and control chip (2)
A ends；Resistance E (5a) other end connects resistance F (6a) other ends and connects resistance I (9a) one end and control chip (2) B
End, resistance G (7a) other end connection control chip (2) B ends；Another termination VCC ends of resistance H (8a), resistance I (9a) are another
End ground connection, the pin of toggle switch (1) five connect control chip (2) A ends；
Control chip (2) the DE ends and RE ends connect resistance A (1a) one end respectively, and control chip (2) the R ends connect resistance
B (2a) one end, resistance A (1a) other ends and resistance B (2a) other end connect VCC ends, and control chip (2) the GND ends are grounded,
And electric capacity (3) is accessed between VCC ends and GND ends；
Also include bi-directional voltage stabilizing diode A (1b), bi-directional voltage stabilizing diode B (2b), bi-directional voltage stabilizing diode C (3b), temperature-sensitive electricity
A (1c), thermistor B (2c) are hindered, described bi-directional voltage stabilizing diode A (1b) one end connects bi-directional voltage stabilizing diode B (2b) respectively
One end, thermistor A (1c) one end and control chip (2) B ends；Another termination RS485 signal ends of thermistor A (1c)；
Bi-directional voltage stabilizing diode B (2b) other end connects bi-directional voltage stabilizing diode C (3b) one end, thermistor B (2c) one respectively
End and control chip (2) A ends；Bi-directional voltage stabilizing diode A (1b) other ends and bi-directional voltage stabilizing diode C (3b) other end is equal
Ground connection；Thermistor B (2c) other end connects RS485 signal ends.
A kind of 2. external serial server of toggle switch according to claim 1, it is characterised in that：The resistance D (4a)
It is pull-up resistor with resistance F (6a), its resistance value is 1K ohms；The resistance C (3a) and resistance E (5a) are drop-down electricity
Resistance, its resistance value is 10K ohms.
A kind of 3. external serial server of toggle switch according to claim 1, it is characterised in that：The resistance G (7a)
For terminal coupling resistance, its resistance value is 120 ohm.
A kind of 4. external serial server of toggle switch according to claim 1, it is characterised in that：The bi-directional voltage stabilizing two
Pole pipe A (1b), bi-directional voltage stabilizing diode B (2b), bi-directional voltage stabilizing diode C (3b) model use SMBJ6.8CA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710949217.0A CN107678998B (en) | 2017-10-12 | 2017-10-12 | A kind of external serial server of toggle switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710949217.0A CN107678998B (en) | 2017-10-12 | 2017-10-12 | A kind of external serial server of toggle switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107678998A true CN107678998A (en) | 2018-02-09 |
| CN107678998B CN107678998B (en) | 2019-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710949217.0A Active CN107678998B (en) | 2017-10-12 | 2017-10-12 | A kind of external serial server of toggle switch |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2629145Y (en) * | 2003-01-20 | 2004-07-28 | 北京安控科技发展有限公司 | RS-232 /RS-485 semi-duplex signal switching circuit |
| CN201514214U (en) * | 2009-09-23 | 2010-06-23 | 北京华电通达科技有限公司 | Portable video repairing instrument |
| CN202205048U (en) * | 2011-08-22 | 2012-04-25 | 株洲科瑞变流电气有限公司 | Communication controller |
| CN204360374U (en) * | 2015-01-07 | 2015-05-27 | 山东鲁能智能技术有限公司 | A kind of RS232/RS485 is two switches transformer station's integrated power supply supervising device |
| CN104734780A (en) * | 2014-12-29 | 2015-06-24 | 东莞市启鼎光电科技有限公司 | Passive light-splitting RS-485 optical fiber bus local side system |
-
2017
- 2017-10-12 CN CN201710949217.0A patent/CN107678998B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2629145Y (en) * | 2003-01-20 | 2004-07-28 | 北京安控科技发展有限公司 | RS-232 /RS-485 semi-duplex signal switching circuit |
| CN201514214U (en) * | 2009-09-23 | 2010-06-23 | 北京华电通达科技有限公司 | Portable video repairing instrument |
| CN202205048U (en) * | 2011-08-22 | 2012-04-25 | 株洲科瑞变流电气有限公司 | Communication controller |
| CN104734780A (en) * | 2014-12-29 | 2015-06-24 | 东莞市启鼎光电科技有限公司 | Passive light-splitting RS-485 optical fiber bus local side system |
| CN204360374U (en) * | 2015-01-07 | 2015-05-27 | 山东鲁能智能技术有限公司 | A kind of RS232/RS485 is two switches transformer station's integrated power supply supervising device |
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| Publication number | Publication date |
|---|---|
| CN107678998B (en) | 2019-10-15 |
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