CN102571061A - Wire holder for serial port junctor management check instruction type 8K paths of sensors and 28N/2 groups of household electrical appliances - Google Patents
Wire holder for serial port junctor management check instruction type 8K paths of sensors and 28N/2 groups of household electrical appliances Download PDFInfo
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- CN102571061A CN102571061A CN2010106167147A CN201010616714A CN102571061A CN 102571061 A CN102571061 A CN 102571061A CN 2010106167147 A CN2010106167147 A CN 2010106167147A CN 201010616714 A CN201010616714 A CN 201010616714A CN 102571061 A CN102571061 A CN 102571061A
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Abstract
A wire holder for serial port junctor management check instruction type 8K paths of sensors and 28N/2 groups of household electrical appliances is an interface device of a computer and household electrical appliances. The 28N/2 groups of electronic and electrical appliances are managed by combining TXD (Transmit Data) of a serial port with two junctors, and the 8K (K=1, 2, 3, etc.) paths of sensors are detected by one input junctor. The wire holder comprises an RS232C (Recommend Standard 232C) interface, a USB (Universal Serial Bus) interface, an RS232=TTL/CMOS (Transistor-Transistor Logic/Complementary Metal-Oxide-Semiconductor Transistor) level conversion circuit, an 8bit*N serial-in parallel-out shift register, 28N 8bit*N data comparator circuits, 28N/2 RS trigger circuits, 28N/2 groups of electronic switching circuits, an 8bit*K parallel-in serial-out shift register and a stabilized power supply circuit. RTS (Remote Terminal System) is used as a clock signal of the two shift registers, DTR (Data Terminal Ready) is respectively used as a serial input signal of the 8bit*N serial-in parallel-out shift register and a data shift/loading control signal of the 8bit*K parallel-in serial-out shift register, TXD (Transmit Data) is used as an output allow control signal of the comparator circuits, the 28N/2 RS trigger circuits and the 28N/2 groups of electronic switching circuits are controlled by the outputs of the comparator circuits, and a serial output signal of the 8bit*K parallel-in serial-out shift register is received by CTS (Clear to Send). Thus the networking functions of the prior electronic and electrical appliances can be realized.
Description
Technical field
The invention belongs to the application electric technology field, particularly relate to a kind of computer of household electrical appliance automation and interface arrangement of domestic electronic and electrical equipment realized.
Background technology
" serial port interconnection management core is to instruction type No. 8 transducers 2 for the utility model of submitting to the same period Patent Office of State Intellectual Property Office to examine
8N/ 2 groups of household electrical appliances junction blocks " have identical technical foundation with " serial port interconnection management core is to 128 groups of household electrical appliances junction blocks of instruction type 8K road transducer ": on the one hand; rely on an input interconnection of serial port to detect multi-path digital amount output type transducer; on the other hand, send out the binary data instruction through two output interconnections of serial port, and send the output of data wire TXD control data instruction; adopt the data comparator technology, management many groups domestic electronic and electrical equipment with it.
Summary of the invention
The object of the present invention is to provide a kind of serial port interconnection management core to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks are the interface arrangements between a kind of computer and the home electronic appliance, and it is main frame with the computer, and application data comparator technology is used the two output interconnections and the transmission data wire TXD management 2 of its serial port
8N/ 2 (N=1,2,3 ...) and group domestic electronic and electrical equipment, simultaneously, rely on an input interconnection of serial port detect 8K (K=1,2,3 ...) and the output state of road digital quantity output type transducer; Comprise: RS232C interface, USB interface, USB change the serial port circuit,
Level shifting circuit, 8bit * N SI PO shift register, 2
8NIndividual 8bit * N data comparator circuit, 2
8N/ 2 rest-set flip-flop circuit, 2
8N/ 2 groups of electronic switching circuits, 8bit * K incorporate into go here and there out shift register, 8K (K=1,2,3 ...) and to sensor terminals, voltage-stabilized power supply circuit, anti-thunderbolt and surge circuit and power line and plug thereof.
The technical solution adopted for the present invention to solve the technical problems is:
USB interface is connected to the corresponding signal input part that USB changes the serial port circuit, the corresponding port line parallel of the latter's signal output part and RS232C interface; The 5th pin GND of RS232C interface is connected to power cathode, and its 4th pin DTR, the 7th pin RTS, the 3rd pin TXD are connected respectively to
A RS232C level signal input of level shifting circuit; The TTL/CMOS level signal output of the corresponding RTS of this level shifting circuit is connected respectively to 8bit * N SI PO shift register and 8bit * K to be incorporated into and goes here and there out the clock signal input terminal of shift register; Serial signal input and the 8bit * K that the TTL/CMOS level signal output of the corresponding DTR of this level shifting circuit is connected respectively to 8bit * N SI PO shift register incorporates into and goes here and there out the parallel input data displacement/loading control end of shift register, and the TTL/CMOS level signal output of this level shifting circuit correspondence TXD is connected to 2
8NThe comparative result A=B signal output of individual 8bit * N data comparator circuit allows control end
, also connect a pull-up resistor to positive source; The 8th pin CTS of serial port is connected to
A RS232C level signal output of level shifting circuit, the TTL/CMOS level signal input of corresponding therewith this level shifting circuit are connected to 8bit * K to be incorporated into and goes here and there out the serial signal output of shift register; 8 * N signal output part of 8bit * N SI PO shift register (for example: Q
15Q
14... Q
2Q
1Q
0(N=2)) with 2
8NOne group of comparison signal input of individual 8bit * N data comparator circuit (for example: A
15A
14... A
2A
1A
0(N=2)) parallel connection in regular turn, 2
8N2 of individual 8bit * N data comparator circuit
8NIndividual comparative result A=B signal output part connects a pull down resistor respectively to power cathode, also is connected to 2 in regular turn respectively
8N2 of/2 rest-set flip-flop circuit
8N/ 2 opposed 1 end S and reset terminal R; 2
8N2 of/2 rest-set flip-flop circuit
8N/ 2 output Q are connected respectively to the signal input end of one group of electronic switching circuit; The ac input end of voltage-stabilized power supply circuit is parallelly connected with anti-thunderbolt and surge circuit, receives civil power through power line and plug thereof.
8bit * N SI PO shift register is made up of the cascade of N piece 8bit SI PO shift register.
8bit * K incorporates into and goes here and there out shift register and be made up of K piece 74HC165 cascade; Their sheet choosing end is all received power cathode; Its clock signal input terminal all links together; Constitute the clock signal input terminal of said shift register, the 1st cascade carry signal input DS receives the positive pole of power supply, its serial signal output Q
HBe connected to the 2nd serial signal input B, the 2nd serial signal output Q
HBe connected to the 3rd cascade carry signal input DS, and the like, the serial signal output Q of K-1 piece
HBe connected to the cascade carry signal input DS of K piece, the serial signal output Q of K piece
HSerial signal output as said shift register; The 8K of said shift register parallel signal input connects a pull-up resistor respectively to positive source, also respectively with power cathode constitute 8K (K=1,2,3 ...) and to sensor terminals.
2
8NIndividual 8bit * N data comparator circuit is by 2
8NIndividual 8bit * N binary data comparator is formed, and each 8bit * N binary data comparator has two groups of comparison signal inputs, for example: A
15A
14... A
2A
1A
0And B
15B
14... B
2B
1B
0(N=2), one group of comparison signal input of each 8bit * N binary data comparator, for example: A
15A
14... A
2A
1A
0(N=2), parallel connection in regular turn constitutes 2 respectively
8NOne group of comparison signal input of individual 8bit * N data comparator circuit, for example: A
15A
14... A
2A
1A
0(N=2); Another group comparison signal input of each 8bit * N binary data comparator, for example: B
15B
14... B
2B
1B
0(N=2), be connected respectively to the common port of a single-pole double-throw switch (SPDT), so have 8 * N * 2
8NIndividual single-pole double-throw switch (SPDT), the two ends in addition of these single-pole double-throw switch (SPDT)s are connected respectively to positive source and power cathode; Each 8bit * N binary data comparator also has the signal output part of a comparative result A=B and a comparative result A=B signal output to allow control end
, the former high level is effective, constitutes 2 altogether
8N2 of individual 8bit * N data comparator circuit
8NIndividual comparative result A=B signal output part, latter's low level is effective, each
Parallel connection constitutes 2
8NThe comparative result A=B signal output of individual 8bit * N data comparator circuit allows control end
8bit * N binary data comparator is formed by the combination of 8bit binary data comparator, and a 8bit binary data comparator is formed by the combination of 4bit binary data comparator.
Voltage-stabilized power supply circuit is made up of power transformer, diode bridge rectifier circuit, capacitor filter and circuit of three-terminal voltage-stabilizing integrated 7806, and two outputs of 7806 have constituted the positive source and the power cathode of this device respectively.
Anti-thunderbolt and surge circuit are made up of a fuse and a piezo-resistance polyphone.
level shifting circuit combines four electrochemical capacitors to form by two MAX232.
2
8N/ 2 groups of electronic switching circuits comprise 2
8N/ 2 groups of electronic switching circuits, each structure of organizing electronic switching circuit is identical, comprises separately: No. 1 alternating current electronic switching circuit and 1 road light current electronic switching circuit.
The alternating current electronic switching circuit comprises: 1 NPN triode, 1 PNP triode, 1 base resistance, 1 base biasing resistor, 1 collector resistance, 1 current limliting are with collector resistance, a light-emitting diode and a solid-state relay; Wherein, The base stage of one termination NPN triode of base resistance; The other end is as the signal input end of this group electronic switching circuit, and base biasing resistor is connected in parallel on the emitter junction of PNP triode, and the emitter of this PNP triode connects positive source; Its base stage is connected with the collector electrode of collector resistance, light-emitting diode and NPN triode; The emitter of NPN triode is connected to power cathode, and current limliting of the collector electrode of PNP triode series connection is connected to the positive pole in the signal input end of solid-state relay with collector resistance, and the negative pole in the signal input end of solid-state relay is connected to power cathode; Two outputs of solid-state relay constitute the output of this alternating current electronic switching circuit.
The light current electronic switching circuit comprises: triode and base resistance, a diode and a direct current relay; Wherein, The base stage of one termination triode of base resistance; The other end is as the signal input end of this group electronic switching circuit; The emitter of triode is connected to power cathode, and its collector electrode is connected respectively to the end of coil of positive pole and the direct current relay of diode, and the other end of the negative pole of diode and the coil of direct current relay all is connected to positive source; Six terminals of two pairs of single-pole double-throw switch (SPDT)s of direct current relay have constituted the output of this light current electronic switching circuit.
The present invention has constituted the interface between computer and the home electronic appliance.On the one hand; It is with two output interconnection output order data of serial port; And to send the output of data wire control command data; And the word length of the concatenation technology extended instruction of employing SI PO shift register, the binding data comparator is technological again, can expand the number of the electronic apparatus that needs management as required.On the other hand, its adopts to incorporate into and goes here and there out the concatenation technology of shift register, only uses an input interconnection just can detect the state of 8K Sensor of Switch-Output Type.Its advantage is: said method is more complete; Need not adopt the one chip microcomputer chip; Be particularly suitable for these three unit combination of a comparator circuit, rest-set flip-flop and electronic switch to single electrical equipment itself, be used for the existing electrical equipment of upgrading, make it to adapt to network management.
Description of drawings
Below in conjunction with accompanying drawing, further specify the present invention.
Fig. 1 is the sensor interface circuitry part of circuit theory diagrams of the present invention, wherein, and K=2, S
16..., S
01Representative sensor.
Fig. 2 is the transmission data command part of circuit theory diagrams of the present invention, the situation of corresponding N=2.
Fig. 3 is the schematic diagram of one group of electronic switching circuit.
Fig. 4 is made up of the circuit theory diagrams of a 8bit binary data comparator 4bit binary data comparator.
Among the figure, 001.-32768. electronic switching circuit, 11., 12.
Level shifting circuit, 13., the 14.8bit SI PO shift register, 15.2
8NThe individual rest-set flip-flop circuit of/2 (=65536/2=32768 (N=2)), 16., 17.8bit incorporates into and go here and there out shift register, 31. single-pole double throw direct current electromagnetic relays; 32. solid-state relay SSR, 5. voltage-stabilized power supply circuit, 51. anti-thunderbolt and surge circuit; 6.USB interface; 7.USB change the serial port circuit, 8.RS232C interface, 9.2
8NIndividual 8bit * N data comparator circuit, 91.-93.4bit binary data comparator.
Embodiment
Incorporate into by 8bit and to go here and there out shift register (16), (17) cascade and form 8bit * K and incorporate that to go here and there out the method for shift register (K=2) as shown in Figure 1 into.
The method of being made up of 8bit * N SI PO shift register (N=2) 8bit SI PO shift register (13) and (14) cascade is as shown in Figure 2.Wherein, being in highest order in the output of the 74HC164 (13) than low level is connected to of the 74HC164 (14) that is in high bit and seals in signal input part B.
Method with 3 tetrad data comparator integrated circuits (91), the 8bit binary data comparator in (92) and (93) composition is as shown in Figure 4.Among the figure, one group of data input pin A of comparator (92) and (91)
3A
2A
1A
0, A
3A
2A
1A
0Constituted one group of comparison signal input A of this comparator successively
7A
6A
5A
4A
3A
2A
1A
0Another group data input pin B of comparator (92) and (91)
3B
2B
1B
0, B
3B
2B
1B
0Constituted another group comparison signal input B of this comparator successively
7B
6B
5B
4B
3B
2B
1B
0, they come the prepositioned instruction sign indicating number by eight single-pole double-throw switch (SPDT)s.Utilize one group of data input pin B of comparator (93)
3B
2B
1B
0Highest order B
3Constitute the output of comparative result A=B signal and allow control end
If, promptly
The A=B signal output part of comparator (93) is always low level.Therefore, the pull down resistor R among Fig. 2
000..., R
65535Can.
According to above-mentioned principle, a 8bit * N data comparator can be formed by several 8bit binary data comparator combinations, and 2
8NIndividual 8bit * N data comparator circuit (9) can be by 2
8NIndividual 8bit * N data comparator composes in parallel.
Obviously; Can influence 8bit * N in the time of operation 8bit * N SI PO shift register (13) and (14) incorporates into and goes here and there out the operating state of shift register (16) and (17); At this moment, we do not go to be concerned about that the event attribute of serial communication control MSComm32.OCX is just passable.And operation 8bit * N incorporates the operating state that also can influence 8bit * N SI PO shift register (13) and (14) when going here and there out shift register (16) and (17) into; At this moment; As long as serial port data transmission line TXD does not send any data; Serial port sends line and is in high level: TXD=1 at ordinary times, just can be so that 2
8NThe comparative result A=B signal output of individual 8bit * N data comparator circuit (9) allows control end
Be in the high level disarmed state, therefore, they are 2 years old
8NIndividual comparative result A=B signal output part all is in low level state, does not influence 2
8NEach of/2 (=65536/2=32768 (N=2)) individual rest-set flip-flop circuit (15) guaranteed that to R, S control end misoperation does not take place in electronic switching circuit (001)-(32768).
Operation 8bit * N incorporates into and goes here and there out shift register (16) and (17) and need utilize the event attribute of serial communication control MSComm32.OCX, and comprising: 1) ComEvSend: the number of characters in the transmission register also lacks than Sthreshold; 2) ComEvReceive: receive Sthreshold character, this incident continues to produce up to removing from receiving register with the Input attribute; 3) state of ComEvCTS:Clear_to_Send line changes; 4) state of ComEvDSR:Data_Set_Ready line changes to 0 from 1; 5) state of ComEvCD:Carrier_Detect line changes; 6) ComEvRing: detect bell signal; But; The attribute MSComm32.CTSholding/.DSRholding/.DCDholding that does not possess the serial communication control can't inquire about the height situation that detects its level, and some UART (asynchronous reception-transmitter) possibly not support this incident; 7) ComEvEOF: receive the end of data (ASCII is 26) character.
Claims (10)
1. serial port interconnection management core is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks is characterized in that: comprise RS232C interface, USB interface, USB change the serial port circuit,
Level shifting circuit, 8bit * N SI PO shift register, 2
8NIndividual 8bit * N data comparator circuit, 2
8N/ 2 rest-set flip-flop circuit, 2
8N/ 2 groups of electronic switching circuits, 8bit * K incorporate into go here and there out shift register, 8K (K=1,2,3 ...) and to sensor terminals, voltage-stabilized power supply circuit, anti-thunderbolt and surge circuit and power line and plug thereof; Wherein, USB interface is connected to the corresponding signal input part that USB changes the serial port circuit, the corresponding port line parallel of the latter's signal output part and RS232C interface; The 5th pin GND of RS232C interface is connected to power cathode, and its 4th pin DTR, the 7th pin RTS, the 3rd pin TXD are connected respectively to
A RS232C level signal input of level shifting circuit; The TTL/CMOS level signal output of the corresponding RTS of this level shifting circuit is connected respectively to 8bit * N SI PO shift register and 8bit * K to be incorporated into and goes here and there out the clock signal input terminal of shift register; Serial signal input and the 8bit * K that the TTL/CMOS level signal output of the corresponding DTR of this level shifting circuit is connected respectively to 8bit * N SI PO shift register incorporates into and goes here and there out the parallel input data displacement/loading control end of shift register, and the TTL/CMOS level signal output of this level shifting circuit correspondence TXD is connected to 2
8NThe comparative result A=B signal output of individual 8bit * N data comparator circuit allows control end
Also connect a pull-up resistor to positive source; The 8th pin CTS of serial port is connected to
A RS232C level signal output of level shifting circuit, the TTL/CMOS level signal input of corresponding therewith this level shifting circuit are connected to 8bit * K to be incorporated into and goes here and there out the serial signal output of shift register; 8 * N signal output part of 8bit * N SI PO shift register and 2
8NOne group of comparison signal input of individual 8bit * N data comparator circuit is parallel connection in regular turn, and 2
8N2 of individual 8bit * N data comparator circuit
8NIndividual comparative result A=B signal output part connects a pull down resistor respectively to power cathode, also is connected to 2 in regular turn respectively
8N2 of/2 rest-set flip-flop circuit
8N/ 2 opposed 1 end S and reset terminal R; 2
8N2 of/2 rest-set flip-flop circuit
8N/ 2 output Q are connected respectively to the signal input end of one group of electronic switching circuit; The ac input end of voltage-stabilized power supply circuit is parallelly connected with anti-thunderbolt and surge circuit, receives civil power through power line and plug thereof.
2. serial port interconnection management core according to claim 1 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks is characterized in that: 8bit * N SI PO shift register is made up of the cascade of N piece 8bit SI PO shift register.
3. serial port interconnection management core according to claim 1 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks; It is characterized in that: 8bit * K incorporates into and goes here and there out shift register and be made up of K piece 74HC165 cascade; Their sheet choosing end is all received power cathode, and its clock signal input terminal all links together, and constitutes the clock signal input terminal of said shift register; The 1st cascade carry signal input DS receives the positive pole of power supply, its serial signal output Q
HBe connected to the 2nd serial signal input B, the 2nd serial signal output Q
HBe connected to the 3rd cascade carry signal input DS, and the like, the serial signal output Q of K-1 piece
HBe connected to the cascade carry signal input DS of K piece, the serial signal output Q of K piece
HSerial signal output as said shift register; The 8K of said shift register parallel signal input connects a pull-up resistor respectively to positive source, also respectively with power cathode constitute 8K (K=1,2,3 ...) and to sensor terminals.
4. serial port interconnection management core according to claim 1 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks is characterized in that: 2
8NIndividual 8bit * N data comparator circuit is by 2
8NIndividual 8bit * N binary data comparator is formed, and each 8bit * N binary data comparator has two groups of comparison signal inputs, and one group of comparison signal input of each 8bit * N binary data comparator is parallel connection in regular turn respectively, constitutes 2
8NOne group of comparison signal input of individual 8bit * N data comparator circuit; Another group comparison signal input of each 8bit * N binary data comparator is connected respectively to the common port of a single-pole double-throw switch (SPDT), so have 8 * N * 2
8NIndividual single-pole double-throw switch (SPDT), the two ends in addition of these single-pole double-throw switch (SPDT)s are connected respectively to positive source and power cathode; Each 8bit * N binary data comparator also has the signal output part of a comparative result A=B and a comparative result A=B signal output to allow control end
, the former constitutes 2 altogether
8N2 of individual 8bit * N data comparator circuit
8NIndividual comparative result A=B signal output part, latter's parallel connection constitutes 2
8NThe comparative result A=B signal output of individual 8bit * N data comparator circuit allows control end
5. serial port interconnection management core according to claim 4 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks is characterized in that: 8bit * N binary data comparator is formed by the combination of 8bit binary data comparator, and a 8bit binary data comparator is formed by the combination of 4bit binary data comparator.
6. serial port interconnection management core according to claim 1 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks; It is characterized in that: voltage-stabilized power supply circuit is made up of power transformer, diode bridge rectifier circuit, capacitor filter and circuit of three-terminal voltage-stabilizing integrated 7806, and two outputs of 7806 have constituted the positive source and the power cathode of this device respectively.
7. serial port interconnection management core according to claim 1 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks is characterized in that: anti-thunderbolt and surge circuit are made up of a fuse and a piezo-resistance polyphone.
8. serial port interconnection management core according to claim 1 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks is characterized in that: 2
8N/ 2 groups of electronic switching circuits comprise 2
8N/ 2 groups of electronic switching circuits, each structure of organizing electronic switching circuit is identical, comprises No. 1 alternating current electronic switching circuit and 1 road light current electronic switching circuit separately.
9. serial port interconnection management core according to claim 8 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks is characterized in that: the alternating current electronic switching circuit comprises: 1 NPN triode, 1 PNP triode, 1 base resistance, 1 base biasing resistor, 1 collector resistance, 1 current limliting are with collector resistance, a light-emitting diode and a solid-state relay; Wherein, The base stage of one termination NPN triode of base resistance; The other end is as the signal input end of this group electronic switching circuit, and base biasing resistor is connected in parallel on the emitter junction of PNP triode, and the emitter of this PNP triode connects positive source; Its base stage is connected with the collector electrode of collector resistance, light-emitting diode and NPN triode; The emitter of NPN triode is connected to power cathode, and current limliting of the collector electrode of PNP triode series connection is connected to the positive pole in the signal input end of solid-state relay with collector resistance, and the negative pole in the signal input end of solid-state relay is connected to power cathode; Two outputs of solid-state relay constitute the output of this alternating current electronic switching circuit.
10. serial port interconnection management core according to claim 8 is to instruction type 8K road transducer 2
8N/ 2 groups of household electrical appliances junction blocks is characterized in that: the light current electronic switching circuit comprises: triode and base resistance, a diode and a direct current relay; Wherein, The base stage of one termination triode of base resistance; The other end is as the signal input end of this group electronic switching circuit; The emitter of triode is connected to power cathode, and its collector electrode is connected respectively to the end of coil of positive pole and the direct current relay of diode, and the other end of the negative pole of diode and the coil of direct current relay all is connected to positive source; Six terminals of two pairs of single-pole double-throw switch (SPDT)s of direct current relay have constituted the output of this light current electronic switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010616714.7A CN102571061B (en) | 2010-12-29 | 2010-12-29 | Wire holder for serial port junctor management check instruction type 8K paths of sensors and 28N/2 groups of household electrical appliances |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010616714.7A CN102571061B (en) | 2010-12-29 | 2010-12-29 | Wire holder for serial port junctor management check instruction type 8K paths of sensors and 28N/2 groups of household electrical appliances |
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| Publication Number | Publication Date |
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| CN102571061A true CN102571061A (en) | 2012-07-11 |
| CN102571061B CN102571061B (en) | 2014-07-30 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6806757B2 (en) * | 2002-09-02 | 2004-10-19 | Ricoh Company, Ltd. | Level shift circuit |
| CN201570020U (en) * | 2009-12-30 | 2010-09-01 | 成都前锋电子电器集团股份有限公司 | Automatic switching circuit of 485 interface and series port |
| CN202050400U (en) * | 2010-12-29 | 2011-11-23 | 重庆工商大学 | Serial port junctor management check instruction type 8K paths of sensor and 28N/2 groups of household electrical appliances wire holder |
-
2010
- 2010-12-29 CN CN201010616714.7A patent/CN102571061B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6806757B2 (en) * | 2002-09-02 | 2004-10-19 | Ricoh Company, Ltd. | Level shift circuit |
| CN201570020U (en) * | 2009-12-30 | 2010-09-01 | 成都前锋电子电器集团股份有限公司 | Automatic switching circuit of 485 interface and series port |
| CN202050400U (en) * | 2010-12-29 | 2011-11-23 | 重庆工商大学 | Serial port junctor management check instruction type 8K paths of sensor and 28N/2 groups of household electrical appliances wire holder |
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| Publication number | Publication date |
|---|---|
| CN102571061B (en) | 2014-07-30 |
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