CN202424693U - Display scanning circuit of time sharing multiplex keyboard for fire alarm controller - Google Patents
Display scanning circuit of time sharing multiplex keyboard for fire alarm controller Download PDFInfo
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- CN202424693U CN202424693U CN2011205265250U CN201120526525U CN202424693U CN 202424693 U CN202424693 U CN 202424693U CN 2011205265250 U CN2011205265250 U CN 2011205265250U CN 201120526525 U CN201120526525 U CN 201120526525U CN 202424693 U CN202424693 U CN 202424693U
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Abstract
The utility model discloses a display scanning circuit of a time sharing multiplex keyboard for a fire alarm controller. The display scanning circuit comprises a master control circuit, a keyboard scanning circuit, a display scanning circuit and a communication circuit; and the keyboard scanning circuit, the display scanning circuit and the communication circuit are connected with the master control circuit. The display scanning circuit of the time sharing multiplex keyboard for the fire alarm controller has the characteristics of simple usage, small volume, low cost, few occupation of CPU (Central Processing Unit) resources and the like.
Description
Technical field
The utility model relates to a kind of time-sharing multiplex keyboard reading scan circuit that is used for fire alarm control unit.
Background technology
Along with the high speed development of national economy, the scale of building is huge day by day, and automatic fire alarm system is gradually complicated, needs the interlocking equipment of control also more and more in the system.In order to ensure equipment reliable operation, generally all will be in Fire Autoalarm each interlock to be established a button and two status indicator lamps are set respectively, button is used to control its startup and stops, and indicator light is used to indicate equipment state.In the large-sized fire automatic alarm system, this type of button can both reach thousands of, and indicator light is more up to 1,000.
The keyboard-display circuit of Fire Autoalarm employing now mainly contains two kinds: and shape of the mouth as one speaks special chip and serial ports type special chip.And shape of the mouth as one speaks special chip is like INTEL 8279 circuit, and this circuit usage is simple, but the circuit own vol is big; It is more to take the CPU hardware resource, and the periphery also needs interlock circuit cooperatings such as decoder, driver, and it is more numerous and more jumbled that entire circuit implements; It is big to take up room, and cost is high.Serial ports type special chip is like circuit such as BC7291, ZLG7290, and the circuit usage is complicated, and the software code amount is big; It is more to take cpu resource, and the periphery also needs circuit cooperatings such as shift register, driver, and it is more numerous and more jumbled that entire circuit implements; It is big to take up room, and cost is high.
The utility model content
The utility model is the weak point that exists in the above-mentioned prior art for avoiding, and a kind of time-sharing multiplex keyboard reading scan circuit that is used for fire alarm control unit is provided, to solve that existing keyboard-display circuit takies that cpu resource is many, volume is big and problem such as cost height.
The utility model adopts following technical scheme for the technical solution problem.
Be used for the time-sharing multiplex keyboard reading scan circuit of fire alarm control unit, its design feature is to comprise governor circuit, keyboard scanning circuit, reading scan circuit and telecommunication circuit; Said keyboard scanning circuit, reading scan circuit and telecommunication circuit all are connected with said governor circuit;
Keyboard scanning circuit is used to obtain the keyboard signal of pressing and upspring, and sends the signal that obtains to governor circuit;
The reading scan circuit is used to obtain the control signal of governor circuit, and according to the switch of this control signal control LED light;
Telecommunication circuit is used for communicating by letter between governor circuit and the host computer, receives the outside display message that host computer sends, and detected button value is sent to host computer;
Governor circuit is used to receive the signal that keyboard scanning circuit, reading scan circuit and telecommunication circuit are sent, and the control signal that produces is sent to keyboard scanning circuit, reading scan circuit and telecommunication circuit.
The design feature of the time-sharing multiplex keyboard reading scan circuit that is used for fire alarm control unit of the utility model also is:
Said governor circuit comprises single-chip microcomputer D1, resistance R 5～R12, resistance R 18, capacitor C 7, capacitor C 8, capacitor C 10, crystal G1 and address wire jumper X3; Said capacitor C 7, capacitor C 8 and crystal G1 form a clock oscillation circuit, and D1 provides clock signal for single-chip microcomputer; Resistance R 18 is formed an electrify restoration circuit with capacitor C 10, for single-chip microcomputer provides reset signal; Address wire jumper X3 is used to dispose the mailing address of governor circuit; Resistance R 5～R12 constitutes a pull-up circuit, is used to strengthen the P0 mouth driving force of single-chip microcomputer D1; Single-chip microcomputer D1 realizes the function of supervisory keyboard matrix and LED matrix through P0 mouth, P1 mouth, P2 mouth supervisory keyboard scanning circuit and reading scan circuit.
Said keyboard scanning circuit comprises resistance R 16～R23, resistance R 43～R50, diode V128～V135, bus driver D3, bus driver D4 and keyboard matrix S0～S63; Bus driver D3, D4 and reading scan circuit are shared.Resistance R 16～R23 is a pull down resistor, is used to confirm not when being pressed, and what single-chip microcomputer D1 read through the P0 mouth all is low level; Resistance R 16～R23 also forms a bleeder circuit with resistance R 43～R50, and its voltage ratio guarantees that when having key to be pressed what single-chip microcomputer D1 read is high level; Diode V128～V135 forms an anti-button short circuit current, when two keys of same row are pressed simultaneously, prevents the horizontal scanning line short circuit that it is corresponding; Bus driver D3 time-sharing work is under two states: input and output, and the switching of its working method is controlled by single-chip microcomputer D1; In the keyboard scan period, bus driver D3 works in input state, and single-chip microcomputer D1 is through the line scan signals of bus driver D4 output key, and D3 reads key-press status through bus driver; 64 button S0～S63 are arranged in 8 buttons of every row, and one has 8 row, constitutes one 8 * 8 keyboard matrix.
Said reading scan circuit comprises resistance R 27～R42, bus driver D3, bus driver D4, bus driver D5 and LED matrix; Wherein bus driver D3, D4 and keyboard scanning circuit are shared.Resistance R 27～R42 is 16 current-limiting resistances, and the electric current when being used to limit LED and lighting prevents that bus driver is because of the excessive damage of electric current; Bus driver D3 works in output state in the reading scan period, and the B0 of bus driver D3～B7 pin is exported high level successively, circulates 2 times; Bus driver D4 and bus driver D5 be the output information sign indicating number successively, and during bus driver D4 output information sign indicating number, bus driver D5 output is high level entirely, and bus driver D5 is the output information sign indicating number successively, and bus driver D4 output is high level entirely; 128 LED lights are arranged in 8 LED lights of every row, and one has 16 row, constitutes one 16 * 8 LED matrix.
Said telecommunication circuit comprises resistance R 1～R4, serial ports transceiver D2, connector X1, jumper wire device X5; Serial ports transceiver D2 is used for the transmitting-receiving of serial data and the conversion of data level; Resistance R 1 is a pull-up resistor, serial ports transceiver D2 /when holding level with both hands, RE is in low level state, and make serial ports transceiver D2 be operated in accepting state; When needs send data, serial ports transceiver D2 /the RE end will transfer high level state to, and pull-up resistor R1 can provide and draw drive current, quickens the switching of serial ports transceiver operating state; Resistance R 2 is two current-limiting resistances with resistance R 3, is used to prevent that the order wire short circuit from burning out the serial ports transceiver; Resistance R 4, jumper wire device X5 are that a terminal build-out resistor is selected circuit, are used for the signal transmssion line coupling, prevent signal reflex.
Compared with present technology, the utility model beneficial effect is embodied in:
The time-sharing multiplex keyboard reading scan circuit of the utility model comprises governor circuit, keyboard scanning circuit, reading scan circuit and telecommunication circuit.Governor circuit links to each other with keyboard scanning circuit, manages 64 buttons, and realization judgement button is pressed, upspring and the button shake removal function; Governor circuit links to each other with the reading scan circuit, manages 128 LED lights, realizes switch LED light function; Governor circuit links to each other with telecommunication circuit, accomplishes and receives outside display message, sends the button value function.The time-sharing multiplex keyboard reading scan circuit of the utility model possesses the function of managing 64 buttons and 128 LED lights or 16 8 charactrons simultaneously, has that usage is simple, volume is little, cost is low, takies characteristics such as cpu resource is few.
Description of drawings
Fig. 1 is the theory diagram of the time-sharing multiplex keyboard reading scan circuit of the utility model.
Fig. 2 is the structure chart of governor circuit of the time-sharing multiplex keyboard reading scan circuit of the utility model.
Fig. 3 and Fig. 4 are keyboard scanning circuit and the structure chart of reading scan circuit of the time-sharing multiplex keyboard reading scan circuit of the utility model.
Fig. 5 is the structure chart of telecommunication circuit of the time-sharing multiplex keyboard reading scan circuit of the utility model.
Below pass through embodiment, and combine accompanying drawing that the utility model is described further.
Embodiment
Referring to Fig. 1, be used for the time-sharing multiplex keyboard reading scan circuit of fire alarm control unit, comprise governor circuit, keyboard scanning circuit, reading scan circuit and telecommunication circuit; Said keyboard scanning circuit, reading scan circuit and telecommunication circuit all are connected with said governor circuit;
Keyboard scanning circuit is used to obtain the keyboard signal of pressing and upspring, and sends the signal that obtains to governor circuit;
The reading scan circuit is used to obtain the control signal of governor circuit, and according to the switch of this control signal control LED light;
Telecommunication circuit is used for communicating by letter between governor circuit and the host computer, receives the outside display message that host computer sends, and detected button value is sent to host computer;
Governor circuit is used to receive the signal that keyboard scanning circuit, reading scan circuit and telecommunication circuit are sent, and the control signal that produces is sent to keyboard scanning circuit, reading scan circuit and telecommunication circuit.
Like Fig. 2, said governor circuit comprises single-chip microcomputer D1, resistance R 5～R12, resistance R 18, capacitor C 7, capacitor C 8, capacitor C 10, crystal G1 and address wire jumper X3; Said capacitor C 7, capacitor C 8 and crystal G1 form a clock oscillation circuit, and D1 provides clock signal for single-chip microcomputer; Resistance R 18 is formed an electrify restoration circuit with capacitor C 10, for single-chip microcomputer provides reset signal; Address wire jumper X3 is used to dispose the mailing address of governor circuit; Resistance R 5～R12 constitutes a pull-up circuit, is used to strengthen the P0 mouth driving force of single-chip microcomputer D1; Single-chip microcomputer D1 realizes the function of supervisory keyboard matrix and LED matrix through P0 mouth, P1 mouth, P2 mouth supervisory keyboard scanning circuit and reading scan circuit.
Like Fig. 3 and Fig. 4, said keyboard scanning circuit comprises resistance R 16～R23, resistance R 43～R50, diode V128～V135, bus driver D3, bus driver D4 and keyboard matrix S0～S63; Bus driver D3, D4 and reading scan circuit are shared.Resistance R 16～R23 is a pull down resistor, is used to confirm not when being pressed, and what single-chip microcomputer D1 read through the P0 mouth all is low level; Resistance R 16～R23 also forms a bleeder circuit with resistance R 43～R50, and its voltage ratio guarantees that when having key to be pressed what single-chip microcomputer D1 read is high level; Diode V128～V135 forms an anti-button short circuit current, when two keys of same row are pressed simultaneously, prevents the horizontal scanning line short circuit that it is corresponding; Bus driver D3 time-sharing work is under two states: input and output, and the switching of its working method is controlled by single-chip microcomputer D1; In the keyboard scan period, bus driver D3 works in input state, and single-chip microcomputer D1 is through the line scan signals of bus driver D4 output key, and D3 reads key-press status through bus driver; 64 button S0～S63 are arranged in 8 buttons of every row, and one has 8 row, constitutes one 8 * 8 keyboard matrix.
Like Fig. 3 and Fig. 4, said reading scan circuit comprises resistance R 27～R42, bus driver D3, bus driver D4, bus driver D5 and LED matrix; Wherein bus driver D3, D4 and keyboard scanning circuit are shared.Resistance R 27～R42 is 16 current-limiting resistances, and the electric current when being used to limit LED and lighting prevents that bus driver is because of the excessive damage of electric current; Bus driver D3 works in output state in the reading scan period, and the B0 of bus driver D3～B7 pin is exported high level successively, circulates 2 times; Bus driver D4 and bus driver D5 be the output information sign indicating number successively, and during bus driver D4 output information sign indicating number, bus driver D5 output is high level entirely, and bus driver D5 is the output information sign indicating number successively, and bus driver D4 output is high level entirely; 128 LED lights are arranged in 8 LED lights of every row, and one has 16 row, constitutes one 16 * 8 LED matrix.
Like Fig. 5, said telecommunication circuit comprises resistance R 1～R4, serial ports transceiver D2, connector X1, jumper wire device X5; Serial ports transceiver D2 is used for the transmitting-receiving of serial data and the conversion of data level; Resistance R 1 is a pull-up resistor, serial ports transceiver D2 /when holding level with both hands, RE is in low level state, and make serial ports transceiver D2 be operated in accepting state; When needs send data, serial ports transceiver D2 /the RE end will transfer high level state to, and pull-up resistor R1 can provide and draw drive current, quickens the switching of serial ports transceiver operating state; Resistance R 2 is two current-limiting resistances with resistance R 3, is used to prevent that the order wire short circuit from burning out the serial ports transceiver; Resistance R 4, jumper wire device X5 are that a terminal build-out resistor is selected circuit, are used for the signal transmssion line coupling, prevent signal reflex.
The workflow of the time-sharing multiplex keyboard reading scan circuit of the utility model is: governor circuit is communicated by letter with host computer through telecommunication circuit, the key assignments of codan lamp state information, transmission button.The governor circuit timesharing takes turns access key sweeping scanning circuit and reading scan circuit, and the partial circuit in keyboard scanning circuit and the reading scan circuit is multiplexing, and in the visit keyboard scanning circuit stage, it belongs to keyboard scanning circuit; In the visit reading scan circuit stage, it belongs to the reading scan circuit.
The keyboard matrix scanning process is: governor circuit at first supervisory keyboard scanning circuit is operated in input state; Through 8 horizontal scanning lines of reading scan circuit output keyboard matrix is high level entirely; Governor circuit reads 8 column scan lines of keyboard matrix, as being low level entirely, representes that no button is pressed; If any high level, then a button is pressed in expression.If any high level, only a button is pressed in expression, specifically is that which key is not also known, need carry out the next round scanning work this moment.Governor circuit supervisory keyboard row matrix scan line has only a line output high level at every turn, 8 horizontal scanning line outputs in turn, and high level of every output, governor circuit just read 8 column scan lines of primary key dish matrix, thereby judge the item of the button that is pressed.
LED matrix-scanning process is: governor circuit at first supervisory keyboard scanning circuit is operated in output state; Through keyboard scanning circuit output LED matrix column scan line; Has only a row output high level at every turn; Governor circuit is lighted corresponding LED light through the corresponding information code (8) of these row of reading scan circuit output.Article 8, column scan line output in turn circulates 2 times, thereby accomplishes refreshing 128 LED lights.
Though the utility model explains hereinbefore according to preferred embodiment that this does not represent that the scope of the utility model is confined to above-mentioned structure, as long as the structure that is required to be covered by this utility model right is all within protection range.The technical staff in present technique field can be developed the equivalent substitution structure that at an easy rate after reading above-mentioned explanation, in following equalization variation and the modification of being done of spirit that does not break away from the utility model and scope, all should be covered by within the utility model protection range.
Claims (5)
1. be used for the time-sharing multiplex keyboard reading scan circuit of fire alarm control unit, it is characterized in that, comprise governor circuit, keyboard scanning circuit, reading scan circuit and telecommunication circuit; Said keyboard scanning circuit, reading scan circuit and telecommunication circuit all are connected with said governor circuit;
Keyboard scanning circuit is used to obtain the keyboard signal of pressing and upspring, and sends the signal that obtains to governor circuit;
The reading scan circuit is used to obtain the control signal of governor circuit, and according to the switch of this control signal control LED light;
Telecommunication circuit is used for communicating by letter between governor circuit and the host computer, receives the outside display message that host computer sends, and detected button value is sent to host computer;
Governor circuit is used to receive the signal that keyboard scanning circuit, reading scan circuit and telecommunication circuit are sent, and the control signal that produces is sent to keyboard scanning circuit, reading scan circuit and telecommunication circuit.
2. time-sharing multiplex keyboard reading scan circuit according to claim 1 is characterized in that said governor circuit comprises single-chip microcomputer D1, resistance R 5～R12, resistance R 18, capacitor C 7, capacitor C 8, capacitor C 10, crystal G1 and address wire jumper X3; Said capacitor C 7, capacitor C 8 and crystal G1 form a clock oscillation circuit, and D1 provides clock signal for single-chip microcomputer; Resistance R 18 is formed an electrify restoration circuit with capacitor C 10, for single-chip microcomputer provides reset signal; Address wire jumper X3 is used to dispose the mailing address of governor circuit; Resistance R 5～R12 constitutes a pull-up circuit, is used to strengthen the P0 mouth driving force of single-chip microcomputer D1; Single-chip microcomputer D1 realizes the function of supervisory keyboard matrix and LED matrix through P0 mouth, P1 mouth, P2 mouth supervisory keyboard scanning circuit and reading scan circuit.
3. time-sharing multiplex keyboard reading scan circuit according to claim 1; It is characterized in that said keyboard scanning circuit comprises resistance R 16～R23, resistance R 43～R50, diode V128～V135, bus driver D3, bus driver D4 and keyboard matrix S0～S63; Resistance R 16～R23 is a pull down resistor, is used to confirm not when being pressed, and what single-chip microcomputer D1 read through the P0 mouth all is low level; Resistance R 16～R23 also forms a bleeder circuit with resistance R 43～R50, and its voltage ratio guarantees that when having key to be pressed what single-chip microcomputer D1 read is high level; Diode V128～V135 forms an anti-button short circuit current, when two keys of same row are pressed simultaneously, prevents the horizontal scanning line short circuit that it is corresponding; Bus driver D3 time-sharing work is under two states: input and output, and the switching of its working method is controlled by single-chip microcomputer D1; In the keyboard scan period, bus driver D3 works in input state, and single-chip microcomputer D1 is through the line scan signals of bus driver D4 output key, and D3 reads key-press status through bus driver; 64 button S0～S63 are arranged in 8 buttons of every row, and one has 8 row, constitutes one 8 * 8 keyboard matrix.
4. time-sharing multiplex keyboard reading scan circuit according to claim 1 is characterized in that said reading scan circuit comprises resistance R 27～R42, bus driver D3, bus driver D4, bus driver D5 and LED matrix; Resistance R 27～R42 is 16 current-limiting resistances, and the electric current when being used to limit LED and lighting prevents that bus driver is because of the excessive damage of electric current; Bus driver D3 works in output state in the reading scan period, and the B0 of bus driver D3～B7 pin is exported high level successively, circulates 2 times; Bus driver D4 and bus driver D5 be the output information sign indicating number successively, and during bus driver D4 output information sign indicating number, bus driver D5 output is high level entirely, and bus driver D5 is the output information sign indicating number successively, and bus driver D4 output is high level entirely; 128 LED lights are arranged in 8 LED lights of every row, and one has 16 row, constitutes one 16 * 8 LED matrix.
5. time-sharing multiplex keyboard reading scan circuit according to claim 1 is characterized in that said telecommunication circuit comprises resistance R 1～R4, serial ports transceiver D2, connector X1, jumper wire device X5; Serial ports transceiver D2 is used for the transmitting-receiving of serial data and the conversion of data level; Resistance R 1 is a pull-up resistor, serial ports transceiver D2 /when holding level with both hands, RE is in low level state, and make serial ports transceiver D2 be operated in accepting state; When needs send data, serial ports transceiver D2 /the RE end will transfer high level state to, and pull-up resistor R1 can provide and draw drive current, quickens the switching of serial ports transceiver operating state; Resistance R 2 is two current-limiting resistances with resistance R 3, is used to prevent that the order wire short circuit from burning out the serial ports transceiver; Resistance R 4, jumper wire device X5 are that a terminal build-out resistor is selected circuit, are used for the signal transmssion line coupling, prevent signal reflex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205265250U CN202424693U (en) | 2011-12-15 | 2011-12-15 | Display scanning circuit of time sharing multiplex keyboard for fire alarm controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205265250U CN202424693U (en) | 2011-12-15 | 2011-12-15 | Display scanning circuit of time sharing multiplex keyboard for fire alarm controller |
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| Publication Number | Publication Date |
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| CN202424693U true CN202424693U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205265250U Withdrawn - After Issue CN202424693U (en) | 2011-12-15 | 2011-12-15 | Display scanning circuit of time sharing multiplex keyboard for fire alarm controller |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523003A (en) * | 2011-12-15 | 2012-06-27 | 蚌埠依爱消防电子有限责任公司 | Time-sharing multiplexing keyboard display scanning circuit applied to fire alarm controller |
| CN103015123A (en) * | 2012-12-27 | 2013-04-03 | 合肥荣事达三洋电器股份有限公司 | Method for judging functions of washing machine by utilizing LED (light emitting diode) scanning circuit |
| CN110084990A (en) * | 2019-05-09 | 2019-08-02 | 蚌埠依爱消防电子有限责任公司 | A kind of 2 line fire display panel fire alarm information display methods |
-
2011
- 2011-12-15 CN CN2011205265250U patent/CN202424693U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523003A (en) * | 2011-12-15 | 2012-06-27 | 蚌埠依爱消防电子有限责任公司 | Time-sharing multiplexing keyboard display scanning circuit applied to fire alarm controller |
| CN102523003B (en) * | 2011-12-15 | 2014-06-18 | 蚌埠依爱消防电子有限责任公司 | Time-sharing multiplexing keyboard display scanning circuit applied to fire alarm controller |
| CN103015123A (en) * | 2012-12-27 | 2013-04-03 | 合肥荣事达三洋电器股份有限公司 | Method for judging functions of washing machine by utilizing LED (light emitting diode) scanning circuit |
| CN110084990A (en) * | 2019-05-09 | 2019-08-02 | 蚌埠依爱消防电子有限责任公司 | A kind of 2 line fire display panel fire alarm information display methods |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120905 Effective date of abandoning: 20140618 |
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| RGAV | Abandon patent right to avoid regrant |