CN101625670A - Serial bus device, serial bus transmission system and method - Google Patents
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Abstract
The invention relates to a serial bus device, a serial bus transmission system and a method. The serial bus device comprises an address distributing device which comprises a dial switch and a confirmation switch. The serial bus transmission system comprises a primary device and a secondary device connected on the serial bus, wherein the secondary device comprises an address distributing device which comprises a dial switch and a conformation switch. The serial bus transmission method comprises the following steps: S1, different address codes are set by setting the status of the dial switch; S2, the address code is stored into a memory of the secondary device; and S3, the primary device communicates with the secondary device by using the address code stored in the memory. In the invention, the address code is set through the dial switch and stored into the memory so that the system operates normally even if both the dial switch and the confirmation switch are damaged, thereby ensuring high reliability and reducing the cost.
Description
Technical field
The present invention relates to the universal serial bus technology in the communications field, more particularly, relate to a kind of serial bus equipment, serial bus transmission system and method.
Background technology
Equipment in the serial bus transmission system is divided into main equipment and slave unit.When a serial bus system had a plurality of slave unit that has a serial bus interface, every slave unit all will have an address code different with other slave unit, could guarantee normally carrying out of communication like this.At present, in serial bus transmission system, the address setting mode of slave unit mainly contains two kinds, and a kind of is by the software setting address code, and another kind is by plucking number sign switch address code to be set.But all there is following shortcoming in above-mentioned two kinds of set-up modes:
1, by the software setting address code: the address code of slave unit is stored in the storage chip, this method is very reliable, but generally need go to finish the setting of each slave unit address code with the specific software of computer operation, for being set, address code needs to connect power lead and order wire at least, and set the address code that can be difficult to distinguish which platform slave unit after the address code of slave unit what be, very inconvenient when Installation and Debugging;
2, by the plucking number sign switch device address code: need with one group of plucking number sign switch, form different address codes by plucking number sign switch being pulled out different positions, but plucking number sign switch is a kind of mechanical type toggle switch, service time of a specified duration shell fragment in the plucking number sign switch can lose elastic force or get rusty and easily cause pulling out the mistake of yard address code, reliability is low.
Summary of the invention
The technical problem to be solved in the present invention is that the above-mentioned defective at prior art provides a kind of serial bus equipment, serial bus transmission system and method.
One of the technical solution adopted for the present invention to solve the technical problems is: constructs a kind of serial bus equipment, comprises the serial bus interface, controller and the storer that are electrically connected successively, also comprise the address distributing device that is electrically connected with described controller,
Described address distributing device comprises toggle switch and confirms switch;
By the state that described toggle switch is set different address codes is set;
By starting the described controller of described affirmation switch triggering described address code is kept in the described storer;
Carry out matching addresses and set up communication by the described address code that use is stored in the described storer.
In the serial bus equipment of the present invention, described toggle switch comprises at least one group of selector switch that can establish reset or " 1 " two states.
In the serial bus equipment of the present invention, described serial bus interface is the RS485 interface; Perhaps, described serial bus interface is a USB interface.
Two of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of serial bus transmission system, comprise the main equipment and the slave unit that are connected on the universal serial bus, described slave unit comprises serial bus interface, controller and the storer that is electrically connected successively, described slave unit also comprises the address distributing device that is electrically connected with described controller
Described address distributing device comprises toggle switch and confirms switch;
By the state that described toggle switch is set different address codes is set;
By starting the described controller of described affirmation switch triggering described address code is kept in the described storer;
Communication is discerned and set up to described main equipment according to the described address code of storing in the described storer to described slave unit.
In the serial bus transmission system of the present invention, described toggle switch comprises at least one group of selector switch that can establish reset or " 1 " two states.
In the serial bus transmission system of the present invention, described universal serial bus is the RS485 bus, and described serial bus interface is the RS485 interface; Perhaps, described universal serial bus is a usb bus, and described serial bus interface is a USB interface.
Three of the technical solution adopted for the present invention to solve the technical problems is: constructs a kind of universal serial bus transmission method, may further comprise the steps,
S1: different address codes is set by the state that toggle switch is set;
S2: described address code is stored in the storer of slave unit;
S3: main equipment is set up with described slave unit according to the described address code of storing in the described storer and is communicated by letter.
In the universal serial bus transmission method of the present invention, in described step S2, produce a pulse when starting the affirmation switch of described slave unit, the controller of described slave unit receives described pulse and detect to connect level state on the I/O of described toggle switch, and this level state is stored in the storer of described slave unit as the address code of described slave unit.
In the universal serial bus transmission method of the present invention, described toggle switch comprises at least one group of selector switch that can establish reset or " 1 " two states.
In the universal serial bus transmission method of the present invention, described universal serial bus is the RS485 bus, and perhaps, described universal serial bus is a usb bus.
Implement technical scheme of the present invention, have following beneficial effect:
1, main equipment communicates with slave unit by address stored sign indicating number in the storer that uses slave unit, set the address code of slave unit after, even plucking number sign switch and affirmation switch all damage the operate as normal that does not also influence system, the reliability height;
2, can consider the life-span of plucking number sign switch, select the lower plucking number sign switch of price for use, to reduce cost;
3, can read the address code of each slave unit by the state of toggle switch, when Installation and Debugging, be easy to distinguish.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the system applies block diagram of serial bus equipment of the present invention;
Fig. 2 is the internal frame diagram of serial bus equipment of the present invention;
Fig. 3 is the block diagram of serial bus transmission system of the present invention;
Fig. 4 is the block diagram of first embodiment of the invention RS485 bus transfer system;
Fig. 5 is the block diagram of second embodiment of the invention usb bus transmission system;
Fig. 6 is the process flow diagram of universal serial bus transmission method of the present invention.
Embodiment
As shown in Figure 1, be the system applies block diagram of serial bus equipment of the present invention.On universal serial bus, be connected with a main equipment and a plurality of slave unit, as slave unit 1, slave unit 2, slave unit 3...... slave unit N-1, slave unit N.Wherein, each slave unit is provided with serial bus interface, controller and the storer that intercoms mutually with universal serial bus as serial bus equipment, also is provided with toggle switch simultaneously and confirms switch.The address code of slave unit is set by the state that toggle switch is set, confirm that by starting the switch triggering controller is kept at address code in the storer of slave unit, carry out matching addresses by the address code that use is stored in the storer, thereby the realization main equipment is communicated by letter with identification and foundation between the slave unit.
As shown in Figure 2, be the internal frame diagram of serial bus equipment of the present invention.Serial bus equipment of the present invention comprises serial bus interface, controller and the storer that is electrically connected successively, also comprises the address distributing device that is electrically connected with controller.Address distributing device comprises toggle switch 1 and confirms switch 2, by the state that toggle switch 1 is set different address codes is set, confirm that by starting switch 2 triggers the address code that controller reads toggle switch, and the address code that is read is kept in the storer, carry out matching addresses and set up communication by the address code that use is stored in the storer.
Wherein, toggle switch 1 comprises at least one group of selector switch that can establish reset or " 1 " two states.Serial bus interface is the RS485 interface; Perhaps, serial bus interface is a USB interface.
As shown in Figure 3, be the block diagram of serial bus transmission system of the present invention.Serial bus transmission system of the present invention comprises the main equipment and the slave unit that are connected on the universal serial bus, and slave unit comprises serial bus interface, controller and the storer that is electrically connected successively, and slave unit also comprises the address distributing device that is electrically connected with controller.Address distributing device comprises toggle switch 1 and confirms switch 2; By the state that toggle switch 1 is set different address codes is set; Confirm that by starting switch 2 triggers controller address code is kept in the storer; Main equipment discerns and sets up communication according to address stored sign indicating number in the use storer to slave unit.Generally speaking, main equipment is PC or single-chip microcomputer, and the storer of slave unit is selected programmable read only memory or flash memory for use.
When the slave unit address is set, arrive different positions, obtain the address code of various combination by each selector switch of stirring plucking number sign switch 1.For example, be connected with 4 slave units on the universal serial bus, the toggle switch 1 that is provided with on each slave unit comprises 2 groups at least and can be provided with that respectively the selector switch of " 0 " or " 1 " two states just can be enough so, and every group selection switch all is connected on the I/O of slave unit controller.Set gradually 4 toggle switchs 1 on the slave unit: the plucking number sign switch 1 of slave unit 1 is set to " 00 ", the plucking number sign switch 1 of slave unit 2 is set to " 01 ", the plucking number sign switch 1 of slave unit 3 is set to " 10 ", the plucking number sign switch 1 of slave unit 4 is set to " 11 ", starts the affirmation switch 2 on the slave unit then respectively.When starting affirmation switch 2, produce a pulse, when the slave unit controller receives this pulse, begin to detect the level state on the I/O that connects toggle switch, promptly as the address code of this slave unit, the control of slave unit controller is stored in this address code in the storer of slave unit this level state.By that analogy, the address code that is combined to form respectively of the plucking number sign switch 1 of 4 slave units all is stored in the storer of slave unit, promptly, the address code of slave unit 1 is " 00 ", the address code of slave unit 2 is " 01 ", and the address code of slave unit 3 is " 10 ", and the address code of slave unit 4 is " 11 ".Main equipment uses this address code and slave unit to communicate.For example, main equipment is the data message of " 11 " by the destination address that universal serial bus sends set form, at this moment, the data message of all slave units on detection that does not stop and parsing universal serial bus, when slave unit 4 detects address information that the data message that transmitted comprises and self address and matches, then obtain this data message, and carry out the related command operation.
This shows that main equipment communicates with slave unit by address stored sign indicating number in the storer that uses slave unit, set the address code of slave unit after, even plucking number sign switch 1 and affirmation switch 2 all damage the operate as normal that does not also influence system, the reliability height.Wherein, affirmation switch 2 can be selected button for use.
As shown in Figure 4, the block diagram of first embodiment of the invention RS485 bus transfer system.In the present embodiment, universal serial bus is the RS485 bus, and the serial bus interface of slave unit is the RS485 interface.The RS485 bus is a communication protocol with the RS485 standard, can connect 32 slave units at most.
For example, connect 32 slave units on the RS485 universal serial bus, the toggle switch 1 that is provided with on each slave unit comprises 5 groups at least and can be provided with that the selector switch of " 0 " or " 1 " two states just can be enough respectively so.32 toggle switchs 1 on the slave unit are set respectively, and can only have unique, with the toggle switch 1 unduplicated on off state of other slave unit.Set gradually 32 toggle switchs 1 on the slave unit: the plucking number sign switch 1 of slave unit 1 is set to " 00000 ", the plucking number sign switch 1 of slave unit 2 is set to " 00001 ", the plucking number sign switch 1 of slave unit 3 is set to " 00010 ", the plucking number sign switch 1 of slave unit 4 is set to " 00011 ", the plucking number sign switch 1 of slave unit 5 is set to " 00100 " .... the plucking number sign switch 1 of slave unit 32 is set to " 11111 ", starts the affirmation switch 2 on the slave unit then respectively.
When starting affirmation switch 2, produce a pulse, when the slave unit controller receives this pulse, begin to detect the level state on the I/O that connects toggle switch 1, promptly as the address code of this slave unit, the control of slave unit controller is stored in this address code in the storer of slave unit this level state.By that analogy, the address code that the plucking number sign switch of 32 slave units is combined to form respectively all is stored in the storer of each slave unit, promptly, the address code of slave unit 1 is " 00000 ", the address code of slave unit 2 is " 00001 ", the address code of slave unit 3 is " 00010 ", and the address code of slave unit 4 is " 00011 " ... the address code of slave unit 32 is " 11111 ".Main equipment discerns and sets up communication according to this address code to slave unit.For example, main equipment be " 00011 a data message; at this moment; all slave units are in the detection that does not stop and resolve data message on the RS485 bus; when slave unit 4 detects address information that the data message that transmitted comprises and self address and matches; then obtain this data message; and carry out related command and operate by the destination address that the RS485 bus sends set form, by that analogy, the data message of slave unit on detection that does not stop and parsing RS485 bus, when the address information that the data message that transmits up to detecting comprises and self address match, then obtain this data message, and carry out the related command operation, promptly realized communicating by letter between main equipment and the slave unit.In this case, after configuring the address code of slave unit,, also can not have influence on the operate as normal of system, the reliability height even toggle switch of slave unit 1 and affirmation switch 2 have all damaged; When building system, can consider the life-span of plucking number sign switch, select the lower plucking number sign switch of price for use, to reduce cost.In addition, can read the address code of each slave unit, when Installation and Debugging, be easy to distinguish by toggle switch 1 state.In the present embodiment, affirmation switch 2 is selected button for use.
As shown in Figure 5, the block diagram of second embodiment of the invention usb bus transmission system.In the present embodiment, universal serial bus is a usb bus, and the serial bus interface of slave unit is a USB interface.Its embodiment is identical with the address distribution of first embodiment, and different is, universal serial bus is a usb bus, is communication protocol with the usb protocol between main equipment and the slave unit, can connect 127 slave units that have USB interface on the usb bus at most.
At present, mainly with computing machine as main equipment, computing machine generally has only two USB port, if want to connect more slave unit by USB interface, then can utilize usb hub, this hub can provide a plurality of USB port, only needs that this hub is directly inserted main equipment and gets final product.
In the present embodiment, the usb bus transmission system is identical with the embodiment of RS485 bus transfer system, unique different be that the usb bus transmission system can connect 127 slave units at most, accordingly, toggle switch 1 needs to select for use according to the quantity of slave unit the group number of the selector switch that can establish reset or " 1 " two states, as connecting 127 slave units, the toggle switch 1 that then need select for use includes 8 groups at least can be provided with the selector switch of " 0 " or " 1 " two states respectively respectively.
Serial bus transmission system of the present invention is applicable to the transmission of other serial bus protocol, as the I2C bus etc.
As shown in Figure 6, be the process flow diagram of universal serial bus transmission method of the present invention.Universal serial bus transmission method of the present invention may further comprise the steps:
Step S0: beginning;
Step S1: different address codes is set by the state that toggle switch is set;
Step S2: address code is stored in the storer of slave unit;
Step S3: main equipment is set up with slave unit by address stored sign indicating number in the use storer and is communicated by letter;
Step S4 finishes.
In step S2, after being provided with of completing steps S1, produce a pulse when starting the affirmation switch of slave unit, the controller of slave unit receives this pulse and detects level state on the I/O that connects toggle switch, and this level state is stored in the storer of slave unit as the address code of slave unit.
In step S3, data message on detection that slave unit does not stop and the parsing universal serial bus, when the address information that the data message that transmits up to detecting comprises and self address match, obtain this data message, and carry out the related command operation, promptly realized communicating by letter between main equipment and the slave unit.
Among the present invention, universal serial bus can be the RS485 bus, also can be other universal serial bus such as usb bus.Toggle switch comprises at least one group of switch that can establish reset or " 1 " two states, can carry out the best according to the number of selected universal serial bus type and slave unit and select for use.
The above only is embodiments of the invention, not in order to restriction the present invention, all any modifications of being done in the spirit and principles in the present invention, is equal to and replaces or improvement etc., all should be included in protection scope of the present invention.
Claims (10)
1, a kind of serial bus equipment comprises the serial bus interface, controller and the storer that are electrically connected successively, it is characterized in that, also comprises the address distributing device that is electrically connected with described controller,
Described address distributing device comprises toggle switch and confirms switch;
By the state that described toggle switch is set different address codes is set;
By starting the described controller of described affirmation switch triggering described address code is kept in the described storer;
Carry out matching addresses and set up communication by the described address code that use is stored in the described storer.
2, serial bus equipment according to claim 1 is characterized in that, described toggle switch comprises at least one group of selector switch that can establish reset or " 1 " two states.
3, serial bus equipment according to claim 1 is characterized in that, described serial bus interface is the RS485 interface; Perhaps, described serial bus interface is a USB interface.
4, a kind of serial bus transmission system, comprise the main equipment and the slave unit that are connected on the universal serial bus, described slave unit comprises serial bus interface, controller and the storer that is electrically connected successively, it is characterized in that, described slave unit also comprises the address distributing device that is electrically connected with described controller
Described address distributing device comprises toggle switch and confirms switch;
By the state that described toggle switch is set different address codes is set;
By starting the described controller of described affirmation switch triggering described address code is kept in the described storer;
Communication is discerned and set up to described main equipment according to the described address code of storing in the described storer to described slave unit.
5, serial bus transmission system according to claim 4 is characterized in that, described toggle switch comprises at least one group of selector switch that can establish reset or " 1 " two states.
6, serial bus transmission system according to claim 4 is characterized in that, described universal serial bus is the RS485 bus, and described serial bus interface is the RS485 interface; Perhaps, described universal serial bus is a usb bus, and described serial bus interface is a USB interface.
7, a kind of universal serial bus transmission method is characterized in that, may further comprise the steps,
S1: different address codes is set by the state that toggle switch is set;
S2: described address code is stored in the storer of slave unit;
S3: main equipment is set up with described slave unit according to the described address code of storing in the described storer and is communicated by letter.
8, universal serial bus transmission method according to claim 7, it is characterized in that, in described step S2, produce a pulse when starting the affirmation switch of described slave unit, the controller of described slave unit receives described pulse and detect to connect level state on the I/O of described toggle switch, and this level state is stored in the storer of described slave unit as the described address code of described slave unit.
9, universal serial bus transmission method according to claim 7 is characterized in that, described toggle switch comprises at least one group of selector switch that can establish reset or " 1 " two states.
10, serial bus transmission system according to claim 7 is characterized in that, described universal serial bus is the RS485 bus, and perhaps, described universal serial bus is a usb bus.
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Application publication date: 20100113 |