CN106559299A - Serial communication device, serial communication system and serial communication method - Google Patents
Serial communication device, serial communication system and serial communication method Download PDFInfo
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Abstract
Disclose serial communication device, serial communication system and serial communication method.The serial communication device includes：Input block, output unit, memory cell, gating unit and control unit, the serial communication device has the first mode for receiving data, for forwarding the second mode and the 3rd pattern for sending data of data, control unit is for the switching between the first to the 3rd pattern, wherein, in the first mode, input block is connected to memory cell by gating unit, in the second mode, input block is connected to output unit by gating unit, the data of reception are directly exported, in the 3rd pattern, data in memory cell are exported by output unit.In the serial communication system of the serial communication device including cascade, it is possible to reduce signal is sent to the time of rear class serial communication device, so as to improve communication efficiency and performance.
Description
Technical field
The present invention relates to communication technical field, and in particular to a kind of serial communication device, serial communication
System and serial communication method.
Background technology
Serial communication, is that data are divided into binary digit (bit) one by one, then host side and
Slave devices realize leading between host side and slave devices using a circuit or a communication channel
Letter (data exchange).Serial communication as it is a kind of flexibly, convenient, the reliable communication technology, because of which
With take hardware resource it is few, can be greatly lowered the cost of communication line, simplify communication equipment,
Many advantages, such as using flexible, easy care, lead in Industry Control, power communication, intelligence instrument etc.
Domain is widely applied.
Communication requirement communicating pair observes identical agreement, so that both sides complete data
Transmitting-receiving.In general, serial communication mode can only once realize the point-to-point biography between two equipment
Defeated, if desired multiple slave devices and host side are communicated, then need the equipment of host side successively
Connect to realize with slave devices, the Chinese invention patent of such as Patent No. CN101140553A,
By different addresses being configured to slave devices, need to specify recipient when host side sends data every time
Address, slave devices when find address value it is equal when just respond.Or, make slave devices
Also there is in addition to the function of receiving data the ability of forwarding data, host side is realized to multiple with this
Slave devices send the function of data.
The serial communication system of prior art as shown in Figure 1 includes the slave of host side 10 and cascade
Equipment, the slave devices of its cascade include slave devices 201 to slave devices 20n.Slave sets
Standby structure as shown in Fig. 2 including：Input block 21, output unit 22, buffer unit 23,
Memory cell 24 and control unit 25.Input block 21 is received from host side or upper level
The serial communication data that slave devices send, and it is stored in buffer unit 23.Jing control units 25 are sentenced
It is disconnected, if belonging to the data of this slave devices, memory cell 24 is stored in, if not this slave devices number
According to then exporting to next stage slave devices via output unit 22.With above-mentioned serial communication system
As a example by, it is assumed that each slave devices needs to receive data of the length for m, then, host side sends
Data length should be m*n；As each slave devices is required for caching to the data for receiving,
Assume length the taking as T of (or storage) is cached and retransmited after being judged for the data of m.
Assume that the data needed for first order slave devices 201 are the data that host side is sent at first, when first
After level slave devices 201 receive length for the data of m, its control unit detection is found to be this equipment
Required data, then storage now take T to memory cell, and first order slave devices continue to connect
Data of the length for m are received, non-native desired data is found, is then forwarded, then time-consuming T；Now,
Second level slave devices start receiving data, i.e. second level slave devices need to wait for 2*T time it
Just start afterwards to receive and processing data；Judge whether forwarding after must receiving due to slave devices again,
The time delay for causing T is wasted.As every one-level slave devices are required for carrying out reception judgement, this prolongs
When waste can gradually transmit and accumulate in slave devices at different levels.
From the above it can be seen that in the serial communication system, as every one-level slave devices need receiving data
And after judging, can just decide whether forwarding, and now next stage slave devices will be in wait, wave
Take the time of T.With the complication of application demand, to the communication efficiency and performance of serial communication
When requiring more and more higher, when such as slave devices number is larger, data are longer, can be to serial communication system
The efficiency of system brings considerable influence.
The content of the invention
In view of this, the present invention proposes a kind of serial communication device, serial communication system and serial
Communication means, sends and passes through gating unit by output unit after serial data is arranged in order
Direct-connected with output unit, slave devices need not first be received and judge whether again forwarding, reduce subordinate
The stand-by period of slave devices, improve the efficiency of serial communication system.
According to the first aspect of the invention, there is provided a kind of serial communication device, including：Input block,
Output unit, memory cell, gating unit and control unit, the serial communication device has to be used
First mode in receiving data, the second mode for forwarding data and for sending data
Three patterns, control unit between the first to the 3rd pattern switch, wherein, described first
Input block is connected to memory cell by pattern, gating unit, and in the second mode, gating is single
Input block is connected to output unit by unit, the data of reception is directly exported, in the 3rd mould
Formula, the data in memory cell are exported by output unit.
Preferably, the gating unit is data distributor.
Preferably, the serial communication device also includes being arranged between gating unit and memory cell
Buffer unit.
According to the second aspect of the invention, there is provided a kind of serial communication system, including：Host side,
For sending serial data, the serial data includes tactic multiple subdatas；And level
Multiple slave devices of connection, for receiving corresponding subdata from host side, wherein, it is the plurality of
Slave devices are respectively serial communication device,
The serial communication device includes：Input block, output unit, memory cell, gating are single
Unit and control unit, the serial communication device has to be used for the first mode of receiving data, is used for
The second mode and the 3rd pattern for sending data of forwarding data, control unit is for first
Switch between the 3rd pattern,
Wherein, in the first mode, input block is connected to memory cell by gating unit,
In the second mode, input block is connected to output unit by gating unit, by what is received
Data are directly exported,
In the 3rd pattern, the data in memory cell are exported by output unit.
Preferably, the gating unit is data distributor.
Preferably, the serial communication device also includes being arranged between gating unit and memory cell
Buffer unit.
Preferably, the slave devices of the first order of the plurality of slave devices receive the serial data
First subdata.
Preferably, the slave devices of the first order of the plurality of slave devices receive the serial data
Last subdata.
Preferably, any one slave devices of the plurality of slave devices, in the son for receiving corresponding stage
First mode is in during data, while the slave devices of prime are in second mode, so as to will be described
The subdata of corresponding stage is sent to described any one slave devices from host side.
Preferably, the system also includes being arranged between final stage slave devices and the host side
Return path.
Preferably, the slave devices of the first order of the plurality of slave devices are returned to host side first
Data.
Preferably, the slave devices of the first order of the plurality of slave devices last to host side
Return data.
Preferably, any one slave devices of the plurality of slave devices, in the son of passback corresponding stage
The 3rd pattern is in during data, while the slave devices of rear class are in second mode, so as to by accordingly
The subdata of level is sent to host side via the return path.
According to the third aspect of the invention we, there is provided a kind of serial communication method, including：Host side is sent out
Send serial data；And multiple slave devices of cascade receive serial data from host side, wherein,
The plurality of slave devices are controlled as switching between the first to the 3rd pattern, in first mode
Receive and data storage, data are forwarded in second mode, send stored number in the 3rd pattern
According to.
Preferably, the plurality of slave devices receive order in serial data successively from prime to rear class
The subdata of arrangement.
Preferably, the plurality of slave devices receive order in serial data successively from rear class to prime
The subdata of arrangement.
Preferably, any one slave devices of the plurality of slave devices, in the son for receiving corresponding stage
First mode is in during data, while the slave devices of prime are in second mode, so as to will be described
The subdata of corresponding stage is sent to described any one slave devices from host side.
Preferably, using return path, the final stage slave devices in the plurality of slave devices are connected
With the host side.
Preferably, the plurality of slave devices return the subdata of corresponding stage successively from prime to rear class.
Preferably, the plurality of slave devices return the subdata of corresponding stage successively from rear class to prime.
Preferably, any one slave devices of the plurality of slave devices, in the son of passback corresponding stage
The 3rd pattern is in during data, while the slave devices of rear class are in second mode, so as to by accordingly
The subdata of level is sent to host side via the return path.
Serial communication system of the invention and serial communication method, by serial data is pressed suitable
The stand-by period reduced from the equipment that connects is sent after sequence arrangement, the efficiency of serial communication system is improve.
Description of the drawings
By description referring to the drawings to the embodiment of the present invention, the present invention above-mentioned and other
Objects, features and advantages will be apparent from, in the accompanying drawings：
Fig. 1 is the schematic block diagram of the serial communication system of prior art；
Fig. 2 is the schematic block diagram of the slave devices of prior art；
Fig. 3 is the schematic block diagram of serial communication system according to a first embodiment of the present invention；
Fig. 4 a and 4b are the schematic diagrams of serial data according to a first embodiment of the present invention；
Fig. 5 is the schematic block diagram of slave devices according to a first embodiment of the present invention；
Fig. 6 a and 6b are the working timing figures of slave devices according to a first embodiment of the present invention；
Fig. 7 is the schematic block diagram of serial communication system according to a second embodiment of the present invention；
And
When Fig. 8 a and 8b are the work of slave devices return data according to a second embodiment of the present invention
Sequence figure.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these
Embodiment.Below to the present invention detailed description in, it is detailed to describe some specific detail portions
Point.The description of part can also understand this completely without these details for a person skilled in the art
Invention.In order to avoid obscure the present invention essence, known method, process, flow process, element and
Circuit is not described in detail.
Additionally, it should be understood by one skilled in the art that accompanying drawing is provided to provided herein
Bright purpose, and accompanying drawing is not necessarily drawn to scale.It will also be appreciated that following
Description in, " circuit " is referred to and is connected by electrical connection or electromagnetism by least one element or electronic circuit
Connect the galvanic circle of composition.When title element or another element of circuit " being connected to " or title element/circuit
When between " being connected to " two nodes, it can be directly couple or be connected to another element or
There may be intermediary element, the connection between element can be physically, in logic or
Its combination.Conversely, when element " being directly coupled to " or " being directly connected to " another element is claimed,
Mean that both do not have intermediary element.
Unless the context clearly requires otherwise, otherwise in entire disclosure and claims " including ",
The similar word such as "comprising" should be construed to the implication for including rather than exclusive or exhaustive implication；
That is, the implication for being " including but not limited to ".In describing the invention, it is to be understood that
, term " first ", " second " etc. be only used for describe purpose, and it is not intended that indicate or
Hint relative importance.Additionally, in describing the invention, unless otherwise stated, " multiple "
It is meant that two or more.
Fig. 3 is the schematic block diagram of serial communication system according to a first embodiment of the present invention,
Fig. 4 a and 4b are the schematic diagrams of serial data according to a first embodiment of the present invention.The string
Row communication system includes the slave devices of host side 30 and n levels, wherein, the slave devices of n levels are pressed
According to the order of connection with host side 30, slave devices 401 are respectively from prime to rear class and are set to slave
Standby 40n.
Host side 30 sends serial communication data to slave devices, and the serial communication data includes sending
Data Data401 to slave devices 401, data Data402 ... for being sent to slave devices 402
It is sent to data Data40n of slave devices 40n.Host side 30 is by serial data (data
Data401～data Data40n) it is ranked into First ray and then is sent by first port successively.
In the present embodiment, as shown in fig. 4 a, in First ray, according to the company with host side
Connect the data that order arranges slave devices at different levels from prime to rear class.It is that first order slave sets first
Standby data Data401, followed by data Data402 of second level slave devices, are finally n-th
Data Data40n of level slave devices.During transmission, host side 30 sends data Data401 first,
Then Data402 is sent, data Data40n are finally sent.
In preferred embodiment, as shown in Figure 4 b, in First ray, according to host side
The order of connection arranges the data of slave devices at different levels from rear class to prime.It is n-th grade of slave first
Data Data40n of equipment, followed by data Data40 (n-1) of (n-1)th grade of slave devices, most
It is data Data401 of first order slave devices afterwards.During transmission, data Data40n are sent first,
Then Data40 (n-1) is sent, data Data401 are finally sent.
Fig. 5 is the schematic block diagram of slave devices according to a first embodiment of the present invention, should be from
Machine equipment 40 includes：Input block 41, output unit 42, buffer unit 43, memory cell 44,
Control unit 45 and gating unit 46.
Input block 41 receives the serial communication sent from host side or upper level slave devices
Data, and it is sent to gating unit 46.
Serial communication data is sent to output under the control of control unit 45 by gating unit 46
Unit 42 or buffer unit 43.Preferably, gating unit 46 is data distributor
(demultiplexer)。
Slave devices under the control of control unit 45 reception pattern P1 and direct mode operation P2 it
Between switch.In reception pattern P1, gating unit 46 sends the data to buffer unit 43 and then deposits
Store up in memory cell 44；When control unit 45 judges that the data receiver for belonging to this slave devices is complete
Gating unit 46 is connected to output unit 42 by Bi Hou, control unit 45, and slave devices are switched to
Direct mode operation P2, in direct mode operation P2, the data that input block 41 is received are directly logical without judging
Cross output unit 42 to export.
When the serial data as shown in Fig. 4 a-4b is received, slaves at different levels set the slave devices of cascade
Standby P1 in a receive mode successively, as certain one-level slave devices P1 in a receive mode, thereon
All slave devices of level are in direct mode operation P2.
Fig. 6 a and 6b are the working timing figures of slave devices according to a first embodiment of the present invention.It is false
If the length of data Data401～Data40n is identical, the storage unit stores data in slave devices
Judge that the time that data receiver is finished is T with control unit.
When the serial data of the First ray that host side sends is shown in Fig. 4 a, slave devices at different levels
Working timing figure as shown in Figure 6 a：
In 0～T of time, slave devices 401 are first in reception pattern P1, receiving data Data401,
Take as T, afterwards, i.e., after the T moment, slave devices 401 are in direct mode operation P2.
In time T～2*T, the P1 in a receive mode of slave devices 402, receiving data Data402,
Take as T, afterwards, i.e., after the 2*T moment, slave devices 402 are in direct mode operation P2.
In time 2*T～3*T, the P1 in a receive mode of slave devices 403, receiving data Data403,
Take as T, afterwards, i.e., after the 3*T moment, slave devices 403 are in direct mode operation P2.Together
Reason, the like.
In time (n-1) * T～n*T, slave devices 40n P1 in a receive mode, receiving data
Data403, takes as T.
When the serial data of the First ray that host side sends is shown in Fig. 4 b, slave devices at different levels
Working timing figure as shown in Figure 6 b：
At 0～T of time, 401 to the (n-1)th grades of slave devices of first order slave devices 40 (n-1) place
In direct mode operation P2, n-th grade of slave devices 40n P1, slave devices 40n in a receive mode
Receiving data Data40n, takes as T.
In time T～2*T, 401 to the n-th -2 grades of slave devices of first order slave devices 40 (n-2)
In direct mode operation P2, (n-1)th grade of slave devices 40 (n-1) P1 in a receive mode, slave
Equipment 40 (n-1) receiving data Data40 (n-1), takes as T.
…
In time (n-2) * T～(n-1) * T, first order slave devices 401 are in direct mode operation
P2, slave devices 402 P1, receiving data Data402 in a receive mode, takes as T.
In time (n-1) * T～n*T, the P1 in a receive mode of first order slave devices 401 connects
Data Data401 are received, is taken as T.
Fig. 7 is the schematic block diagram of serial communication system according to a second embodiment of the present invention,
The serial communication system of second embodiment includes the slave devices of host side 30 and n levels, wherein, n
The slave devices of level are respectively slave according to the order of connection with host side 30, from rear class to prime and set
Standby 401 to slave devices 40n, the first port p01 connection slave devices 401 of host side 30
Input block, the output unit of afterbody slave devices 40n connect the second port of host side 30
p02。
Host side 30 can be set to the slave of cascade by first port p01 as in the first embodiment
Preparation send the serial data of sequence, it is also possible to receive returning for each slave devices by second port p02
Pass data.
In this embodiment, slave devices 401 are identical to the structure of slave devices 40n, such as Fig. 5
It is shown.Slave devices include：Input block 41, output unit 42, buffer unit 43, storage
Unit 44, control unit 45 and gating unit 46.Input block 41 is received from host side
Or the serial communication data that upper level slave devices send, and it is sent to gating unit 46.
Serial communication data is sent to output under the control of control unit 45 by gating unit 46
Unit 42 or buffer unit 43.
When host side 30 sends the serial number of sequence by first port p01 to the slave devices of cascade
According to when, slave devices are under the control of control unit 45 in reception pattern P1 and direct mode operation P2
Between switch.In reception pattern P1, then gating unit 46 sends the data to buffer unit 43
Store in memory cell 44；When control unit 45 judges to belong to the data receiver of this slave devices
After finishing, gating unit 46 is connected to output unit 42, slave devices switching by control unit 45
To direct mode operation P2.
When the return data of each slave devices is received by second port p02, slave devices are in control
Switch between upper arq mode P3 and direct mode operation P2 under the control of unit processed 45.Uploading mould
Formula P3, the data in memory cell 44 arrive next stage slave devices by the output of output unit 42,
For afterbody slave devices 40n, the data in memory cell 44 are defeated by output unit 42
Go out second port p02 to host side 30.
The slave devices of cascade are according to order of connection the past to the order of 30 return data of host side
Each slave devices return data successively of level to rear class, alternatively, according to the order of connection from rear class
To each slave devices return data successively of prime.
The work schedule of slave devices return data is described with reference to Fig. 8 a and 8b.Assume respectively from
Machine equipment returns the data of equal length to host side, and is sent out from memory cell by output unit
Send and take as T.
When each slave devices according to the order of connection from prime to rear class return data successively when, such as Fig. 8 a
It is shown,
In 0～T of time, slave devices 401 are first in arq mode P3, its subordinate it is all from
Machine equipment is in direct mode operation P2.
In time T～2*T, slave devices 402 are in upper arq mode P3, all slaves of its subordinate
Equipment is in direct mode operation P2.
In time 2*T～3*T, slave devices 403 are in upper arq mode P3, its subordinate it is all from
Machine equipment is in direct mode operation P2.In the same manner, the like.
In time (n-1) * T～n*T, slave devices 40n is in upper arq mode P3.
When each slave devices according to the order of connection from rear class to prime return data successively when, such as Fig. 8 b
It is shown,
In 0～T of time, slave devices 40n is first in arq mode P3, is switched to afterwards straight-through
Pattern P2.
In time T～2*T, slave devices 40 (n-1) are switched to afterwards in upper arq mode P3
Direct mode operation P2.
In the same manner, the like.
In time (n-1) * T～n*T, slave devices 401 are in upper arq mode P3.
Serial communication system of the invention and serial communication method, by serial data is sorted
The stand-by period reduced from the equipment that connects is sent afterwards, improves the efficiency of serial communication system.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for this
For art personnel, the present invention can have various changes and change.All spirit in the present invention
With any modification, equivalent substitution and improvements made within principle etc., should be included in the present invention's
Within protection domain.
Claims (21)
1. a kind of serial communication device, including：Input block, output unit, memory cell, choosing
Logical unit and control unit, the serial communication device have for receiving data first mode,
For forwarding the second mode and the 3rd pattern for sending data of data, control unit for
Switch between first to the 3rd pattern,
Wherein, in the first mode, input block is connected to memory cell by gating unit,
In the second mode, input block is connected to output unit by gating unit, by what is received
Data are directly exported,
In the 3rd pattern, the data in memory cell are exported by output unit.
2. equipment according to claim 1, wherein, the gating unit is data distributor.
3. equipment according to claim 1, wherein, the serial communication device also includes setting
The buffer unit being placed between gating unit and memory cell.
4. a kind of serial communication system, including：
Host side, for sending serial data, the serial data includes tactic many height
Data；And
Multiple slave devices of cascade, for receiving corresponding subdata from host side,
Wherein, the plurality of slave devices are respectively serial communication device,
The serial communication device includes：Input block, output unit, memory cell, gating are single
Unit and control unit, the serial communication device has to be used for the first mode of receiving data, is used for
The second mode and the 3rd pattern for sending data of forwarding data, control unit is for first
Switch between the 3rd pattern,
Wherein, in the first mode, input block is connected to memory cell by gating unit,
In the second mode, input block is connected to output unit by gating unit, by what is received
Data are directly exported,
In the 3rd pattern, the data in memory cell are exported by output unit.
5. system according to claim 4, wherein, the gating unit is data distributor.
6. system according to claim 4, wherein, the serial communication device also includes setting
The buffer unit being placed between gating unit and memory cell.
7. system according to claim 4, wherein, the first order of the plurality of slave devices
Slave devices receive first subdata of the serial data.
8. system according to claim 4, wherein, the first order of the plurality of slave devices
Slave devices receive last subdata of the serial data.
9. the system according to claim 7 or 8, wherein, the plurality of slave devices are appointed
One slave devices, receive corresponding stage subdata when be in first mode, while prime from
Machine equipment is in second mode, described so as to the subdata of the corresponding stage is sent to from host side
Any one slave devices.
10. system according to claim 4, also including being arranged at final stage slave devices and institute
State the return path between host side.
11. systems according to claim 10, wherein, the first of the plurality of slave devices
The slave devices of level are first to host side return data.
12. systems according to claim 10, wherein, the first of the plurality of slave devices
Level slave devices last to host side return data.
13. systems according to claim 11 or 12, wherein, the plurality of slave devices
Any one slave devices, return corresponding stage subdata when be in the 3rd pattern, while rear class
Slave devices be in second mode, so as to the subdata of corresponding stage is passed via the return path
Deliver to host side.
A kind of 14. serial communication methods, including：
Host side sends serial data；And
Multiple slave devices of cascade receive serial data from host side,
Wherein, the plurality of slave devices are controlled as switching between the first to the 3rd pattern,
Receive and data storage in first mode, data are forwarded in second mode, send in the 3rd pattern
Stored data.
15. methods according to claim 14, wherein, the plurality of slave devices are from prime
Tactic subdata in serial data is received successively to rear class.
16. methods according to claim 14, wherein, the plurality of slave devices are from rear class
Tactic subdata in serial data is received successively to prime.
17. methods according to claim 15 or 16, wherein, the plurality of slave devices
Any one slave devices, receive corresponding stage subdata when be in first mode, while prime
Slave devices be in second mode, so as to the subdata of the corresponding stage is sent to from host side
Described any one slave devices.
18. methods according to claim 14, wherein, using return path, connection is described
Final stage slave devices and the host side in multiple slave devices.
19. methods according to claim 18, wherein, the plurality of slave devices are from prime
Return the subdata of corresponding stage to rear class successively.
20. methods according to claim 18, wherein, the plurality of slave devices are from rear class
Return the subdata of corresponding stage to prime successively.
21. methods according to claim 19 or 20, wherein, the plurality of slave devices
Any one slave devices, return corresponding stage subdata when be in the 3rd pattern, while rear class
Slave devices be in second mode, so as to the subdata of corresponding stage is passed via the return path
Deliver to host side.
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| CN108965448A (en) * | 2018-07-27 | 2018-12-07 | 东莞铭普光磁股份有限公司 | A kind of message transfer system and method |
| CN108965448B (en) * | 2018-07-27 | 2022-09-16 | 东莞铭普光磁股份有限公司 | Information transmission system and method |
| CN111083169A (en) * | 2019-12-31 | 2020-04-28 | 国网新疆电力有限公司电力科学研究院 | Communication method and system for industrial control network |
| CN112118300A (en) * | 2020-09-03 | 2020-12-22 | 深圳市明微电子股份有限公司 | Cascade device data returning method, device and system and readable storage medium |
| CN112118300B (en) * | 2020-09-03 | 2023-06-13 | 深圳市明微电子股份有限公司 | Cascade device data returning method, device and system and readable storage medium |
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