GB2170631A - A serial transmission apparatus - Google Patents
A serial transmission apparatus Download PDFInfo
- Publication number
- GB2170631A GB2170631A GB08602643A GB8602643A GB2170631A GB 2170631 A GB2170631 A GB 2170631A GB 08602643 A GB08602643 A GB 08602643A GB 8602643 A GB8602643 A GB 8602643A GB 2170631 A GB2170631 A GB 2170631A
- Authority
- GB
- United Kingdom
- Prior art keywords
- section
- slave
- signal
- transmission
- master
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Small-Scale Networks (AREA)
- Information Transfer Systems (AREA)
- Selective Calling Equipment (AREA)
- Communication Control (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Abstract
A serial transmission apparatus in which a master section supervises and controls a plurality of slave sections through a serial transmission line, wherein an information transmission line for transmitting an information indicating a change in the state of the slave section through upper stage slave sections is provided between two slave sections located adjacent to each other and between the front slave section and the master section. Thus state changes are signaled without polling. The master section can address a slave section for control purposes. <IMAGE>
Description
SPECIFICATION
A serial transmission apparatus
FIELD OF THE INVENTION
The present invention relates to a serial transmission apparatus for conducting a serial transmission of information between a master section and a plurality of slave sections.
BACKGROUND OF THE INVENTION
Figure 2 shows a block diagram showing a prior art serial transmission apparatus.
In Figure 2, the reference numeral 1 designates a master section, the numerals 2a, 2b, 2c, 2d, ... designate slave sections which are supervised and controlled by the master section 1 through a serial transmission. The numeral 2 designates a slave group compris ing slave sections 2a, 2b, 2c, 2d .... The numeral 3 designates a serial transmission line for connecting between slave sections in the slave group 2 and between the front slave section 2a and the master section 1.
The device will be operated as follows:
In an operation that the master section 1 should control the slave section 2b, the master section 1 sends the address of the slave section 2b and also a control data for controlling the slave section 2b to the serial transmission line 3. The data transmitted through the serial transmission line 3 is received by the slave section 2b, and when the address in the received data coincides with the address of the slave section 2b, the control data is taken in, and a process in accordance with the control data is conducted. In other slave sections the address in the received data does not coincide with the address of itself, and accordingly the received data is ignored.
In an operation that the master section 1 should supervise the state of the slave section 2a, that is, conduct a polling, the master section 1 outputs the address of the slave section 2a and a signal indicating a supervision as a control data, that is, a polling signal to the serial transmission line 3. The slave section 2a receives this polling signal, and transmits serially data to be supervised, such as an information indicating the state of switch or the like of that slave section or an abnormal information to the master section 1 through the serial transmission line 3.
In the prior art serial transmission apparatus under such a construction, it is required that the master section 1 should send a control data to each slave section of the slave group 2 in order to conduct a control in accordance with the control mode, and also it is required that the master section 1 should conduct a polling operation, that is, serially transmits a supervising signal time-sharingly at a predetermined time interval and wait a response thereto in accordance with the supervising mode in order to collect information to be supervised occurring undeterministicly from each slave section without radio interference.
Furthermore, it is necessary to conduct a polling operation even if there is no change in the data to be supervised which is received this time from that which is received previously from each slave section of the slave group 2.
As described above, in the prior art serial transmission apparatus, there was a disadvantage that the burden to the master section becomes large caused by this polling.
SUMMARY OF THE INVENTION
The present invention is directed to solve the problems pointed out above, and has for its object to provide a serial transmission apparatus capable of reducing the burden to the master section to a great extent by deleting the necessity that the master section should conduct a polling periodically.
Other objects and advantages of the present invention will become apparent from the detailed description given hereinafter; it should be understood, however, that the detailed description and specific embodiment are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
According to the present invention, there is provided a serial transmission apparatus in which a master section supervises and controls a plurality of slave sections through a serial transmission line, wherein an information transmission line for transmitting an information indicating a change in the state of the slave section through upper stage slave sections is provided between two slave sections located adjacent to each other and between the front slave section and the master section.
BRIEF DESCRIPTION OF THE DRA WINGS
Figure 1 is a diagram showing a serial transmission apparatus as one embodiment of the present invention;
Figure 2 is a block diagram showing a prior art serial transmission apparatus;
Figure 3 is a block diagram showing an internal construction of a slave section of the above embodiment;
Figure 4 is a block diagram showing an internal construction of the judgement control section 220 in the slave section;
Figure 5 is a block diagram showing the internal construction of the R1 section 230, and the R2 section 240; and
Figure 6 is a timechart showing the signals concerning the judgement control section 220, the R1 section 230, and the R2 section 240.
DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENTS
In order to explain the present invention in detail, reference will be particularly made to
Figure 1: In Figure 1 the same reference numerals are used to designate the same or corresponding elements as those shown in
Figure 2. The reference characters 4b, 4c, 4d designate information transmission lines provided between the slave sections 2a, 2b, 2c, 2d, respectively. The reference numeral 4a designates an information transmission line provided between the front slave section 2a and the master section 1.
The device will be operated as follows:
In a control mode, in order for the master section 1 to control the slave section 2b, the master section 1 transmits the address of the slave section 2b and also a control data for controlling the slave section 2b to the serial transmission line 3. The slave section 2b receives this signal, and when the address in the recieved data coincides with the address of the slave section 2b the control data is taken in, and a process in accordance with the control data is conducted. In other slave sections, the address in the received data does not coincide with the address of the slave section, and the received data is ignored.
Nextly in a supervising mode, when, for example, the internal switch in the slave section 2b is turned on from off state in order to collect state change information, the slave section 2b transmits the address of itself and the state change information to the upper stage slave section 2a through the information transmission line 4b. When the slave section 2a receives the data from the slave section 2b, the slave section 2a transmits the same data as the received data to the master section 1 through the information transmission line 4a. Thus, the master section 1 becomes possible to know the state change information of the slave section 2b, and to conduct a processing in accordance with the state change information.
As described above, the slave section receives an information from the lower stage slave section and hands it out to the upper stage slave section, and furthermore, the slave section collects the state change information and hands it out to an upper stage slave section. When the both parties' information conflict with each other, for example, either of the information is one indicating that one slave section has started a transmission earlier, the other slave section conducts a transmission after the transmission of the former one is completed.
The construction of each circuit for conducting such operations will be described with reference to Figure 3.
Figure 3 shows an internal construction of the slave section.
The same reference numerals are used to designate the same or corresponding elements as shown in Figure 1. The reference numeral 210 designates a transmission section for transmitting a signal to an upper stage slave section through a terminal 201. The reference numeral 220 designates a judgement control section, the numeral 230 designates a first signal generating section (hereinafter referred to as "R1 section"). The reference numeral 240 designates a second signal generating section (hereinafter referred to as "R2 section"), and the numeral 250 designates a clock generating section.
The information from the lower stage slave section is received by the R1 section 230 through the terminal 202. The information collected by this slave section is introduced to the R2 section 240 through the terminals 203-1, 203-2 ..., 203-n, and in this R2 section 240 it is converted into a signal of required format (the same one as the signal for
mat from the lower stage slave section). Controlled by the judgement control section 220, either of-the signals of the R1 section 230 and the R2 section 240 is sent to the upper
stage slave section through the transmission section 210 to be transmitted, and after the transmission is concluded the other transmission is started.The signal lines between the -R1 section 230 or the R2 section 240 and the transmission section 210 or the control judgement section 220 are described later.
The timing of signal transmission is controlled by the clock signal from the clock generating sectidn 250.
On the other hand, the control signal for controlling the slave section sent from the master section 1 is sent to each slave section through the serial transmission line 3, and only the control signal detected by the address detection section 260 is sent to the control signal generating section 270 to generate a desired control signal to be sent to each object to be controlled through the terminals 205-1, 205-2, ..., 205 mln the next
place, the details of the control judgement section 220, R1 section 230, R2 section 240 are described with reference to Figures 4, 5, and 6.
In Figure 4, the reference numeral 221 designates a flip-flop FF-11 for outputting a flag signal (hereinafter referred to as "R1 transmission F") while the Ri section 230 is conducting a transmission. The numeral 222 designates a flip-flop FF-12 for outputting a flag signal (hereinafter referred to as "R1 transmission request F") when the R1 section 230 outputs a transmission request. The
numeral 223 designates a gate. The numral
224 designates a flip-flop FF-21 for outputting
a flag signal (hereinafter referred to as "R2 transmission F") while the R2 section 240 is
conducting a transmission. The numeral 225
designates a flip-flop FF-22 for outputting a flag signal (hereinafter referred to as "R2 transmission request F") when the R2 section
240 outputs a transmission request. The numeral 226 designates a gate.When a transmission request signal is sent from the R1 section 23U through the signal line 2302 to the S terminal of the flip-flop FF-12 (222), the same is set to make the 0 terminal "H".
When the flip-flop FF-21 (224) is not set (the R2 transmission F is not output), the S terminal of the flip-flop FF-1 1 (221) is driven through the gate 223 to be set to make the O terminal "H", and the R1 transmission F signal is sent to the R1 section 230 through the signal line 2304. The R1 section 230 starts a transmission when it receives the R1 transmission F signal. The detailed operation thereof will be described later. When the R1 section 230 concludes the transmission, the R1 transmission conclusion signal is sent through the signal line 2303 to the flip-flops
FF-11 (221) and FF-12 (222) to make the same set with together thereby to return to their original state. The flip-flops FF-21 (224),
FF-22 (225) and the gate 226 operate in accordance with the R2 section 240.
When the R1 section 230 and the R2 section 240 conflict with each other, either of them waits its transmission until the other which started the transmission earlier concludes the transmission. This control is accomplished in such a manner that the gate inhibit the transmission by the other's transmission F signal even if the transmission request F of the either is established.
In Figure 5 the same numerals designate the same or corresponding elements as shown in
Figure 3.
The numeral 231 designates a register circuit intended to store the code signal of serial format temporarily which is sent from the lower stage slave section through the terminal 202 (R1 input singal) in a format capable of transmitting as a code signal of serial format.
The numeral 232 designates a ST detection circuit intended to detect that it has become a state where it is possible to conduct a transmission from that the front signal in the code signal of serial format has come up to some cell, and to send out a transmission request signal (R1 transmission request signal) through the signal line 2302. The numeral 233 designates a counter intended to detect the conclusion of transmission by counting the transmitting bit number of the signal of serial format, and to send out a transmission conclusion signal (R1 transmission conclusion signal) through a signal line 2303.The numeral 234 designates a gate circuit intended to supply clock signals output from the clock generator 250 to the shift register 231 when the transmission F signal (transmission allowance signal) is sent from the judgement control section 220 through the signal line 2304, and to send out the signal from the lower stage slave section stored in the shift register 231 through the signal line 2301.
Furthermore, the numeral 241 designates a register circuit intended to take in the information collected at the slave section through the terminals 203-1, 203-2 ..., 203-n (the signals taken in are hereinafter referred to as "R2 input signal"), and to store the signal which is converted into a code signal of parallel construction by the encoder circuit 245 in a format capable of transmitting as a code signal of series construction temporarily. The numeral 242 designates a ST detection circuit intended to detect that the signal stored as a code signal of serial format has become possible to be transmitted in a similar manner as in the ST detection circuit 232, and to transmit the transmission request signal (hereinafter referred to as "R2 transmission request signal") through the signal line 2402.The numeral 243 designates a counter intended to count the number of transmitting bit of the signal of serial format, and to transmit the transmission conclusion signal (R2 transmission conclusion signal) from the signal line 2403 by detecting the transmission conclusion timing. The numeral 244 designates a gate intended to supply clock signals output from the clock generator 250 to the shift register 241 when it receives the transmission F signal (transmission allowance signal) sent from the judgement control section 220 through the signal line 2404, and to send out the signal collected at the slave section stored in the shift register 241 through the signal line 2401.
The operation of the device will be described with reference to Figure 6: When the device becomes a state capable of transmitting the R1 input signal which is input from the lower stage slave section, the R1 transmission request signal is output from the ST detection circuit 232, and this signal is input to the flipflop FF-12 (222) thereby to make the same output an R1 request F signal. Then, if the R2 signal generator is not in the way of transmission, the R1 request F signal is sent to the flip-flop FF-11 (221) thereby to make the same output an R1 transmission F signal.This signal becomes R1 transmission allowance signal to enter the gate circuit 234, and clock signals output from the clock generating section 250 are sent to the shift register 231, and the code signal of serial format is sent out as an R1 output signal through the transmission section 210 constituted by OR circuits.
When the transmission of the R1 output signal is concluded, the R1 transmission conclusion signal is output from the counter 233 through the signal line 2303 to the flip-flop
FF-11 (221) and the flip-flop FF-12 (222) to reset the same, and the R1 transmission F and the R1 request F are both cancelled. The similar control is conducted to conduct a transmission as for the signals relating to the
R2 section 240. When the transmissions by the RI section 230 and by the R2 section 240 conflict with each other, only one transmission is conducted as described above.
The other slave sections also transmit serially the address of the state-changed slave section and the state change information to the upper stage slave section through an information transmission line subsequently when it receives an information from the lower stage slave section or the state of itself is changed.
Accordingly, it is not necessary for the master section 1 to conduct a polling against slave sections, resulting in a large amount of reduction in the burden to the master section 1.
According to the present invention, an information transmission line is provided between adjacent slave sections and between the front slave section and the master section, whereby it was made possible that a state change information is sent to the master section from each slave section through the upper stage slave section, and that each slave section conduct a transmission only when there is a need to send data. This construction made it unnecessary for the master section to conduct a polling periodically, thereby reducing the burden against the master section to a great extent.
Claims (2)
1. A serial transmission apparatus in which a master section supervises and controls a plurality of slave sections through a serial transmission line, wherein an information transmission line for transmitting an information indicating a change in the state of the slave section through upper stage slave sections is provided between two slave sections located adjacent to each other and between the front slave section and the master section.
2. A serial transmission apparatus substantially as herein described with reference to
Figs. 1 and 3 to 6 of the accompanying drawings.
Printed in the United Kingdom for
Her Malesty's Stationery Office, Dd 8818935, 1986, 4235.
Published at The Patent Office, 25 Southampton Buildings.
London. WC2A 1AY. from which copies may be obtained.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60019512A JPS61177841A (en) | 1985-02-04 | 1985-02-04 | Series transmitting device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8602643D0 GB8602643D0 (en) | 1986-03-12 |
| GB2170631A true GB2170631A (en) | 1986-08-06 |
| GB2170631B GB2170631B (en) | 1988-04-07 |
Family
ID=12001414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08602643A Expired GB2170631B (en) | 1985-02-04 | 1986-02-04 | A serial transmission apparatus |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS61177841A (en) |
| DK (1) | DK52286A (en) |
| FI (1) | FI860439A (en) |
| GB (1) | GB2170631B (en) |
| NO (1) | NO174650C (en) |
| SE (1) | SE464554B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2314434A (en) * | 1996-06-20 | 1997-12-24 | Bosch Gmbh Robert | Controlling information transmission between components |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5001980A (en) * | 1988-12-29 | 1991-03-26 | Komori Printing Machinery Co., Ltd. | Delivery apparatus for sheet-fed printing press |
| SE515316C2 (en) * | 1994-09-13 | 2001-07-16 | Ericsson Telefon Ab L M | Method and apparatus for controlling a data network |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB973309A (en) * | 1962-01-31 | 1964-10-21 | Carl Ludwig Lehner | Improvements in or relating to signalling circuit arrangements |
| GB1108462A (en) * | 1965-04-15 | 1968-04-03 | Hawker Siddeley Dynamics Ltd | Improved system for electronic data transmission, remote control and monitoring |
| GB1295189A (en) * | 1970-01-08 | 1972-11-01 | ||
| GB1437959A (en) * | 1972-05-19 | 1976-06-03 | Geophysique Cie Gle | Multiplexing transmission system |
| GB1451367A (en) * | 1972-12-15 | 1976-09-29 | Johnson Service Co | Data communication system employing a series loop |
| GB2030336A (en) * | 1978-09-06 | 1980-04-02 | Wolsey Emergency Audio Communi | Improvements Relating to Emergency Alarm Systems |
| GB2080000A (en) * | 1980-07-10 | 1982-01-27 | Shorrock Dev | Data Transmission System |
-
1985
- 1985-02-04 JP JP60019512A patent/JPS61177841A/en active Pending
-
1986
- 1986-01-28 NO NO860308A patent/NO174650C/en unknown
- 1986-01-30 FI FI860439A patent/FI860439A/en not_active Application Discontinuation
- 1986-02-03 DK DK52286A patent/DK52286A/en not_active Application Discontinuation
- 1986-02-04 SE SE8600473A patent/SE464554B/en not_active IP Right Cessation
- 1986-02-04 GB GB08602643A patent/GB2170631B/en not_active Expired
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB973309A (en) * | 1962-01-31 | 1964-10-21 | Carl Ludwig Lehner | Improvements in or relating to signalling circuit arrangements |
| GB1108462A (en) * | 1965-04-15 | 1968-04-03 | Hawker Siddeley Dynamics Ltd | Improved system for electronic data transmission, remote control and monitoring |
| GB1295189A (en) * | 1970-01-08 | 1972-11-01 | ||
| GB1437959A (en) * | 1972-05-19 | 1976-06-03 | Geophysique Cie Gle | Multiplexing transmission system |
| GB1451367A (en) * | 1972-12-15 | 1976-09-29 | Johnson Service Co | Data communication system employing a series loop |
| GB2030336A (en) * | 1978-09-06 | 1980-04-02 | Wolsey Emergency Audio Communi | Improvements Relating to Emergency Alarm Systems |
| GB2080000A (en) * | 1980-07-10 | 1982-01-27 | Shorrock Dev | Data Transmission System |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2314434A (en) * | 1996-06-20 | 1997-12-24 | Bosch Gmbh Robert | Controlling information transmission between components |
| FR2750276A1 (en) * | 1996-06-20 | 1997-12-26 | Bosch Gmbh Robert | METHOD FOR CONTROLLING THE TRANSFER OF INFORMATION BETWEEN COMPONENTS AND COMPONENTS FOR IMPLEMENTING THE METHOD |
| GB2314434B (en) * | 1996-06-20 | 1998-10-07 | Bosch Gmbh Robert | Method of controlling information transmission between components and component for carrying out the method |
Also Published As
| Publication number | Publication date |
|---|---|
| NO174650C (en) | 1994-06-08 |
| FI860439A0 (en) | 1986-01-30 |
| FI860439A (en) | 1986-08-05 |
| SE464554B (en) | 1991-05-06 |
| DK52286D0 (en) | 1986-02-03 |
| SE8600473L (en) | 1986-08-05 |
| JPS61177841A (en) | 1986-08-09 |
| NO860308L (en) | 1986-08-05 |
| NO174650B (en) | 1994-02-28 |
| DK52286A (en) | 1986-08-05 |
| GB8602643D0 (en) | 1986-03-12 |
| GB2170631B (en) | 1988-04-07 |
| SE8600473D0 (en) | 1986-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) |
Effective date: 19951108 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19970204 |