JPS57204651A - Remote monitoring system - Google Patents
Remote monitoring systemInfo
- Publication number
- JPS57204651A JPS57204651A JP56090243A JP9024381A JPS57204651A JP S57204651 A JPS57204651 A JP S57204651A JP 56090243 A JP56090243 A JP 56090243A JP 9024381 A JP9024381 A JP 9024381A JP S57204651 A JPS57204651 A JP S57204651A
- Authority
- JP
- Japan
- Prior art keywords
- clock
- monitored
- information
- station
- time
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
Abstract
PURPOSE:To avoid the deterioration of a remote monitoring system although a signal line has a fault, by setting a peculiar clock at each station to be monitored to control the transmission of information of the station to be monitored and at the same time transmitting a clock correcting signal with a proper period to correct the error of the clocks. CONSTITUTION:A monitor station 1 transmits a clock correcting signal with a period of time (mnt) by a clock 9 with the control of a transmission switch 12. The stations 2, 3 and 4 to be monitored detect the clock correcting signals through a clock correction detector 11 then corrects the clock 9 to transmit the information with time intervals (0), (t) and (2t) which are indicated by the clock 9. In other words, the information of the stations 2, 3 and 4 are transmitted at the times t0, (t0+nXt)-(t0+(m-1)nt), the times (t0+t), (t0+(n+1)t)-(t0 {(m-1)n+1}t), and the times (t0+2t), (t0+(n+2)t)-(t0+{(m-1)n+2}t) respectively. The clock correcting signal is detected again at the time t0+mnt to repeat the above-mentioned operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56090243A JPS57204651A (en) | 1981-06-12 | 1981-06-12 | Remote monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56090243A JPS57204651A (en) | 1981-06-12 | 1981-06-12 | Remote monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57204651A true JPS57204651A (en) | 1982-12-15 |
Family
ID=13993051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56090243A Pending JPS57204651A (en) | 1981-06-12 | 1981-06-12 | Remote monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57204651A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59117349A (en) * | 1982-12-23 | 1984-07-06 | Toshiba Corp | Data transmitter |
| JPS60109347A (en) * | 1983-11-18 | 1985-06-14 | Toshiba Corp | Polling type remote monitor controller |
| JPS60254352A (en) * | 1984-05-31 | 1985-12-16 | Fujitsu Ltd | Synchronizing method of microprocessor in data transmission system |
| JPS6130840A (en) * | 1984-07-23 | 1986-02-13 | Nec Corp | Cyclic remote supervisory equipment |
| JPS61145943A (en) * | 1984-12-17 | 1986-07-03 | ハネウエル・インコーポレーテツド | Method and apparatus for synchronizing timing subsystem of module in local area network |
-
1981
- 1981-06-12 JP JP56090243A patent/JPS57204651A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59117349A (en) * | 1982-12-23 | 1984-07-06 | Toshiba Corp | Data transmitter |
| JPS60109347A (en) * | 1983-11-18 | 1985-06-14 | Toshiba Corp | Polling type remote monitor controller |
| JPS60254352A (en) * | 1984-05-31 | 1985-12-16 | Fujitsu Ltd | Synchronizing method of microprocessor in data transmission system |
| JPS6130840A (en) * | 1984-07-23 | 1986-02-13 | Nec Corp | Cyclic remote supervisory equipment |
| JPS61145943A (en) * | 1984-12-17 | 1986-07-03 | ハネウエル・インコーポレーテツド | Method and apparatus for synchronizing timing subsystem of module in local area network |
| JPH0362336B2 (en) * | 1984-12-17 | 1991-09-25 | Honeywell Inc |
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