JPS6473921A - Backup system - Google Patents
Backup systemInfo
- Publication number
- JPS6473921A JPS6473921A JP23180887A JP23180887A JPS6473921A JP S6473921 A JPS6473921 A JP S6473921A JP 23180887 A JP23180887 A JP 23180887A JP 23180887 A JP23180887 A JP 23180887A JP S6473921 A JPS6473921 A JP S6473921A
- Authority
- JP
- Japan
- Prior art keywords
- controller
- controllers
- outgoing
- changeover device
- line
- 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
Landscapes
- Selective Calling Equipment (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
PURPOSE:To allow plural devices to act like a backup device by providing a changeover device able to easily intercept a data stream of an incoming line and an outgoing line. CONSTITUTION:Controllers 1-3 are connected to a 4-wire line via a changeover device 10 to allow a designation means 20 of the changeover device 10 to use the controller 1 as an active set and the controller 2 as a standby set, for example, and when a fault takes place in the active controller 1, the controller 2 designated by the designation means 20 sends a transmission request signal RS2. Then an outgoing line selection means 30 sends a transmission data of the controller 2 to the outgoing 4-wire line and returns it to the receiver side of the controllers 1-3. Thus, it is possible to operate sequentially the plural controllers 1-3 as a backup device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23180887A JPS6473921A (en) | 1987-09-16 | 1987-09-16 | Backup system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23180887A JPS6473921A (en) | 1987-09-16 | 1987-09-16 | Backup system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6473921A true JPS6473921A (en) | 1989-03-20 |
Family
ID=16929341
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23180887A Pending JPS6473921A (en) | 1987-09-16 | 1987-09-16 | Backup system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6473921A (en) |
-
1987
- 1987-09-16 JP JP23180887A patent/JPS6473921A/en active Pending
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