JPS57136239A - Device address switching system - Google Patents

Device address switching system

Info

Publication number
JPS57136239A
JPS57136239A JP56021229A JP2122981A JPS57136239A JP S57136239 A JPS57136239 A JP S57136239A JP 56021229 A JP56021229 A JP 56021229A JP 2122981 A JP2122981 A JP 2122981A JP S57136239 A JPS57136239 A JP S57136239A
Authority
JP
Japan
Prior art keywords
address
input
data
cpu
output device
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
Application number
JP56021229A
Other languages
Japanese (ja)
Inventor
Toshiaki Maruyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP56021229A priority Critical patent/JPS57136239A/en
Publication of JPS57136239A publication Critical patent/JPS57136239A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/06—Addressing a physical block of locations, e.g. base addressing, module addressing, memory dedication
    • G06F12/0646—Configuration or reconfiguration
    • G06F12/0653—Configuration or reconfiguration with centralised address assignment
    • G06F12/0661—Configuration or reconfiguration with centralised address assignment and decentralised selection

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE:To realize switching of the address to self-diagnosis and returning to the original place under the control of a CPU., by providing a means to deliver the proper and common addresses to plural input/output devices connected to a serial line. CONSTITUTION:Serial data is supplied to an input/output device to be connected to a serial line from a CPU through a serial line 6. Thus each input/output device receives the data only when coincidence is obtained between the address of the data and the address of the corresponding input/output device. In case the contents of the data are identical with the data by which the device address is switched, an FF5 is set to switch 4 the own device address to an address output circuit 3 which is common to all devices. The CPU gives an instruction to each input/output device to switch the address successively. When all input/output devices have the same common address, the data is transferred among the input/ output devices with no intervention of the CPU to perform self-diagnosis. Then the CPU gives an instruction to return the address of each input/output device to the original place when the self-diagnosis is over.
JP56021229A 1981-02-16 1981-02-16 Device address switching system Pending JPS57136239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56021229A JPS57136239A (en) 1981-02-16 1981-02-16 Device address switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56021229A JPS57136239A (en) 1981-02-16 1981-02-16 Device address switching system

Publications (1)

Publication Number Publication Date
JPS57136239A true JPS57136239A (en) 1982-08-23

Family

ID=12049189

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56021229A Pending JPS57136239A (en) 1981-02-16 1981-02-16 Device address switching system

Country Status (1)

Country Link
JP (1) JPS57136239A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58223831A (en) * 1982-06-23 1983-12-26 Nec Corp Selecting system of input and output device
JPH02181851A (en) * 1989-01-06 1990-07-16 Iwaki Denshi Kk Method and circuit for multi-access control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58223831A (en) * 1982-06-23 1983-12-26 Nec Corp Selecting system of input and output device
JPH02181851A (en) * 1989-01-06 1990-07-16 Iwaki Denshi Kk Method and circuit for multi-access control

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