JPS6010348A - Connection test system - Google Patents

Abstract

PURPOSE:To conduct the connection test by providing fixed information registers respectively to plural devices and also providing a reading/storage device of register information to which a common bus is connected to activate the reading/storage device by a single command from a central processing device. CONSTITUTION:In checking the connecting state of each device, the central processing unit indicates the reading of fixed information of each device TM to the information reading/storage device RH by a single command. The information reading/storage device RH transmits the instruction of fixed information transmission to devices TM1-TMn by this instruction. The devices TM1-TMn return the storage information of fixed information storage registers RG1 RGn. The information reading/storage device RH stores the information to the own return information storage memory MM. When the return information from all the devices is collected, the report of end is transmitted to a CPU. The CPU confirms the return information storage memory in the information reading/storage device RH and tests the connecting state.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a method for simply testing the connection status of a plurality of devices connected to one common bus.

(2) Prior art and problems Conventionally, in a system in which multiple devices TMI to TMn are connected to one common bus BUS as shown in Figure 1, confirmation of the connection between the devices and the bus has been performed. This must be done before starting.

Therefore, the central processing unit CPU sequentially executes write-related instructions to write to each device TMI to TMn, and then sequentially executes read-related instructions to read. The connection is verified based on the information returned from each device. Reading may be performed immediately after writing and connection confirmation for each individual terminal may be performed, but in either case, there is a drawback that the connection test requires a large amount of time when the number of terminals increases.

(3) Purpose of the Invention The purpose of the present invention is to improve the above-mentioned drawbacks and to provide a method for simply testing the connection state.

(4) Structure of the Invention The structure of the present invention for achieving the above-mentioned object is that devices in a system in which a plurality of devices and a central processing unit are connected to one common bus are connected to the common bus. In this method, each of the plurality of devices is provided with a fixed information storage register, and is further equipped with a device for reading and holding the register information connected to a common bus. This is to operate the holding device and perform a connection test.

(5) Embodiment of the Invention FIG. 2 is a block diagram showing the configuration of an embodiment of the invention. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts. RGI to RGn are fixed information storage registers provided in each device. RH is an information reading/holding device that is connected to the common bus BUS and reads and holds the information in the surface information storage register. When the central processing unit starts checking the connection status of each device, it instructs the information reading/holding device RH to read the fixed information of each device TM by a single command. Based on the instruction, the information reading/holding device RH issues a fixed information sending instruction to each device TMI to TMn. Each of the devices TM1-TMn returns the information stored in the fixed information storage registers RGI-RGn. The information reading/holding device RH stores the returned information in its own return information storage memory MM. When return information from all devices is collected, a completion report is sent to the central processing unit CPU. The central processing unit checks the contents of the return information storage memory in the information reading and holding device RH at an appropriate time, and tests the connection state of each device TMI to TMn.

(6) Effects of the Invention In this manner, according to the present invention, the central processing unit can test the connection status of all devices by simply sending out a predetermined instruction, so the test processing procedure is simplified. This is suitable for systems that connect a large number of devices, as it enables urgent processing without delay.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining a conventional connection test method using a common bus, and FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. TM 1 to TM n-device BUS-common bus CPU
-Central processing units RGI to RGn -Fixed information storage register RH---Information reading/holding device MM -Return information storage memory Patent applicant Fujitsu Limited Agent Patent attorney Eisuke Suzuki

Claims (1)

[Claims] In a method for testing whether a device in a system in which a plurality of devices and a central processing unit are connected to one common bus is connected to the common bus, each of the plurality of devices is provided with a fixed information storage register, further comprising a device for reading and holding the register information connected to a common bus;
A connection test method that performs a connection test by operating a reading/holding device based on a single command from a central processing unit.