Error display device of data transmission system

• US 5,357,517 A
• Filed: 06/23/1992
• Issued: 10/18/1994
• Est. Priority Date: 12/26/1989
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Komatsu Seisakusho
• Original Assignee: Kabushiki Kaisha Komatsu Seisakusho
• Inventors: Takebe, Makoto
• Primary Examiner(s): Baker, Stephen M.
• Application Number:
  US07/862,553
• Time in Patent Office: 847 Days
• Field of Search: 371/29.1, 371/20.1., 371/5.1, 395/575, 340/825.16
• US Class Current: 714/704
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks

Abstract

An error display device of a data transmission system in which a plurality of nodes are connected to a main controller to transmit data, the main controller being adapted to discriminate an error content and an error position from an error signal contained in a data frame signal transmitted from the nodes and to display the error content and position. Since it is so arranged that the storage content of temporary memory for temporarily storing therein a signal corresponding to the error content and the error position is not updated each time the error signal is inputted but updated intermittently according to an operator'"'"'s instruction, even when errors frequently take place at a multiplicity of locations, that is, even when it is difficult for an operator to confirm error display contents, the operator can reliably confirm the error contents.

Claims

1. An error display device of a data transmission system in which a plurality of nodes are connected to a main controller to transmit data, the main controller being adapted to discriminate presence or absence of an error, an error content and an error position from an error signal contained in a data frame signal transmitted from the nodes and to display the error content and error position wherein the main controller comprises:

an error kind register for temporarily storing therein a signal corresponding to the error content;

an error position register for temporarily storing therein a signal corresponding to the error position;

clear operating means for instructing to clear storage data in the error kind register and the error position register;

update control means having a first mode in which the storage data in the error kind register and the error position register are updated each time an error is detected as well as a second mode in which storage data in the error kind register and the error position register are cleared when a clear instruction from the clear operating means is inputted, the data in the error kind register and the error position register being updated by the error content and the error position when an error is detected first after the clear instruction, and thereafter the updating of the error kind register and the error position register is disabled until a next clear instruction of the clear operating means is inputted, the update control means controlling storage updating operations of the error kind register and the error position register in either one of said two modes;

error counting means for counting the number of errors detected in the error signal; and

display means for displaying thereon the temporary storage data in the error kind register and the error position register and an output of the error counting means.

2. An error display device of a data transmission system in which a plurality of nodes are connected to a main controller to transmit data, the main controller being adapted to discriminate presence or absence of an error, an error content and an error position from an error signal contained in a data frame signal transmitted from the nodes and to display the error content and error position, wherein the main controller comprises:

error detecting means for detecting generation of an error on the basis of the error signal;

an error kind register for temporarily storing therein a signal corresponding to the error content;

an error position register for temporarily storing therein a signal corresponding to the error position;

clear operating means for instructing to clear storage date in the error kind register and the error position register;

display mode selecting means for selecting one of two display modes;

clear signal generating means, when a clear instruction is issued from the clear operating means for, in response to a clear instruction being issued, outputting a clear signal to clear the storage data in the error kind register and the error position register;

clear detecting means for detecting the cleared storage data in the error kind register and the error position register;

update control means for, in response to selection of the first one of the two display modes, updating the storage data in the error kind register and the error position register by a corresponding error content and error position each time an error signal is outputted from the error detecting means and, when the second one of the two display modes is selected, for updating the data in the error kind register and the error position register by the error content and the error position only when an error detection signal is outputted the first time after a clear detection signal is outputted from the clear detecting means;

error counting means for counting the number of errors detected detected in the error signal; and

display means for displaying thereon the temporary storage data in the error kind register and the error position register and an output of the error counting means.