EP0444656A2
Expired / Lapsed
EP
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Multiplex communication system
Assignee: Toshiba Corp
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Filing: 1991-02-27
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Granted: —
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Expires: 2011-02-27
Abstract
Abstract Data having an ID code attached thereto is transferred via a network line (16). The ID code is detected by an ID code detection circuit (30) and data is received by a data receiving circuit (31). An ID code (RX ID) detected by the ID code detection circuit (30) and an ID code previously stored in an ID comparing register (32) are compared with each other by a comparator circuit (33). Predetermined ID codes corresponding to an engine rotation speed and car speed, for example, are stored in the ID comparing register (32). A masking circuit for masking one or more bits of the ID code is provided in the comparator circuit (33). The switching state of a switch (34) for controlling the transfer of data received by the data receiving circuit (31) is controlled according to a comparison output of the comparator circuit (33). when the ID codes are coincident with each other, the switch (34) is turned on, causing data received by the data receiving circuit (31) to be transferred to a CPU (18). A plurality of electronic instruments (10) can be selected by use of a single ID code by masking at least one bit of the ID code by means of a masking circuit.
Inventors
- 👤 Yasuo C/O Intellectual Property Division Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 14:04
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/40006; H04L12/40032; H04J; H04J99/00; H04J3/00; H04J3/24; B; B60; B60R; B60R16/00; B60R16/02; B60R16/03; B60R16/0315
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
111 words
A multiplex communication system for detecting an ID code attached to data received from a network, comparing the detected ID code with a predetermined ID code, and selectively transferring the received data to an instrument connected to the network and corresponding to the detected ID code when the detected ID code coincides with the predetermined ID code; characterized in that masking means (21, 22-1 to 22-6, 23) for masking at least one bit of the detected ID code at the time of comparison between the detected ID code and the predetermined ID code is provided and used to select a plurality of instruments (10-1, 10-2, 10-3, ---) for one ID code.
Claim 2
Dependent Claim
45 words
A multiplex communication system according to claim 1, characterized in that the bit position of the ID code to be masked by said masking means (21, 22-1 to 22-6, 23) and the predetermined ID code can be rewritten according to a command or a program.
Claim 3
Dependent Claim
106 words
A multiplex communication system according to claim 1, characterized in that said masking means (21, 22-1 to 22-6, 23) includes storing means (21) for storing a bit position of the ID code to be masked according to a command from a CPU (18), logical sum means (22-1 to 22-6) for deriving a logical sum of the stored data in said storing means (21) and a comparison output of said comparing means (20-1 to 20-6) and outputting a coincidence signal indicating the coincidence of the ID codes, and logical product means (23) for deriving a logical product of outputs from said logical sum means (22-1 to 22-6).
Claim 4
Dependent Claim
18 words
A multiplex communication system according to claim 3, characterized in that said storing means includes a register (21).
Claim 5
Dependent Claim
23 words
A multiplex communication system according to claim 3, characterized in that said logical sum means includes an OR gate circuit (22-1 to 22-6).
Claim 6
Dependent Claim
20 words
A multiplex communication system according to claim 3, characterized in that said logical product means includes an AND gate (23).
Claim 7
Dependent Claim
42 words
A multiplex communication system according to claim 1, characterized in that said comparing means includes exclusive-NOR means (20-1 to 20-6) for deriving an exclusive-NOR value of the ID code detected by said ID code detecting means (30) and the predetermined ID code.
Claim 8
Dependent Claim
75 words
A multiplex communication system according to claim 7, characterized in that said exclusive-NOR means includes Ex-NOR gates (20-1 to 20-6) of a number corresponding to the number of bits of the ID code and said Ex-NOR gates (20-1 to 20-6) are supplied with respective bits of the ID code detected by said ID code detecting means at one-side input terminals thereof and respective bits of the predetermined ID code at the other input terminals thereof.
Claim 9
Dependent Claim
21 words
A multiplex communication system according to claim 1, characterized by further comprising storing means (32) for storing the predetermined ID code.
Claim 10
Dependent Claim
18 words
A multiplex communication system according to claim 9, characterized in that said storing means includes a register (32).
Claim 11
Dependent Claim
33 words
A multiplex communication system according to claim 9, characterized by further comprising decoder means (36) for decoding data stored in said storing means (32) and supplying the decoded data to said comparing means.
Claim 12
Dependent Claim
207 words
A multiplex communication system for detecting an ID code attached to data received from a network, comparing the detected ID code with a predetermined ID code, and selectively transferring the received data to an instrument connected to the network and corresponding to the detected ID code when the detected ID code coincides with the predetermined ID code; characterized by comprising first storing means (32) for storing an ID code corresponding to an instrument based on a command from a CPU (18); comparing means (20-1 to 20-6) for comparing the ID code (RX ID) attached to data received from the network (16) with the ID code stored in said first storing means (32); second storing means (21) for storing a bit position of the ID code to be masked according to a command from said CPU (18); masking means (22-1 to 22-6) for masking a comparison output of said comparing means (20-1 to 20-6) according to data stored in said second storing means (21); and coincidence detecting means (23) for detecting the coincidence between the ID code attached to data received from said network (16) and the ID code stored in said first storing means (32) according to the comparison output of said comparing means (20-1 to 20-6).
Claim 13
Dependent Claim
19 words
A multiplex communication system according to claim 12, characterized in that said first storing means includes a register (32).
Claim 14
Dependent Claim
54 words
A multiplex communication system according to claim 12, characterized in that said comparing means includes exclusive-NOR means (20-1 to 20-6) for deriving the exclusive-NOR values between respective bits of the ID code attached to data received from said network (16) and respective bits of the ID code stored in said first storing means (32).
Claim 15
Dependent Claim
82 words
A multiplex communication system according to claim 14, characterized in that said exclusive-NOR means includes Ex-NOR gates (20-1 to 20-6) of a number corresponding to the number of bits of the ID code and said Ex-NOR gates (20-1 to 20-6) are supplied with respective bits of the ID code attached to data received from said network (16) at one-side input terminals thereof and respective bits of the ID code stored in said first storing means (32) at the other input terminals thereof.
Claim 16
Dependent Claim
19 words
A multiplex communication system according to claim 12, characterized in that said second storing means includes a register (21).
Claim 17
Dependent Claim
46 words
A multiplex communication system according to claim 12, characterized in that said masking means includes logical sum means (22-1 to 22-6) for deriving a logical sum between data stored in said second storing means (21) and a comparison output of said comparing means (20-1 to 20-6).
Claim 18
Dependent Claim
23 words
A multiplex communication system according to claim 17, characterized in that said logical sum means includes an OR gate circuit (22-1 to 22-6).
Claim 19
Dependent Claim
35 words
A multiplex communication system according to claim 12, characterized in that said coincidence detecting means includes logical product means (23) for deriving a logical product of the outputs of said masking means (22-1 to 22-6).
Claim 20
Dependent Claim
20 words
A multiplex communication system according to claim 19, characterized in that said logical product means includes an AND gate (23).
References Cited (Backward Citations)
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