Method and device for the asynchronous transmission of data by packets

Claim 1

A method for use in a device for multipoint type of asynchronous series communication of logic messages between several transceivers connected in parallel to a network, the messages being formed of a succession of bits, without incorporated clock, grouped in coded characters separated by intervals, each character comprising a beginning of character bit and an end of character bit, the messages comprising a beginning of message character, at least one character designating the address of an addressee, one or more optional characters designating the address of a sender, optional significant characters, and an end of message character, the method comprising a first reception phase during which the sender listens to the signals which may be present on the network and generates an inhibition order which inhibits transmission as long as a signal is present, a second transmission phase during which the sender transmits a message and proceeds with the simultaneous reception of the signals and characters present in the network, comparison between the received signals and the transmitted signals, and interruption of the transmission of the message if the received signals and the transmitted signals differ, the interrupted transmission being begun again subsequently after a new initial reception phase of random duration, wherein: when the received signals and the transmitted signals differ, the sender inhibits the transmission of the message so that it transmits no bit over the network after the inhibition order; and the beginning of message and end of message characters comprise a continuous pulse whose duration is equal to the duration of the whole of the significant bits forming an intermediate character of the messages increased by the duration of two bits.

Claim 2

A method for use in a device for multipoint type of asynchronous series communication of logic messages between several transceivers connected in parallel to a network, the messages being formed of a succession of bits, without incorporated clock, grouped in coded characters separated by intervals, each character comprising a beginning of character bit and an end of character bit, the messages comprising a beginning of message character, at least one character designating the address of an addressee, one or more optional characters designating the address of a sender, optional significant characters, and an end of message character, the method comprising a first reception phase during which the sender listens to the signals which may be present on the network and generates an inhibition order which inhibits transmission as long as a signal is present, a second transmission phase during which the sender transmits a message and proceeds with the simultaneous reception of the signals and characters present in the network, comparison between the received signals and the transmitted signals, and interruption of the transmission of the message if the received signals and the transmitted signals differ, the interrupted transmission being begun again subsequently after a new initial reception phase of random duration, wherein: when the received signals and the transmitted signals differ, the sender inhibits the transmission of the message so that it transmits no bit over the network after the inhibition order; and the beginning of message and end of message characters comprise a continuous pulse whose duration is equal to the duration of the whole of the significant bits forming an intermediate character of the messages increased by the duration of two bits.

Claim 6

A method for use in a device for multipoint type of asynchronous series communication of logic messages between several transceivers connected in parallel to a network, the messages being formed of a succession of bits, without incorporated clock, grouped in coded characters separated by intervals, each character comprising a beginning of character bit and an end of character bit, the messages comprising a beginning of message character, at least one character designating the address of an addressee, one or more optional characters designating the address of a sender, optional significant characters, and an end of message character, the method comprising a first reception phase during which the sender listens to the signals which may be present on the network and generates an inhibition order which inhibits transmission as long as a signal is present, a second transmission phase during which the sender transmits a message and proceeds with the simultaneous reception of the signals and characters present in the network, comparison between the received signals and the transmitted signals, and interruption of the transmission of the message if the received signals and the transmitted signals differ, the interrupted transmission being begun again subsequently after a new initial reception phase of random duration, wherein: when the received signals and the transmitted signals differ, the sender inhibits the transmission of the message so that it transmits no character over the network after the inhibition order; and the random duration, which a sender must wait before transmitting a message after the last signal received over the network, is modified as a function of the message to be transmitted.

Claim 7

A method for use in a device for multipoint type of asynchronous series communication of logic messages between several transceivers connected in parallel to a network, the messages being formed of a succession of bits, without incorporated clock, grouped in coded characters separated by intervals, each character comprising a beginning of character bit and an end of character bit, the messages comprising a beginning of message character, at least one character designating the address of an addressee, one or more optional characters designating the address of a sender, optional significant characters, and an end of message character, the method comprising a first reception phase during which the sender listens to the signals which may be present on the network and generates an inhibition order which inhibits transmission as long as a signal is present, a second transmission phase during which the sender transmits a message and proceeds with the simultaneous reception of the signals and characters present in the network, comparison between the received signals and the transmitted signals, and interruption of the transmission of the message if the received signals and the transmitted signals differ, the interrupted transmission being begun again subsequently after a new initial reception phase of random duration, wherein: when the received signals and the transmitted signals differ, the sender inhibits the transmission of the message so that it transmits no character over the network after the inhibition order; and the random duration, which a sender must wait before transmitting a message after the last signal received over the network, is modified as a function of the message to be transmitted.

Claim 9

A device for the asynchronous series communication, of multipoint type, of logic messages between several transceivers connected in parallel to a network, each transceiver comprising: means for storing each character forming the message to be transmitted, means for transmitting in series the bits forming the messages, means for receiving and storing the signals received over the network, means for generating the characters designating the address of the sender(s) and that of the addressee, means for comparing the signals corresponding to the message to be transmitted and the signals corresponding to the message received simultaneously by the reception means, means for inhibiting the transmission for a random time if the signals present and transmitted differ, means for organizing the messages into a succession of bits grouped into coded characters, without incorporated clock, each character transmitted comprising a set of significant bits preceded by a beginning of character bit and followed by an end of character bit, timing means for producing inhibition of the transmission for a random time greater than a predetermined waiting time following reception of a preceding signal, means for generating in the transmitter a beginning of message character and means in the receiver for detecting the beginning of message character, means for generating in the transmitter an end of message character and means for detecting in the receiver the end of message character, means for conditioning, in the transmitter, the messages into a succession of characters with a beginning of message character, intermediate characters, and an end of message character, means for deconditioning the messages in the receiver and extracting the intermediate characters, wherein: the means for producing a beginning of message character are formed by the means themselves generating the intermediate characters of the messages, these means generating a character of the same duration as a current intermediate character, comprising a continuous pulse whose duration is equal to the duration of the set of significant bits forming an intermediate character of the messages, increased by the duration of two bits.

Claim 10

A device for the asynchronous series communication, of multipoint type, of logic messages between several transceivers connected in parallel to a network, each transceiver comprising: means for storing each character forming the message to be transmitted, means for transmitting in series the bits forming the messages, means for receiving and storing the signals received over the network, means for generating the characters designating the address of the sender(s) and that of the addressee, means for comparing the signals corresponding to the message to be transmitted and the signals corresponding to the message received simultaneously by the reception means, means for inhibiting the transmission for a random time if the signals present and transmitted differ, means for organizing the messages into a succession of bits grouped into coded characters, without incorporated clock, each character transmitted comprising a set of significant bits preceded by a beginning of character bit and followed by an end of character bit, timing means for producing inhibition of the transmission for a random time greater than a predetermined waiting time following reception of a preceding signal, means for generating in the transmitter a beginning of message character and means in the receiver for detecting the beginning of message character, means for generating in the transmitter an end of message character and means for detecting in the receiver the end of message character, means for conditioning, in the transmitter, the messages into a succession of characters with a beginning of message character, intermediate characters, and an end of message character, means for deconditioning the messages in the receiver and extracting the intermediate characters, wherein: the means for producing a beginning of message character are formed by the means themselves generating the intermediate characters of the messages, these means generating a character of the same duration as a current intermediate character, comprising a continuous pulse whose duration is equal to the duration of the set of significant bits forming an intermediate character of the messages, increased by the duration of two bits.

Claim 14

A device for the asynchronous series communication, of multipoint type, of logic messages between several transceivers connected in parallel to a network, each transceiver comprising: means for storing each character forming the message to be transmitted, means for transmitting in series the bits forming the messages, means for receiving and storing the signals received over the network, means for generating the characters designating the address of the sender(s) and that of the addressee, means for comparing the signals corresponding to the message to be transmitted and the signals corresponding to the message received simultaneously by the reception means, means for inhibiting the transmission for a random time if the signals present and transmitted differ, means for organizing the messages into a succession of bits grouped into coded characters, without incorporated clock, each character transmitted comprising a set of significant bits preceded by a beginning of character bit and followed by an end of character bit, timing means for producing inhibition of the transmission for a random time greater than a predetermined waiting time following reception of a preceding signal, means for generating in the transmitter a beginning of message character and means in the receiver for detecting the beginning of message character, means for generating in the transmitter an end of message character and means for detecting in the receiver the end of message character, means for conditioning, in the transmitter, the messages into a succession of characters with a beginning of message character, intermediate characters, and an end of message character, means for conditioning the messages in the receiver and extracting the intermediate characters, wherein: the means for producing an end of message character are formed by the means themselves generating the intermediate characters of the messages, these means generating a character of the same duration as a current intermediate character, comprising a continuous pulse whose duration is equal to the duration of the set of significant bits forming an intermediate character of the messages, increased by the duration of two bits.

Claim 15

A device for the asynchronous series communication, of multipoint type, of logic messages between several transceivers connected in parallel to a network, each transceiver comprising: means for storing each character forming the message to be transmitted, means for transmitting in series the bits forming the messages, means for receiving and storing the signals received over the network, means for generating the characters designating the address of the sender(s) and that of the addressee, means for comparing the signals corresponding to the message to be transmitted and the signals corresponding to the message received simultaneously by the reception means, means for inhibiting the transmission for a random time if the signals present and transmitted differ, means for organizing the messages into a succession of bits grouped into coded characters, without incorporated clock, each character transmitted comprising a set of significant bits preceded by a beginning of character bit and followed by an end of character bit, timing means for producing inhibition of the transmission for a random time greater than a predetermined waiting time following reception of a preceding signal, means for generating in the transmitter a beginning of message character and means in the receiver for detecting the beginning of message character, means for generating in the transmitter an end of message character and means for detecting in the receiver the end of message character, means for conditioning, in the transmitter, the messages into a succession of characters with a beginning of message character, intermediate characters, and an end of message character, means for conditioning the messages in the receiver and extracting the intermediate characters, wherein: the means for producing an end of message character are formed by the means themselves generating the intermediate characters of the messages, these means generating a character of the same duration as a current intermediate character, comprising a continuous pulse whose duration is equal to the duration of the set of significant bits forming an intermediate character of the messages, increased by the duration of two bits.