System for communication between a master and slave processing
First Claim
1. A connection system between at least one master unit and a plurality of slave units, comprising:
- a communication channel directly connected to said plurality of slave units and to said master unit, each slave unit of said plurality of slave units including logic means for exchanging communication messages with said master unit and for independently initiating transmission toward said master unit, said communication message has a preliminary field which can be used to activate said master and slave units from a resting state of minimum power consumption;
said slave and master units are connected to said communication channel by means which force said communication channel to a different logical level when said communication channel is occupied by one of said master and slave units in order to send said communication message, said master and slave units detecting that said communication channel is in a free condition for the forwarding of said communication message by means for detecting said different logical level of said communication channel; and
said master unit including means for receiving said communication message from one of said plurality of slave units and for sensing said communication message to another of said plurality of slave units.
1 Assignment
0 Petitions
Accused Products
Abstract
A communication system of the multiplex type between a master processing unit incorporating a microprocessor and slave units associated in particular with electrical devices in a vehicle for activating or controlling at least one electrically functioning component of the corresponding device the slave units being connected in groups to the master unit by means of corresponding communication channels, and in which these slave units include logic means for the exchange of communication messages with the master unit and are capable of independently initiating transmission towards the master unit; such messages in particular include a first field for identification of the slave unit which is sending or is to receive the communication, a second data field, and a preliminary field used to activate such units from a resting state of minimum power consumption.
24 Citations
25 Claims
-
1. A connection system between at least one master unit and a plurality of slave units, comprising:
-
a communication channel directly connected to said plurality of slave units and to said master unit, each slave unit of said plurality of slave units including logic means for exchanging communication messages with said master unit and for independently initiating transmission toward said master unit, said communication message has a preliminary field which can be used to activate said master and slave units from a resting state of minimum power consumption; said slave and master units are connected to said communication channel by means which force said communication channel to a different logical level when said communication channel is occupied by one of said master and slave units in order to send said communication message, said master and slave units detecting that said communication channel is in a free condition for the forwarding of said communication message by means for detecting said different logical level of said communication channel; and said master unit including means for receiving said communication message from one of said plurality of slave units and for sensing said communication message to another of said plurality of slave units. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A connection system between at least one master unit and a plurality of slave units, comprising:
-
a communication channel directly connected to said plurality of slave units and to said master unit, each slave unit of said plurality of slave units including logic means for exchanging communication messages with said master unit and for independently initiating transmission toward said master unit, said slave units are associated with electrical devices in a vehicle for activating or controlling at least one electrically functioning member in said electrical devices; and said system further comprising a first of said slave units being by means of said logical means capable of sending to said master unit a first communication message to actuate one of said electrical devices controlled by a second of said slave units, said master unit is capable of sending a second actuation command message for said second of said slave units, said second slave unit is capable of sending to said master unit a third message providing information about said actuation, and that said master unit is capable of sending of said first slave unit a fourth message confirming receipt of the actuation command from said second slave unit. - View Dependent Claims (22, 23, 24, 25)
-
Specification