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The purpose of this system is to design an interface for easily attaching terminals to a common bus without requiring the installer to define an address or any other form of identification of the terminals.
English (United States)
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Multipoint without Address
The purpose of this system is to design an interface for easily attaching
terminals to a common bus without requiring the installer to define an address or
any other form of identification of the terminals.
The transmit and receive sections of each terminal are referenced E and R,
respectively. Devices E and R of each terminal are attached to the bus through a
dual switch (S, S') as shown in the figure. It should be noted that within each
terminal a strap is used for connecting together the position (1) of both switches.
The possible states of each terminal are: receive mode, transmit mode, and
The controller is initially loaded with the number of associated terminals.
Initially, all the switches have been set to position (1). When the controller starts
polling, the first terminal is the only one to be made aware of that through
switches S1 and S'1 set in position (1). This terminal may start a transaction with
the controller. At the transaction end, the controller sends a switch request, and
the terminal switches to position (2). In this position, R1 is still connected to the
bus while E1 is disconnected therefrom. The first terminal then waits for a
general reset request and ignores any other message. The continuity of the bus
is thus established up to the second terminal (E2, R2). The same procedure
occurs with this terminal, and so on up to the last terminal.
The controller having initially been loaded with the number...