In a system wherein a number of computers are coupled to a common bus and the communication among them is effected through the bus, a data transmitting apparatus with which, when a plurality of computers have simultaneously made requests for communication with another computer, the communication is made possible from one of the highest priority level, said data transmitting apparatus being constructed such that larger addresses in binary codes are assigned in the order of the priority levels of ...

Multiple computer system in which a control signal manifestation is circulated by a single control line from one computer to the next to indicate that the computer receiving the control signal manifestation may have available to it for communication with another computer a common communications channel. If, upon receipt of a control signal manifestation, a computer desires to transmit via the channel, it "captures" the control signal manifestation. If not, or after a computer has completed its c...

In a data communication system in which data communication is carried out between two or more data processing units and at least one device to be controlled thereby, each coupled via data station to a common data transmission path connected in a loop fashion, a conflict preventing circuit is provided between said device to be controlled and the associated data station, which conflict preventing circuit comprises a flip-flop to be set in response to its own device identifying data received from a...

A protocol system for data processing equipment, particularly equipment used in building automation monitoring and control systems for air-conditioning control and monitoring of fire and security points is disclosed having a plurality of stations connected to a data bus, each station having an apparatus for monitoring the traffic on the data bus, calculating its turn to transmit or time slot during which it is permitted to transmit data on the bus and updating its calculated turn or time slot af...

A distributed multiprocessor communication system, wherein the central processing unit (CPU) is relieved of the burden of bus management by a scheme which multiplexes the interprocessor module communications bus, to which all processors are guaranteed access, so that only an addressed CPU may be interrupted from performing its dedicated data processing function. Associated with each independent processor is a communications interface unit or communications network routing unit which relieves the...

In a system which includes a common bus to which a plurality of units are connected for the transfer of information, such as a data processing system, information may be transferred during asynchronously generated information transfer cycles. Logic is provided for enabling a first unit to transfer first information to a second unit during a first request transfer cycle requesting that the second unit transfer second information to the first unit during a later first response transfer cycle. Logi...

A hot melt road-marking composition which comprises 15 to 40 weight percent of a thermoplastic binder resin having a softening point of 50.degree. to 160.degree. C., 10 to 30 weight percent of at least one species of phthalimide derivatives having the structural formula of ##SPC1## Is an integer of 1 or 2, and 30 to 75 weight percent of filler and pigment; said phthalimide derivative having a melting point of 90.degree. to 120.degree. C. and capable of dissolving said thermoplastic resin binder ...

A communications system includes a plurality of data processing stations each having a first communications means connected to a common communications channel. Each of the data processing stations also includes a second communications means adapted to be connected to one or more associated units. Each station includes a contention resolving circuit connected to a processing means, the first communications means and the second communications means. The contention resolving circuit is further coup...

A method of providing access to a multiplexed data bus having a plurality of data processing units coupled thereto. Each unit self-assigns sequence numbers thereto for identification purposes. The unit having the lowest sequence number obtains immediate access to the bus and may relinquish the bus by transmitting a control word, or token, with an incremented sequence number. All units receive the token but only the unit having the incremented sequence number gains access to the bus. The token pa...

Transferring mastership in a multi-master communications channel of a system having a plurality of intercommunicating stations is accomplished by a method which includes the grouping into a logical loop of high traffic stations those stations which must be serviced frequently, and the grouping into at least one other logical loop of low traffic stations those requiring less frequent service. The token signifying mastership is passed from station to station in the high traffic loop at a maximum s...