Polling system for a duplex communications link

Details Polling system for a duplex communications link Polling system for a duplex communications link

G - Physics

06

F

340/90

G06F 13/22 (2006.01)

Patent

CA 1123491

- 1 - Abstract Channel efficiency in a communications link between a controller and multiple portable units is increased by polling the active units and a set number of inactive units in a sequence where a "poll" consists of sending the binary coded address of the portable unit. The stream of trans- mitted data bits is only interrupted by a response from the portable unit, then resumed at the end of the response or a given portion of the response. During the reception of the response, certain other types of messages can be sent out by the controller. Portable responses can be automatic re- sponses as to status, etc., or can be data initiated by the operator of the portable unit keyboard and stored in the portable unit memory until "armed" by the operator, then automatically transmitted to the controller when the portable unit address is received.

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