Probing algorithm for foundation fieldbus protocol

Details Probing algorithm for foundation fieldbus protocol Probing algorithm for foundation fieldbus protocol

2005-09-13

2005-09-13

Gaffin, Jeffrey (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral configuration

C710S017000, C710S018000, C710S046000, C710S220000

Reexamination Certificate

active

06944681

ABSTRACT:
A hand-held communication control device which, when coupled to a process control system communication bus, controls communication occurring on the bus using a communication schedule that dictates when each of the devices coupled to the bus will be permitted to communicate on the bus. The hand-held communication control device further uses a probing algorithm to detect devices, including other communication control devices, that are coupled to the bus. The probing algorithm causes the hand-held communication control device to select an address from one of a set of three address lists to which a probe node message is then transmitted to detect the presence of a device at that address. One of the address lists is reserved for communication control devices and uses only a limited number of maximum possible addresses. The probe addresses are selected from each of the three address lists in a sequential manner and from among the three address lists in an alternating manner so that, when the communication control device takes control of a bus formerly controlled by another communication control device, the hand-held communication control device detects the presence of the other communication control device and relinquishes control of the bus to the other communication control device in a timely manner.

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Search Report under Section 17 issued by the United Kingdom Patent Office on Apr. 18, 2002.
Examination Report under Section 18(3) issued in GB 0121759.5 application by the United Kingdom Patent Office on May 27, 2004.

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