Field sensor communication method and system

Details Field sensor communication method and system Field sensor communication method and system

1990-03-02

1993-02-02

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

Plural transmitters

34087018, 3408255, 340310R, G08C 1916

Patent

active

051841215

ABSTRACT:
In a communication system in which a plurality of communication units are connected to a common two-wire transmission line and signal transmission/reception is made between the communication unit and a field sensor connected to one end of the transmission line, the communication unit transmits a signal to the field sensor under the condition that no signal is present on the transmission line during a period of time not shorter than a predetermined time while the field sensor transmits a signal indicative of in-use of the transmission line at an interval of time shorter than the predetermined time during a period of time until the field sensor sends back a signal in response to the signal from the communication unit, whereby signal collision between the plurality of communication units is prevented with no provision of any specific means.

REFERENCES:
patent: 4332027 (1982-05-01), Malcolm et al.
patent: 4471481 (1984-09-01), Shaw et al.
patent: 4516122 (1985-05-01), Tomikowa
patent: 4598285 (1986-07-01), Hoshen
patent: 4737787 (1988-04-01), Ito et al.
patent: 4901348 (1990-02-01), Nichols et al.

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