Method for transferring data detected by a plurality of sensors

• US 5,900,824 A
• Filed: 07/16/1997
• Issued: 05/04/1999
• Est. Priority Date: 07/23/1996
• Status: Expired due to Fees

• Current Assignee: Okuma Corporation
• Original Assignee: Okuma Corporation
• Inventors: Hayashi, Yasukazu
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): WONG, ALBERT KANG
• Application Number:
  US08/893,255
• Time in Patent Office: 657 Days
• Field of Search: 340/870.11, 340/870.07, 340/825.49, 340/825.06, 340/825.07, 340/825.08, 371/69.1, 370/377, 370/455, 370/461
• US Class Current: 340/870.11
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

To improve the flexibility in changing a transfer procedure and the efficiency in transferring data when a plurality of sensors transmit detected data to a detected data receiver. The detected data receiver transmits detected data transfer request command RS simultaneously to a plurality of sensors. A detected data transfer request command RS contains information regarding a network using order, to thereby inform respective sensors of a data transferring order. A sensor which has been requested to carry out data transferring by the command RS detects the completion of data transferring by a sensor which has been requested to carry out data transferring immediately preceding the sensor concerned, and then initiates its own data transferring. With this arrangement, a transfer procedure can be flexibly changed by using a request command RS, and useless intervals between data transfers by respective sensors are omitted.

Claims

1. A data transferring method for transferring data detected by a plurality of sensors to a detected data receiver via a bus connected type serial communication network to which the sensors are connected, wherein,

the detected data receiver transmits a detected data transfer request command to all of the sensors specifying a network using order which provides the order in which the sensors will transfer data to the detected data receiver, and

a sensor transfers data if it is first in the network using order or if it detects completion of data transferred by a sensor having a network using order number immediately preceding its own.

2. A data transferring method as defined in claim 1, wherein the sensors are each given a sensor identification number, and the network using order is specified by a sequence of sensor identification numbers that are included in the detected data transfer request command.

3. A data transferring method as defined in claim 2, wherein the sensors each detect the detected data transfer request command, determine whether or not its own sensor identification number is included in the network using order included in the detected data transfer request command, and wait for its turn to transfer data when its own sensor identification number is included in the network using order.

4. A data transferring method as defined in claim 3, wherein the sensors wait for their turns to transfer data do not transfer data when a waiting time exceeds a predetermined period of time.

5. A data transferring method as defined in claim 2, wherein,

each sensor whose turn it is to transfer data outputs a signal to the serial communication network which includes its own sensor identification number.

6. A data transferring method as defined in claim 5, wherein,

each sensor stores a sensor identification number of a sensor having a network using order immediately preceding its own, and determines whether it is its turn to transfer data by detecting a coincidence between the stored sensor identification number of the sensor having the network using order immediately proceeding its own, and the sensor identification number read from the signal outputted.

7. A data transferring method as defined in claim 5, wherein

the signal outputted by each of the sensors further includes data detectable by other sensors.

8. A data transferring method as defined in claim 7, wherein

each sensor stores a sensor identification number of a sensor having a network using order immediately preceding its own, and determines whether it is its turn to transfer data by detecting a coincidence between the stored sensor identification number of the sensor having the network using order immediately proceeding its own, and the sensor identification number read from the signal outputted.