| 摘要 |
PCT No. PCT/GB95/02666 Sec. 371 Date May 7, 1997 Sec. 102(e) Date May 7, 1997 PCT Filed Nov. 14, 1995 PCT Pub. No. WO96/16311 PCT Pub. Date May 30, 1996This invention relates to a detonator firing circuit comprising a control unit and a plurality of detonator circuits. The detonator circuits are arranged to simultaneously receive a "fire" signal and the fire signal initiates all the delay arrangements to allow different groups of detonators to detonate at different times in accordance with a predetermined firing program. In the present invention each detonator circuit has a code individual thereto and the control unit can control and transmit information to every detonator circuit, including the delay to be imparted to the detonator circuit. The identification code for each detonator circuit is preferably one of a large number of identification codes so that the likelihood of the two detonator circuits having the same identification code and having the same firing circuit is extremely small.
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