Patent ID: 8369063

Claim:
An apparatus comprising: a circuit comprising: a line input for receiving a line power; a line output for transmitting the line power; a next-gun-detect output; a next-gun-detect input; a first detonator connection; a second detonator connection, the second detonator connection being connected to a ground; the line input being coupled to the first detonator connection through: a one-polarity-pass component that only allows power of a first polarity to pass; and a detonate-enable switch circuit that is coupled to the next-gun-detect output and the line input, the detonate-enable switch passing power only if (a) the next-gun-detect output is not coupled to the next-gun-detect input and (b) power of a second polarity has previously been applied to the line input while the next-gun-detect output is not coupled to the next-gun-detect input.