Cartridge system and method for setting a tool

A tandem sub for transmitting a setting signal, comprising:

• a body, the body having coupling components at a first end and a second end;
• a channel, extending through at least a portion of the body;
• a cartridge assembly, positioned within the channel, the cartridge assembly having circuitry for transmitting electrical signals from the first end to the second end;
• and
• a primary igniter, the primary igniter electrically coupled to the cartridge assembly via a downhole contact formed completely within the body.

A method for forming a perforating gun string, comprising:

• providing a perforating gun;
• positioning the cartridge assembly within a channel extending through a tandem sub;
• and
• positioning a primary igniter proximate the cartridge assembly, the primary igniter being within a body of the tandem sub to confirm a downhole contact between the primary igniter and the cartridge assembly within the body;
• coupling the tandem sub to the perforating gun at a first end, the tandem sub having a cartridge assembly forming an uphole contact with the perforating gun;
• and
• coupling a setting tool to a second end of the tandem sub, opposite the perforating gun, a power charge of the setting tool being explosively coupled to the cartridge assembly.