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In serial communication data is transmitted as a sequence in time. Main advantage: much less wires needed. Main disadvantage: Higher bandwidth for the same throughput.

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Kicking RJ11 cash drawer via PC's serial port

The solution I came up with was to use an RJ12 to Serial adapter to connect the drawer to PC and trying to trigger it by activating certain pins. … I've tried using the serial DTR and RTS pins as I can activate those individually. It might be a simple case of the PC's serial port not providing sufficient voltage. …
Roy de Jong's user avatar