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What is the hardware connection between the AVR clock and the RS-232 interface on the computer?

April 26, 2017avr clock Computer connection hardware interface RS-232

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What is the hardware connection between the AVR clock and the RS-232 interface on the computer?

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You will need a cable consisting of a female DB-9 connector (for most PCs) and the 3-pin connector included with the clock. Wiring is as follows: 3-pin connector – 1:GND, 2:out/RXpc, 3:in/TXpc. DB-9 connector – 5:GND, 2:RX, 3:TX. Pin 1 of the 3-pin connector is next to the +(positive) pin of the Power Connector and is marked as 1 on the connector itself.