AVR-Microcontroller
in the Ham-Shack
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AVR-Microcontroller |
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The APRS Telemetry Interface The Serial Interface
The ground pin of the connector is connected to pin 5 of the SubD-connector. The TXD-pin in the middle is connected to pin 2 of the SubD and the third pin, RXD is connected to pin 3. Depending on your cable to the PC you may have to exchange Pins 2 and 3 of the SubD-connector. The parameters of the line are preset to 9600Bd, 8 Databits, no parity, 1 stopbit.
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The serial line of the interface is used for configuration and for serial
output only. So there is no normal 9 pin SubD connector. It is only a 3 Pin
connector, P9/RS232. I use a little adaptor form the 3 Pin connector to the
SubD-system.
