In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Frank,

When connected to a serial port, the SX-Key always echoes back whatever character it receives. This is because on the SX-Key, the TxD and RxD lines are connected together via a resistor, so this only tells you that the serial cable, the connectors, and the COM port are ok. When you don't receive the "SK-Key" answer string after you have entered it, you (I'd better say the SX-Key) are in bad shape.

Thanks to Ken you'll have a new SX-Key soon. Here are some rules I follow when handling it:

Always turn off power before plugging or un-plugging the SX-Key to/from the device under test
Double-check that the SX-Key is correctly sitting on the four header pins before applying power. Normally, it will not get damaged when you plug it on in reverse but you most likely will fry it when you plug it in with an offset, e.g. only three header pins connected to the SX-Key, and one pin left open.

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