no matter which type of Blitz you are using (serial or USB) you will need a separate 5V power supply for the Blitz, and you must isolate the Vdd pin on the Blitz from the target SX device.
Parallax once sold a device called SX Ring but I think it is no longer available. You could build something similar with just a few components, or use the SX-Key USB which comes with an isolated Vdd pin per-se, taking its 5V supply from the USB port.
Steel
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no matter which type of Blitz you are using (serial or USB) you will need a separate 5V power supply for the Blitz, and you must isolate the Vdd pin on the Blitz from the target SX device.
Parallax once sold a device called SX Ring but I think it is no longer available. You could build something similar with just a few components, or use the SX-Key USB which comes with an isolated Vdd pin per-se, taking its 5V supply from the USB port.
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Greetings from Germany,
G