HP50g - RS-232 cable

[joeres]

(10-12-2016 01:38 PM)Claudio L. Wrote:  If all you want is to connect to a PC, the USB to TTL serial is your best choice. If you want to connect with other RS-232 devices, then you need the level shifter.

Hi Claudio,
Thanks for the explanations. For the first little project, we need a connection only to the PC. Maybe later we would like to connect an old GPS device to the 50g. As far as this is now clear to me.

(10-12-2016 01:38 PM)Claudio L. Wrote:  Finally, if you want to connect with other devices that can't provide power for the shifter, the cable from hpcalc.org's Eric was the only solution I know of that draws power from the calculator side to function. All others draw power from the other side (always assumed to be a PC).

But can you explain to me, why the level shifter can not simply supply with the power from the 50g?

Thank you and best regards,
Joerg