HP50g - RS-232 cable

[Claudio L.]

(10-12-2016 08:42 AM)joeres Wrote:  Would not it be the simplest solution to use such a "USB to TTL Serial" module (e.g., https://www.sparkfun.com/products/9873)? USB port is connected to the notebook and the TTL serial port of the module is connected to the 50g.

Sorry for the one more question.
kind regards
Joerg

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. 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).