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Harald Welte laforge at gnumonks.orgOn Fri, Feb 04, 2011 at 12:47:50AM +0100, labad jala wrote: > I am new to the list and I acquired a c139. I'd like to buy a rs232/jack > 2,5mm named t191 flash (and not unlock) cable. They look 100% the same (even > stickers). Is this important? I understand that I have also to use a > rs232/usb adapter. The one I have (U232P9 with link/tx/rx leds) gives +/-9,4 > v. So my concern is to not fry the Moto..Any advise welcome. if you put a usb/rs232 converter and then a rs232/2.5mm cable behind each other, there should be no problem, at least not voltage-wise. The usb/rs232 converter cable with DB-9 will up-convert to +/- 9V, and the T191 cable with DB-9 will then down-convert again to 3.3V In case of any doubt, simply use a multimeter to verify. RS323 is low-active, i.e. in idle state the lines are at their highest voltage. Regards, Harald -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)