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USB Power
If you have the 5V version of the USB-TTL cable, the TTL-232R-5V,
you can optionally configure the kit to get power from USB. To do
so, add a jumper between locations “Vcc2” and “USB5V” on the
board.
Caution!
If you make this modification, hooking up to a USB
connector will provide power to the board. So, you
must not
hook
up both the regular power supply and the USB-TTL cable at the
same time. (One will win; damage to your power supply, clock, or
computer is likely to result. So don’t do it.)
[Bulbdial Guide]