SOLVED - Serial1.begin(57600) = 57.600 kHz ?

ted:
Post # 24 , USB wires - Tx, Rx,

USB doesn't have Tx or Rx wires, it's a differential pair usually labeled D+ and D- operating in a half duplex manner, that is, it may be host to peripheral or vice versa, but never both at the same time.

USB 101: An Introduction to Universal Serial Bus 2.0