Andy Dingley wrote:
On 11 July, 11:30, The Natural Philosopher
wrote:

Bear in mind you will have to use either no flow control or Xon/Xoff if
you only use three wires.

5, to get DTR/DSR, is better.

No, you use 5 wires with CTS/RTS as well. These control handshaking
at the character-by-character level, to avoid over-running buffers.

Muy bad. Been too long. You are of course completely correct.