[Elecraft] Elecraft KX3 Owner's Manual nowavailable(*preliminary*)

[Jim Brown]

On 3/5/2012 12:58 PM, Oliver Dröse wrote:
> you should*NOT*  apply RTS directly to the GPIO pin! RS-232 levels go up
> into the ±20 volts region per specs

Not in recent recorded history!  So-called RS-232 interfaces started 
getting cheapened many years ago (before they went away and were 
replaced by USB), and one of the first things to go was output voltage 
swing. Think about the voltages available in a laptop, for example. I'd 
be very surprised to see more than 10-12V on anything other than an 
industrial RS232 interface, and less  on most laptops.

73, Jim K9YC