Changes the RTS(Request To Send) status of Tera Term. (version 4.59 or later)
If the connection is not serial connection or flow control is not "none", this command will do nothing.
If <echo flag> is zero, the RTS is turned off.
If <echo flag> is non-zero, the RTS is turned on.
; RTS on setrts 1 ; RTS off setrts 0