If the current RTS state cannot be retrieved, this property returns
nil
Port.rts read/write property
Sets/gets the "Request To Send" mode of the serial port, using the following possible values :
"on"
: RTS signal is always active"off"
: RTS signal stays inactive"handshake"
: RTS signal is used for hardware handshaking"toogle"
: RTS signal toggles between ready and not ready states