ABB RVT Serie Instrucciones De Instalación Y De Funcionamiento página 587

data direction, and to avoid any computer dependent flow control. Missing to do so may
lead to force the user to work with a slower transmission speed.
An also important feature is the isolation between the RS-232 side and the RS-485 side
to avoid ground loops and to work safely.
Finally, port powered converters should be considered carefully as some computers
don't have sufficient power to feed efficiently the RS-232-RS-485 converter.
RS485 ç Appendices - 23