Hi, Could anyone help me, I am unable to communicate with the PLC. I'm using a serial USB converter like this:   https://www.google.com/search?q=usb+rs232+adaptor&source=lnms&tbm=isch&sa=X&ei=D3tiVe2PJcOMNsGHgdAO&ved=0CAgQ_AUoAg&biw=1366&bih=604#imgrc=j5rYmCAdj4P5nM%253A%3BPoOL6YxHsvuK1M%3Bhttp%253A%252F%252Fwww.tienda.siliceo.es%252Fimages%252FSerial_cable_serie_USB_UART_TTL_GPS_FTA_1.jpg%3Bhttp%253A%252F%252Fwww.tienda.siliceo.es%252Fcable-serie-usb-rs232-uart-tt