... directly above equipment (e.g. heaters, transformers, inverters and equipment with large resistance) that generate lots of heat. • Do not use PORT1 (USB) in locations that are subject to vibration or impact. The USB connector is not provided with a locking function, so the USB cable may become loose or disconnected, and disrupt communications. a73 ... ±10% 50/60 Hz). This port is for connecting to a personal computer when writing or reading data to and from VT2 BUILDER. This port supports the RS-232C or RS-422A interface. This is used for connecting to a PLC or other external device. This port is for connecting the Keyence Corporation Barcode Reader BL-80RK/200 ...