... can switch between cameras freely, control the Auto/manual, set parameters and lens. Multi-protocol support ... Support the RS232 and RS485, RS232 hardware installation is selectable.3). Multiple language display.4). ... , or off delay3 .Technique detailCommunication: PTZ, DVR double groups individual RS485 communication link (PORT1), ... Power, RJ45 junction box, line, manual. PTZ and DVR Control Keyboard