# Channel Input Connections (Physical)

Up to four signal inputs may optionally be connected to the product at the 8 point Terminal Strip P6, which is labeled "PHYSICAL INPUTS". Refer to the diagram,RTU INTERIOR VIEW. Connect each signal input to the points marked 1, 2, 3 or 4. Connect common returns (usually these are common grounds) to one or more of the points marked "C".

Any such signal inputs will be monitored as Physical Input channels, as opposed to Network Input channels. These physical input channels are assigned to the first four channel numbers by factory default. However you can change the channel number of the physical input channels, or not assign them any channel numbers, whenever you are configuring the product and depending upon your needs.

Terminal strip P6 may be unplugged for access convenience. All terminal points are screw clamp types, eliminating the need for wire termination lugs. The contact input wire should ideally be light (18 to 24 gauge) signal wire rather than heavy power wire. This reduces problems of bulk and stiffness.

Warning - In all cases, be sure that the contact inputs do not provide power of their own or the product will be damaged!

Exception - If your inputs are coming from a logic controller the TTL, CMOS or 5 VDC logic outputs, direct connection may be made as long as the controller has the same electrical ground as the product.