The FX-BACEOL-0 RS485 EOL Terminator is a non-smoke control listed component that provides EOL termination on FC bus segments when the device connected at the end of a bus segment does not have integral EOL termination capability.
The EOL terminator is a compact, lightweight, module wrapped in a protective cover, as shown in the following figure, that can be quickly installed in a variety of ways. The EOL connects directly to the terminating device on a bus segment with the attached wire leads. The EOL requires 24 VAC, Class 2 power supplied by the field device or other 24 VAC source.
An EOL terminator is required in all MS/TP applications wherever a terminating device on an FC bus segment does not have integral EOL termination (for example, TEC26xx Series thermostats). Some thermostats, such as the TEC3000 Series, have built-in EOL termination switches.
The EOL terminator is designed for FC buses and provides better bus performance than the integral EOL termination on third-party devices. An EOL is recommended wherever a third-party device terminates an FC bus segment. If the EOL terminator is connected to a third-party device that has integral EOL termination, the integral EOL termination on the third-party device must be disabled.