Inline Coupler

A data bus coupler is a device used to connect one bus to another without any interruption. It functions as a breaker that couples and extends the bus while enabling bus monitoring. The stub connection is established using a coupling transformer and two fault isolation resistors. The coupler includes bus-in and bus-out connections, as well as at least one stub connection.

The purpose of the coupler is to reduce signal reflections and maintain proper signal impedance levels. Fault isolation resistors in the coupler provide protection for the main bus in the event of a short circuit in the stub. All devices, including the bus controller, bus monitor, and remote terminal, must be connected to the stub ends of the coupler.