Data Bus Coupler

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

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