Abstract: A telemetry system adapter for connecting a recording station to a telemetry system having a plurality of data acquisition array terminals serially connected together by cables. The adapter may be used to connect the recording station to any array terminal in the telemetry system. At the array terminal to which it is desired to connect the recording station, the cable is disconnected from the array terminal and connected to one connector of the adapter. Another connector of the adapter is connected to the array terminal, and a third connector of the adapter is connected to the recording station. The connectors on the adapter will fit only a respective one of the array terminal connectors, the cable connector or the recording station connector, and therefore cannot be attached incorrectly. The adapter may include an attenuator for balancing data levels and reducing cross-talk interference.