DRL or Maxon Radios purchased from Campbell Scientific include a cable to connect the radio to its modem. This rainbow-colored cable includes a 10-pin rectangular connector to which a PTT (Push-To-Talk) Button can be attached. This button (part number 13855) is used to trigger a brief transmission by the radio which can assist in verifying operation of each RF transceiver in a system.

It is intended as a short-term diagnostic tool to optimize RF performance and should not remain connected.

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