The HamLinkUSB™ Rig Controller Plus is compatible with most soundcard and software control programs, such as PK-Term (ROC). The PTT version of the HamLinkUSB Rig Controller Plus has a RTS output with a driver transistor to operate a PTT line from most sound card programs. Other versions have DTR/transistor outputs to drive electronic keyers and general purpose outputs for user-determined purposes. Another version has a logic level input to detect external switches such as foot switches.
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