![]() MODEM contact output signal, data terminal ready, active low MODEM contact input signal, carrier detection, active low MODEM contact input signal, ringing indication, active low ![]() ①: The onboard 5V/3.3V can be selected by the jumper cap, or the jumper cap can be unplugged, and the external voltage input can also be used (2.5V/1.8V, except industrial grade).ĥV or 3.3V output for external device (configured by jumper) Mac OS, Linux, Windows 11 / 10 / 8.1 / 8 / 7, Android
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