USB to serial chip CH340
high-level. If R232 is high-level, use assistant RS232 function, then RXD pin automatically inserts a inverter internal, and low-level is in default. When serial interface output is free, the TXD in CH340H and CH340T is high level, TXD in CH340R is low-level. MODEM liaison signal pin contains: CTS#, DSR#, RI#, DCD# and RTS#. All these MODEM liaison
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