S spwanch Distinguished Sep 5, 2009 1 0 18,510 Sep 5, 2009 #1 Does anybody know if an external RS-232 serial modem will work with only 3 pins (Tx, Rx, Gnd) implemented on the serial interface? If yes, will modem features like auto-answer work even though the ring indicator line isn't implemented?
Does anybody know if an external RS-232 serial modem will work with only 3 pins (Tx, Rx, Gnd) implemented on the serial interface? If yes, will modem features like auto-answer work even though the ring indicator line isn't implemented?
G GhislainG Titan Jul 16, 2008 23,962 5 74,965 Sep 6, 2009 #2 No. You need other signals like CTS, RTS, DCD, etc. Having Tx, Rx and Gnd is not an RS-232 standard.