Ring Indicate. An RS232 input line that is generally held high by a modem while the telephone is ringing.

振铃提醒，某个RS232输入，通常在电话振铃的时候拥有较高的响应。

youdao

Ring Indicate. An RS232 input line that is generally held high by a modem while the telephone is ringing.

振铃提醒，某个RS232输入，通常在电话振铃的时候拥有较高的响应。

youdao