| 摘要 |
The input interface for a transmit/receive radio station includes an input for receiving a signal either with a variable voltage over a pre-determined voltage range, or an open collector signal having a voltage (0V) corresponding to the low logic state; a first output for the variable voltage signal, and a second open collector output. The first and second outputs are connected to the same input and the input is connected to a reference potential through a first voltage divider bridge, the middle point of which is connected to the positive terminal of an open loop comparator, the output of which is connected to the second output. |
