| 摘要 |
For the electrically isolated transmission of digital signals, an isolating path (IP) of the channel formed by means of a transformer is used. The channel further comprises a conversion stage (SC1) for converting the digital signal (txd1) to a transmissible coupling signal (txt1) and a conversion stage (SC2) for converting a coupling signal (rxt2) to the digital signal (rxd2). This conversion is accomplished by means of a monostable multivibrator. The coupling signal (txt1) is a square-wave voltage (AU2) which is generated by means of a delay circuit (4) in the conversion stage (SC1) and is converted on the isolating path (IP) to a square-wave voltage (AU3) serving as the coupling signal (rxt2). Furthermore, the direction of transmission is switchable in operation by means of activatable digital-signal ports (TXD1', RXD2', TXD2', RXD1') of the channel. The activation is effected by means of selection signals (rxa1', rxa2'). When no signal is being transmitted, the channel is in a defined initial state. The channel has low power consumption and the transmitted signal is highly immune to electromagnetic interference.
|
