A5191HRT modem equivalent, hart modem.
* Single−chip, Half−duplex 1200 Bits per Second FSK Modem
* Bell 202 Shift Frequencies of 1200 Hz and 2200 Hz
* 3.0 V − 5.5 V Power Supply
* Transmit−sign.
* Compatible with 3.3 V or 5 V Microcontroller
* Internal Oscillator Requires 460.8 kHz Crystal or Ceramic Reson.
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