Open Interface FSK configuration

  1. Tumbler switch DTR/RTS on back side switch to ON
  2. Download EXTFSK and copy to you MMTTY directory
  3. in MMTTY setup select PTT&FSK Port as EXTFSK
  4. Misc tab settings TX Port select COM-TxD(FSK)
  5. and USB port options select C
  6. After press OK in setup open automaticaly EXTFSK window. Select FSK to DTR and PTT to RTS