Hello I never got it to work reliably so I am using omni-rig now, It works ok. Only from time to time it does not close when I close varac and then it blocks the com port from other applications and I have to manually find it and shut it down. I did try a lot with the built in cat control and tried all sorts of settings but never got it to work 100%. If you do manage to get it to work please share :-) I think this was the last I tried with parity "Mark" [Icom IC-735] CmdType=HEX ModeUSB=FEFE04E00601FD, ModeUSB_D=FEFE04E00604FD, ModeFM=FEFE04E00605FD, SetFreq_Data_method=BCD SetFreqVfoA_Cmd=FEFE04E005{}FD SetFreqVfoA_param_length=8 SetFreqVfoA_hz_res=1 ReadFreqVfoA_Cmd=FEFE04E003FD ReadFreqVfoA_Result_Data_method=BCD ReadFreqVfoA_Result_hz_res=1 ReadFreqVfoA_Result_Length=20 ReadFreqVfoA_Result_Freq_Start_Pos=7 ReadFreqVfoA_Result_Freq_Length=8

This is with ReadFreqVfoA_Result_Freq_Start_Pos=11 (Sorry for swe) 24/10/2022 06:57:50 - Cat command (HEX): FEFE04E003FD 24/10/2022 06:57:50 - Writing to com port 24/10/2022 06:57:50 - CAT cmd result: fee0040300501014fdfefe04e003fdfe 24/10/2022 06:57:50 - CAT result after echo stripping: fee0040300501014fdfe 24/10/2022 06:57:50 - Error: Unable to read frequency from CAT command: Indatasträngen hade ett felaktigt format. vid System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) vid System.Number.ParseInt64(String value, NumberStyles options, NumberFormatInfo numfmt) vid System.Convert.ToInt64(String value) vid VarAC.VarAC.FromBcd(String value, String endian) vid VarAC.VarAC.convert_freq_from_read_cmd(String freq, String data_method, Single freq_hz_res) vid VarAC.VarAC.<>c__DisplayClass539_0.b__0() This is with ReadFreqVfoA_Result_Freq_Start_Pos=7 It behaves strange, for ex. if I am at 14.105.000, closes the program and starts it again, it miss reads the info received from the radio as 10.050.300 as it somehow gets wrong result, and changes the radio frequency to 10.050.300 24/10/2022 06:46:20 - Cat command (HEX): FEFE04E003FD 24/10/2022 06:46:20 - Writing to com port 24/10/2022 06:46:20 - Starting write_command_stream_log 24/10/2022 06:46:20 - Writing event to command stream log 24/10/2022 06:46:20 - End of write_command_stream_log 24/10/2022 06:46:20 - CAT cmd result: fee0040300501014fdfefe04e003fdfe 24/10/2022 06:46:20 - CAT result after echo stripping: fee0040300501014fdfe 24/10/2022 06:46:20 - Frequency converted value:10500003 24/10/2022 06:46:20 - CAT Read frequency: 03005010 10500003 24/10/2022 06:46:20 - Change combobox freq text to: 10.500.003 then via the drop box I change back to 14.105.00 it gets another result from the cat command 24/10/2022 06:46:24 - Cat command (HEX): FEFE04E003FD 24/10/2022 06:46:24 - Writing to com port 24/10/2022 06:46:24 - CAT cmd result: e0040300501014fdfefe04e003fdfefe 24/10/2022 06:46:24 - CAT result after echo stripping: e0040300501014fdfefe 24/10/2022 06:46:24 - Frequency converted value:14105000 24/10/2022 06:46:24 - CAT Read frequency: 00501014 14105000 24/10/2022 06:46:24 - Change combobox freq text to: 14.105.000 24/10/2022 06:46:26 - Cat command (HEX): FEFE04E003FD 24/10/2022 06:46:26 - Writing to com port 24/10/2022 06:46:26 - CAT cmd result: e0040300501014fdfefe04e003fdfefe 24/10/2022 06:46:26 - CAT result after echo stripping: e0040300501014fdfefe 24/10/2022 06:46:26 - Frequency converted value:14105000 24/10/2022 06:46:26 - CAT Read frequency: 00501014 14105000 24/10/2022 06:46:28 - Cat command (HEX): FEFE04E003FD 24/10/2022 06:46:28 - Writing to com port 24/10/2022 06:46:28 - CAT cmd result: e0040300501014fdfefe04e003fdfe 24/10/2022 06:46:28 - CAT result after echo stripping: e0040300501014fdfe 24/10/2022 06:46:30 - Changing frequency: user selection from dropdown menu. 24/10/2022 06:46:30 - Frequency converted value:00501014 24/10/2022 06:46:30 - Cat command (HEX): FEFE04E00601FD 24/10/2022 06:46:30 - Writing to com port 24/10/2022 06:46:30 - Cat command (HEX): 24/10/2022 06:46:30 - Writing to com port 24/10/2022 06:46:30 - CAT cmd result: fee004fbfd 24/10/2022 06:46:30 - Cat command (HEX): FEFE04E00500501014FD 24/10/2022 06:46:30 - Writing to com port 24/10/2022 06:46:30 - CAT cmd result: fefe04e00500501014fd 24/10/2022 06:46:30 - Change combobox freq text to: 14.105.000 24/10/2022 06:46:30 - Change combobox freq color 24/10/2022 06:46:31 - Change combobox freq color 24/10/2022 06:46:32 - Cat command (HEX): FEFE04E003FD 24/10/2022 06:46:32 - Writing to com port 24/10/2022 06:46:32 - CAT cmd result: fefee004fbfdfefe04e003fdfefe 24/10/2022 06:46:32 - CAT result after echo stripping: fefee004fbfdfefe 24/10/2022 06:46:32 - Change combobox freq color

I agree, It seams strange, I put it down to my cat cable or something, I also get different results with debug mode on or off and I need to use parity "Mark" to get it to work. and to confirm yes I must use ReadFreqVfoA_Result_Freq_Start_Pos=7 I might go with omni-rig as it seams more stable.

And the ReadFreqVfoA_Result_Freq_Start_Pos=11 is 7. The cat control of my radio (IC 735) is not 100% not specific to VaraC but Overall.

I got it, the mode line has to end in a comma , all good.

I did have to remove the MODE... lines in my setup

Nice this looks complete, Thanx!