Re: [Hamlib-developer] ICOM7300 MKII failed comms issue

[George B. <geo...@gm...>]

With a quick look through the WSJT-X_RigControl.log, I see that your rig 
is responding as if it were an IC-7300; it is answering commands 
beginning with 0xfe 0xfe 0x94 0xe0. The 0x94 is the default CI-V address 
for an IC-7300.  When you change the model to IC-7300MK2, Hamlib 
switches to sending 0xfe 0xfe 0xb6 0xe0 , where 0xb6 is the default for 
the new model. That's when you get the timeout.

If you have changed that for connecting as an IC-7300(Hamlib pre-4.7.0 
or other software), change it back. Or, if WSJT-X allows it, change the 
CI-V address it sends to 0x94, and see if that works.  As a last resort, 
you could do a reset of the rig and see which address it defaults to.

HTH

73 n3gb

On 5/11/26 12:02 AM, Jim Ewald wrote:
> ham...@li...
>
> Hello,
>
> I am using  WSJT-X Improved v3.1.0-260418 with HamLib versions 
> 4.7.2-rc 202605-06 and 4.7.1 2026-04-15. My radio is an Icom 7300 MkII 
> running firmware version 1.02
>
> If I set the radio selection to Icom 7300, everything appears to work 
> as expected. However, if I change the radio selector to Icom 7300 
> MkII, I see a communications error listed below. If I revert to the 
> Icom 7300 selection, the app begins working as expected again. No 
> other settings on the radio tab were changed. It is using COM6 at 
> 19200 baud.
>
> I have included the diagnostic files from the WSJT-X. The app starts 
> with the Icom 7300 radio configuration; I then navigate to 
> File->Settings and select the Radio tab. I then change the radio 
> selected to Icom 7300 MkII and then click on the Test CAT button. The 
> error below appears. I then closed the app and collected the 
> diagnostic files.
>
> Please let me know if there is anything else you need from me or 
> anything you would like me to test.
>
> Regards,
>
> Jim Ewald
> N7ZFI
>
> image.png
>
>
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