I used the command with id 0x05 from the manual for ZR10. I have already found a solution in another forum thread. Now I use the command with id 0x18 from ZT30 manual to get the current zoom value. Please update the manual for ZR10, because currently the protocol described in it does not correspond to reality. In addition to the “Manual zoom” command (0x05), the “Autofocus” command (0x04) is incorrectly described because it has two additional parameters in its body.