Yes
I try @C2 and @C3
the write address is @C2 and it works
for the READ I use both (to see what happens !)
because friends told me that they use @C2 and it works
they told me that PBP add 1 on the address value in a read command ?
That why I try both ...
May be my problem is that I am using a VIDEO sender done for 2400 Mhz range
and I use it on 2335 Mhz (amateur band) and the varicap level is low (near 1,15 volts)
I will try to set up on 2400 Mhz and see what happen ...

by the way, have you an idea about the Optionnal Label on I2C command
is it a GOTO or a GOSUB for you ?

thanks