[R] Update dataframe to Access without delete values

[cindy.dol]

Hi! 
I created a table named "TEST2" in my base Access named "CINDY". 
My columns are : "A" (numeric), "B" (character), "C" (numeric) 
There are values in this table. 

In R, I created a data.frame fr: 
fr <- data.frame(A = c(1,2,3),B = c("c","d","u"), C=c(4,5,6)) 
I would like export this data.frame in my table TEST2 without delete the
values which are inside. 

I tried : 
sqlUpdate(CINDY, fr, 'TEST2',index=colnames(fr)) 

But it doesn't work... 

Can you help me please? 
Thanks 

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