If memory serves, you had to buy an rs232 add on for the 440.
I don't think it is available anymore, but it consists of two chips. One is 
a binary counter, and I forget the other.
I'll go through my docs tonight and try and find them.

I ordered a couple of years ago, total cost around $20.  Much better than 
kenwood's last price.

Will try to be back with more info tomorrow.