Using the SX28 Plug on the PDB to House a BS2

Unable to bear the thought of throwing away a perfectly good BASIC Stamp 2 for cause of broken pins, I decided to make a custom adapter to fit the thing into the SX28 plug on my PDB. Currently, I have half of the I/O done, along with power and reset.
My question: How do I wire up the RS-232 DCE on the bottom of my PDB? I know it has Rx/Tx, which are included in the BS2 programming connection. Are there any pins on it which correspond to DTR?
The greatest thing about logic is that, once you have followed the thought train, it is then your own.

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