Basic Stamp serial communication

[Ian G]

We are trying to use a BASIC Stamp 2 px (BS2px) to preprocess Sonar data. I am not very familiar with stamps, but it is what we had on hand and interfaces well with the sonar units. So, making the Stamp and the RC talk to each other is stumping us. Using a TTL to serial adapter, we were able to make the RC send data to the stamp, but were unable to read a response. It is wired correctly, both are at the same Baud, and the code (which I do not have on hand at this moment to post, but will be happy to retrieve when I can) seems correct, at least on the C side of things.

I read somewhere that the BS2px relies on the device it is communicating with to provide the normally high voltage on the serial communication pin. Does the TTL board satisfy this? If not, would using a BS2 project board with a serial port, and connect it to the program port on the RC work? Thanks for any help. I am sorry if this post was hard to follow, you know how the day before ship is.