Actually I think you can just use a 232 to 422 converter (part # DS75176B, $1.06ea. I believe) to allow the stamp to talk with the modems. You are right though, the stamp cannot talk directly with the modem...sorry, I should have clarified that. I would like to use the 422s because I have them and it would cost me virtually nothing, whereas the 232 modems would cost significantly more than I have.

Thanks!