Quote:
Originally posted by JasonS
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.
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I'm not familiar enough with the stamp to be sure of it's architecture, but I thought I'd post this anyway.
The DS75176B is a line transceiver, which converts from ttl levels (+5v) to line levels (+15v/-10v). It is an IC which must be connected to the stamp, not a module of any sort.
It requires logic lines other than the serial i/o to control it. Make sure you know what you're doing before you connect anything up, else the stamps may go poof.
Hope this helps.