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Gibberish usually points to a baud-rate mismatch. Quite common. I'd be tempted to try Hyperterminal at some of the other baud rates - like 38400 and stuff.
And no, the 8n1n settings (8 bits, no parity, 1 stop, no flow) is pretty common among all the scantools. If you accidentally set the flow control to hardware, sometimes you'll get nothing because Hyperterm is waiting for a 'OK, send now' message.
Lukeyson
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