monitor-251 in eval version.

I put the monitor-251 code in the target device, and connect to pc with a seiral-cable.
The connection is fail, and I check the monitor-251 code.
I find the monitor-251 is waiting for receiveing the data-byte(D6h) from PC.
But PC always send the data-byte(D7h), so the connection is always failed.

Could you tell me the monitor-251 of KeilC251 is usable or not?
Or there're some settings about PC or monitor-251 I should notice.

Thanks for your great help.

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