First isolate the problem by running a loopback test of the RS-232/USB converter only, by shorting pins 2 & 3.
Any character typed in Hyperterminal should echo back at any BAUD rate, parity, flow control, etc, settings.
Reference the Loopback guides below for further details:
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If your RS-232/USB Converter appears to function correctly. The issue is most likely the default settings of the RFID Reader. Also check for software or hardware flow control.
BigDog