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how to read a non printable ASCII character from a COM port.

cmdolcet used Ask the Experts™
I am trying to compare if my serial command ACK or NACK however I can;t seem to find a good way to compare my non printable value (ACK,NACK)

Can someone help out!

Thanks in advance
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Most Valuable Expert 2011
Top Expert 2015
Compare the byte received to:
CONST ACK As Byte = &H6


CONST NACK As Byte = &h15

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