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contact ohm might impact on voltage drop. try series with 0.1% resister rather than amp meter. than use meter measure voltage across it. reading fluctuate depand on load or instrumentation amp. refer to attachment
have install mscomm32.ocx and some *reg files and suscessful, an telephone icon have show in VCL in activeX , try to learn sent some binary(byte) code through comm port.
but return a invalid property value at "Mscomm1.Output:=tx; "
how to declare tx in mscomm by using variant ?, it seem like...
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