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> Rs232 To Rs485 Pleased Help
anhnha
Posted: April 25, 2012 10:19 am
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I have built a rs232-rs485 to trnsfer data between 2 computers but i run into a problem that when i connected GND of comm port to negative of power supply I can not reciived data.However, when GND is removed and I can received data even the power supply is removed.Would you help me what is happen?Do i really need to tied GND of comm port to negative of power supply?
this is my schematic:
http://forum.allaboutcircuits.com/attachme...43&d=1335245416

This post has been edited by anhnha on April 25, 2012 10:30 am
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