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i am working on a project which needs pc to plc communication through vb6.i had mscomm control in vb by using its oncom event but it did'nt worked out.i had checked the communication terminals using a multimeter which shows a costant voltage of 30v. does it require any handshaking to start the communication.i had also tried to get data by hyperterminal but no use.can anybody e-mail me the sample code necessary for this purpose.