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Starting call and connecting to multiple PLCs with UnCmDrv1.dll

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Hello there, I'd like to know how to connect to PLC whe it's on listening mode with VB6 and how to connect with multiple listening PLCs with VB6 via GPRS?

I've done it with direct connections, it works fine, but when i use mEthServices. ----> there is only mEthServices.listen, no connect no nothing, help please

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