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PDA Extension

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i’m searching for an extension to PDA’s which allows me to connect to two different RS232 ports via the Mini-USB Port(no Host ability!!!). One of these ports should permanently send its signal. If the other one signals its willingsness to send data, the modul must recognize, switch to this dataline and transfer data until there is nothing more to send – afterwards, the first datachannel has to be selected again until number two signals again that there is data to send and so on… - any ideas!?

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It is more easy used a bluetooth rs-232 module. Have some modules in electronic stores. Look this in google.

Best regards.

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