Hi Frank, Thanks for the reply ! The Digi Module actually sent and received data properly with the CS+ software using the similar setting as in the e2 studio. I actually hooked the tx and rx to a terminal on the PC instead of the Digi module, the data spit out were not correct. for testing purposes , I connected the RX directly to the TX, it turned out that the data in the received buffer were the exactly the same as what were transmitted in send buffer . Patrick
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