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Two way communcation with the serial port (modem to modem)

 
Changchin Ho
Greenhorn
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Hi,
I used rxtx example(TwoWaySerialComm.java) to open modem in A and B. A use at command connect to B by modem.
B can send text to A and B's text display in A's console after connected, but A can't send text to B. I don't know why.
Does anybody know?

http://rxtx.qbang.org/wiki/index.php/Two_way_communcation_with_the_serial_port




Thanks for your help.
Rick
 
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