Серийный Can't receive port датирует on 14.04

гm attempting to использовал в сериал port testing procedure documented in the соединение below that используй minicom, в null модем кабель, and two ubuntu 14.04 machines with the кабель connected to/dev/ttyS0 on both machines. I get не errors during the procedure however, одиннадцать connected, I see не датирует echoed in either minicom терминал.

I get the same issue when attempting to использовал the Java Serialio.com libraries. Не errors occur during connection or transmit, however он не восходит is received on the opposite port. I did notice that the transmit буфер was filling but not being emptied.

I see не errors in syslogd.

Thanks for any help in advance.

http://linux.koolsolutions.com/2008/04/10/how-to-test-serial-ports-under-debian-linux/