Advantech ADAM-5511 Manual page 104

With the ADAM-5090 you can implement dual communication
channels between your PC and the ADAM system. Even when one of
the two communication channels is down, your system can still
function through the alternative communication channel. This dual
communication channels can be implemented by application software.
4 RS232
ADAM-5090
TX
Port1
RX
TX
Port2
RX
TX
Port3
RX
TX
Port4
RX
4 RS232
ADAM-5090
Port1
Port2
Port3
Port4
RJ 48
Communication Cable
TX
RX
TX
RX
TX
RX
TX
RX
DB9
RS-232 Device