The iMX6 Rex module directly supports up to 3 UARTs. Additional serial ports can be done for example through USB to UART converter.
By default, the iMX6 Rex module supports full UART1 (RXD, TXD, CTS, RTS, DSR, DCD, DTR, RI) and the most important signals of UART2 (RXD, TXD, CTS, RTS). If not a full UART1 is required, the signals DSR, DTR, DCD and RI can be set as UART3 (see the schematic).
We have also tested USB to Serial port adaptor. Check out here >>
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