I have been trying to interface a zigbee device on my ixora v1.0 carrier board(Xbee pro s2b) which uses TTL level 3.3v .To use UART3 on TTL level ,i have removed JP3 and connected device on header x27 pin 27,28 .But still i am not able receive data.
Please test whether the UART you are using on Ixora is working fine.
Once done be careful about the naming conventions of the UARTS
As I can see in case of apalis T30
UART3 UART2/UARTB /dev/ttyHS1
UART4 UART3/UARTC /dev/ttyHS2 While on Ixora Carrier board:
Ixora Carrier Board
To use UART1 on the Ixora carrier board a regular 10 pin female IDC to 9-pin male D-Sub RS-232 serial cable adapter (e.g. as used for most former PC motherboards) on X22 is required.
To use the UART2 on the Ixora carrier board one can use the same regular RS-232 serial adapter from X22 on X21 as the RXD/TXD and RTS/CTS pins share the same connector layout.
To use UART3 on the Ixora carrier board one can use X21 pin 1 as UART3_RXD and pin 7 as UART3_TXD.
UART4 is only available as TTL level on the extension connector X27.