use of second com port


I’m trying to develop a solution with a Digi Connect EM and i need to use the two serial ports in the device.

My problem is, i can read and write without trouble in the serial 1 (8 wires) but in the serial 2 (2 wires) I just can write.

Is needed some especial configuration in this port for use it?

I have declared the BSP_SERIAL_PORT_2 constant to BSP_SERIAL_UART_DRIVER and now the port is usable, but just for write.