A13-OLinuXino-WIFI UEXT Modules MOD-RS232

[BT]

Hello,
I have A13-OLinuXino-WIFI with UEXT Modules MOD-RS232. I usage A13_debian_WIFI_GCC_GPIO_IN_OUT_X_I2C_100KHz_scratch_UVC_python_opencv_TS_7_release os. How to use Mod-Rs232. I listed /dev/tty* I see a lot of tty.

Thanks.