Connecting many UART sensors to xPC target

I use 8 inertial sensors that should be connected to the xPC target machine. The sensors output format is TTL level UART (0-3.3V). I can use a RS-232 driver to convert it and connect via serial ports but it would be more convenient to use an IO board that already supports UART TTL.

Are there any of such boards supported by xPC Target?

Thanks Eduardo