UART driver buffer sizes

We are developing a software for digi connectem/connectwiem boards. On these boards we are using a serial port 0 for other device interface where in the other device sends the data. UART driver is used for serial port 0. The os version we are using is NTT+OS 6.0. The problem we are facing is when the other device send data more than 32 bytes, the connectem/wiem board receives only 32 bytes and discards the other bytes. Is there a buffer restriction of 32 bytes in serial driver. Is is possible to set the buffer sizes. Please respond back to our question as this is very critical for our project.

Thanks,
Murali

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