A portable communicator for use in a process control system. In the illustrative embodiment, the ECC matrix has an odd number of bits set in each row thereof. The system and method also include a level sensor for monitoring a liquid level in a reservoir. The secondary test computer maps the input data according to the format required by its associated secondary test computer. Also provided herein are vectors and host cells comprising those nucleic acid sequences, chimeric polypeptide molecules comprising the polypeptides of the present invention fused to heterologous polypeptide sequences, antibodies which bind to the polypeptides of the present invention and to methods for producing the polypeptides of the present invention.