+-------+--------+
buf -->  |    0  | Status |
         +-------+--------+
         |   Frame Size   |
         +----------------+
         |     Space      |
         +---          ---+
         |      for       |
         +---          ---+
         |     up to      |
         +---          ---+
         |      757       |
         +---          ---+
         |     Decimal    |
         +---          ---+
         |     Words      |
         +---          ---+
         .                .
         .                .
         .                .
         +----------------+