Specifications

128
8.2.3 Structure of Data Files
■ Record
A data file is made up of a maximum of 32767 records. A record is a set of data in a data
file and its format is defined by the
FIELD statement. The maximum length of a record is
255 bytes including the number of the character count bytes* (= the number of the fields).
* When transferring data files, the BHT-protocol/BHT-Ir protocol automatically prefixes a character
count byte in binary format to each data field.
■ Field
A record is made up of 1 to 16 fields. Data within the fields will be treated as character
(ASCII) data.
Each field precedes a character count byte in binary format, as described above. Including
that one byte, the maximum length of a field is 255 bytes.
The following
FIELD statement defines a record which occupies a 28-byte memory area
(13 + 5 + 10 bytes) for data and a 3-byte memory area for three character count bytes.
Totally, this record occupies not a 28-byte area but a 31-byte area in the memory.
FIELD #2,13 AS bardat$,5 AS keydat$,10 AS dt$
’1+13+1+5+1+10=31 bytes
When a data file is transmitted according to the BHT-protocol, the following conditions
should be also satisfied:
• The maximum length of a field is 254 bytes excluding a character count byte.