Denso BHT-7500W, BHT-7500S user manual 143

Chapter 3. Communications Operations of the BHT

■Data Text Format

(1) Heading text

																	Number of fields
																	(2 bytes)					Length of
																						data field 1			Length of
																						(3 bytes)			data field n
Byte																									(3 bytes)
position	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18		19	20	21	22
				Data file name									Number of data
													texts contained
				(12 bytes)
													(5 bytes)
Example of																									2
	M	A	S	T	E	R .		D	A	T			0	0	5	9	2		n		0	0		6		5	4
contents

The data file name should be a maximum of 12 characters in length and it consists of FILE NAME and

.EXTENSION. The FILE NAME should be 1 to 8 characters. The EXTENSION should be other than .PD3, .EX3, and

.FN3, and it may be omitted (together with a period).

The number of data	Every data field
texts should be 0 to	should be 1 to 254
32767. If it is less than 5	digits in length. If it is
digits, the upper blank	less than 3 digits, the
bytes will be filled with	upper blank bytes will
zeros (0).	be filled with zeros (0).

The number of fields should be 1 to 16. If it is less than 2 digits, the upper blank byte will be filled with zero (0).

If the data file name is less than 12 characters in length, the lower blank bytes will be filled with space characters.

(2) Data text

		Data field 1		Data field 2	Data field n
Example of	T 1 0 0 9		1 S 1 2 3		9 2 0 2 1 4 1 3 2 5
contents

Every data field should be 1 to 254 digits in length.

If a data field is less than the maximum digits in length, the lower blank bytes will be filled with space characters.

The total length of all data fields plus the number of the character count bytes (= the number of the fields) should be 255 bytes or less.

When you transfer five 50-digit (50-byte) fields, for example, the total length of all data fields is 250 (50 x 5) bytes and the number of the character count bytes is 5. Accordingly, the total is 255, so you can transfer the file.

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