B&B Electronics Switch RS-485 Manuel D’Utilisation
20
485SDA103798 Manual
B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Data Range
The data range of the A/D converter is determined by
A/D Ref Input+ and A/D Ref Input-. A/D Ref Input- sets the bottom
of the data range. Any input voltage that is less than or equal to the
A/D Ref Input- will be read as a zero. A/D Ref Input+ sets the top of
the data range. Any input voltage that is greater than or equal to the
A/D Ref Input+ will be read as a 1023 (3FFh). The data range is as
follows:
of the data range. Any input voltage that is less than or equal to the
A/D Ref Input- will be read as a zero. A/D Ref Input+ sets the top of
the data range. Any input voltage that is greater than or equal to the
A/D Ref Input+ will be read as a 1023 (3FFh). The data range is as
follows:
Data Range = (A/D Ref Input-) to (A/D Ref Input+)
Data Range = 0 to 1023
Data Range = 0 to 3FFh
Figure 4.1 shows the Data Range and A/D Ref Inputs relationship.
Figure 4.1 - A/D Converter Data Range
Converting Data
The data read from the 485SDA10 A/D converter is directly
related to the A/D input channel and the reference range (discussed
in previous sections). The 485SDA10 has a 10-bit A/D converter. A
10-bit A/D has 1024 possible output values, 0 to 1023 (0 to 3FFh).
These 1024 output values are divided into equal steps over the
reference range. The size of each step can be computed as follows:
in previous sections). The 485SDA10 has a 10-bit A/D converter. A
10-bit A/D has 1024 possible output values, 0 to 1023 (0 to 3FFh).
These 1024 output values are divided into equal steps over the
reference range. The size of each step can be computed as follows:
Step size = (Reference Range) / 1023