CR1000 Manual - Campbell Scientific

Appendix E. FP2 Data Format
FP2 data are two-byte big-endian values. Representing bits in each byte pair as
ABCDEFGH IJKLMNOP, bits are described in table FP2 Data-Format Bit
Descriptions (p. 557).
Table 126. FP2 Data-Format Bit Descriptions
Bit
Description
A Polarity, 0 = +, 1 = –
B, C Decimal locaters as defined in the table FP2 Decimal Locater Bits.
D - P
13-bit binary value, D being the MSB (p. 204). Largest 13-bit magnitude is 8191, but
Campbell Scientific defines the largest-allowable magnitude as 7999
Decimal locaters can be viewed as a negative base-10 exponent with decimal
locations as shown in table FP2 Decimal-Locater Bits (p. 557).
Table 127. FP2 Decimal-
Locater Bits
B C Decimal Location
0 0 XXXX.
0 1 XXX.X
1 0 XX.XX
1 1 X.XXX
557