Reading Offset("Rdg Of"), Input Offset("Inp Of"), Or Output Offset("Out Of") - Omega DP41-B Series User Manual

10. Data Format Commands (P, G, R, W)
10.35 READING OFFSET ("RdG OF"), INPUT OFFSET ("INP OF"), or
OUTPUT OFFSET ("OUt OF")
These 3 ("09", "25" and "26" command suffixes) all use the same 3-byte (6-nibble or 6
character) format. The most significant bit is the sign bit, "=0" for a positive value, "=1"
for a negative value. The other 3 bits of the MSN are used for decimal point
(referenced to the right-hand display dp position) as given in the Table 10.29. The
remaining 5 nibbles (20 bits) are the magnitude (resolution one ppm).
Your data might be in the form of two data points (O2,I2 and O1,I1); since the meter
stores this information as separate scale and offset values, it is necessary to calculate
the offset:
OF = O1 - SC*I1,
where the scale factor SC is that calculated by the equation in Section 10.34.
In Table 10.29, "9" represents the maximum leading digit, and "x" is any desired
decimal.
Bit pattern information is as follows:
1) Bits 0 to 19 belong to the absolute value (99999 when value is negative and
999999 when value is positive).
2) Bits 20, 21, 22, belong to decimal point as shown in Table 10.29.
3) Bit number 20 is assigned to sign and is equal to "0" for positive and "1" for
negative values.
TABLE 10.29. READING OFFSET ("RdG OF"), INPUT OFFSET ("INP OF"), AND
OUTPUT OFFSET ("OUt OF"), BITS 22, 21 AND 20
BIT NUMBER
22
0
0
0
0
1
1
1
1
EXAMPLE: The computer requests the current display (reading) offset value from the
meter hex #15 with: *15G09<CR>.
DECIMAL
21 20 NUMBER
0 0 9xxxxx00.
0 1 9xxxxx0.
1 0 9xxxxx.0
1 1 9xxxx.x0
0 0 9xxx.xx0
0 1 9xx.xxx0
1 0 9x.xxxx0
1 1 9.xxxxx0
10-31
POWER OF 10
MULTIPLIER
2
1
0
-1
-2
-3
-4
-5