Ingersoll-Rand CENTAC, Техническое справочное руководство

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104
CMC TECHNICAL REFERENCE MANUAL
1X36003 Version 2.52

1996-1999 Ingersoll-Rand Company
Date of Issue: 18-Oct-1999
It took us six iterations to get the result to a number that is less than two and greater than or
equal to one. Now, we must add 127 for an exponent of
133. Converting this to binary, the next eight bits are
represented as
10000101 .
3. Determine the mantissa bits by
From the table at right, 0100101100110011001100
represent the next 23 bits.
4. Combining the bits in sign, exponent and then
mantissa order ...
0100-0010-1101-0010-1100-1100-1100-1100
This converts to 42-D2-CC-CC in hexadecimal.
To change the holding registers for user pressure
setpoint (for 32 bit IEEE floating point numbers the
absolute address is 43269, relative address 0C-C4) to
105.4, issue the following command...
The response from this command is similar to the command sent except that the number of
data bytes and the data bytes themselves are not echoed:
NOTE
Sending 32 bit values are typically not necessary. Sending the data as a 16 bit integer
only or a 16 bit integer and 16 bit fraction will satisfy most requirements. Some
systems have 32 bit capability built directly into their products. We have provided this
feature for those systems.
Iteration Decimal Operati
on
Result Bit
1 1.646875 - 1 * 2 = 1.29375 1
2 1.29375 - 1 * 2 = 0.5875 0
3 0.5875 * 2 = 1.175 1
4 1.175 - 1 * 2 = 0.35 0
5 0.35 * 2 = 0.7 0
6 0.7 * 2 = 1.4 1
7 1.4 - 1 * 2 = 0.8 0
8 0.8 * 2 = 1.6 1
9 1.6 - 1 * 2 = 1.2 1
10 1.2 - 1 * 2 = 0.4 0
11 0.4 * 2 = 0.8 0
12 0.8 * 2 = 1.6 1
13 1.6 - 1 * 2 = 1.2 1
14 1.2 - 1 * 2 = 0.4 0
15 0.4 * 2 = 0.8 0
16 0.8 * 2 = 1.6 1
17 1.6 - 1 * 2 = 1.2 1
18 1.2 - 1 * 2 = 0.4 0
19 0.4 * 2 = 0.8 0
20 0.8 * 2 = 1.6 1
21 1.6 - 1 * 2 = 1.2 1
22 1.2 - 1 * 2 = 0.4 0
23 0.4 * 2 = 0.8 0
Device Functio
n
Address
Number of
Registers
Numbe
r
of Data
Data Bytes
for Register
#1
Data Bytes
for Register
#2
CRC
Address Code Hi Lo Hi Lo Bytes Hi Lo Hi Lo Lo Hi
01 10 0C C4 00 02 04 42 D2 CC CC 4A 18
Number of
Device Function Address Registers CRC
Address Code Hi Lo Hi Lo Lo Hi
01 10 0C C4 00 02 03 65