Ingersoll-Rand CENTAC, Technical Reference Manual

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98
CMC TECHNICAL REFERENCE MANUAL
1X36003 Version 2.52

1996-1999 Ingersoll-Rand Company
Date of Issue: 18-Oct-1999
Register 1 is the Integer portion of the System Pressure or (0064h, 100 decimal). Register 2
is the Fraction portion of the System Pressure or (134Eh, 4942 decimal). Each fraction has
a range between 0 and 9999. So the System Pressure, expressed as a floating point
number is 100.4942 psi.
Example: Read Single Channel IEEE 32-Bit Floating Point Number
To continue with the example, when you decide to get the System Pressure as an IEEE 32
Bit floating point number you must issue the following command:
The response from this command is:
So the System Pressure, expressed as a floating point number is 110.4155731201 psi.
IEEE floating point numbers are represented in 32 bits as shown below.
Convert hexadecimal registers 1 and 2 (Reg-1, Reg-2) into decimal values ...
Number of
Device Function Address Registers CRC
Address Code Hi Lo Hi Lo Lo Hi
01 04 0B BE 00 02 13 CB
Data
Device Function Byte Reg-1 Reg-2 CRC
Address Code Count Hi Lo Hi Lo Lo Hi
01 04 04 42 DC D4 C6 F1 54
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7
6
5 4 3 2 1 0
exponent mantissa
sign
Register Byte Symbol Hex Decimal
1 Hi R1HB 42 66
1 Lo R1LB DC 220
2 Hi R2HB D4 212
2 Lo R2LB C6 198