Baker Hughes Panametrics XMT686i, User Manual

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Chapter 1. Modbus Communications
6 Communications Options User’s Guide
512 RESERVED --- ---
*
The complete floating point value is constructed by combining readings from the first register with
a second register. An eight Hex digits number will represent the IEEE-754 hexadecimal floating point
value. 32-bit Hexadecimal Representation To Decimal Floating-Point conversion can be performed
if needed.
Example: Reg 14 reading is 44d7, Reg 15 reading is 4000, Mass Flow is 44d74000, which corresponds
to 1722.
**The complete Long integer value is constructed by combining readings from the first register with
the second register. Eight Hex digits will represent the Long integer value.
Example: Reg 24 is 0019, Reg 25 is ED30, Hexadecimal Sound Speed is 0019ED30, which is converted
to 1699120 decimal. Taking into account that Sound Speed has 3 decimal places (from the map), it
corresponds to a value of 1699.120.
Table 3: MODBUS Registers for a 2-Channel Gas Flowmeter
MODBUS Reg # Description
Scaling
(decimal places) Size in Bytes
1
1”
Clear Ch1 Totalizers” 
-- 2 (16 bit signed int)
2
1“
Clear Ch2 Totalizers”
-- 2 (16 bit signed int)
3, 4** Ch1 Velocity 2 4 (32 bit Long Integer)
5, 6*
2
Ch1 Act Volumetric
-- 4 (IEEE 32 bit Float)
7, 8*
2
Ch1 Std Volumetric
-- 4 (IEEE 32 bit Float)
9, 10**
3
Ch1 Fwd Totals
Register 13 4 (32 bit Long Integer)
11, 12**
3
Ch1 Rev Totals
Register 13 4 (32 bit Long Integer)
13 Ch1 #Tot Digits 0 2
14, 15*
2
Ch1 Mass Flow
-- 4 (IEEE 32 bit Float)
16, 17**
4
Ch1 Fwd Mass Totals
Register 20 4 (32 bit Long Integer)
18, 19**
4
Ch1 Rev Mass Totals
Register 20 4 (32 bit Long Integer)
20 Ch1 #MT DIGITS (Mass Tot Digits) 0 2
21, 22** Ch1 Timer 2 4 (32 bit Long Integer)
23
9
Ch1 Error Code
0 2
24, 25** Ch1 Sound Speed 3 4 (32 bit Long Integer)
26, 27**
10
Ch1 Density
4 4 (32 bit Long Integer)
28, 29** Ch1 Sig Strength Upstream 1 4 (32 bit Long Integer)
30, 31** Ch1 Sig Strength Downstream 1 4 (32 bit Long Integer)
32, 33** Ch1 Temperature 2 4 (32 bit Long Integer)
34, 35** Ch1 Pressure 3 4 (32 bit Long Integer)
36, 37** Ch2 Velocity 2 4 (32 bit Long Integer)
Table 2: MODBUS Registers for a 1-Channel Gas Flowmeter
MODBUS Reg # Description
Scaling
(decimal places) Size in Bytes