ONICON F-2600 - Manual (Page 84)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 84
Each range of register numbers maps to a unique range of addresses that are determined by
the function code and the register number. The address is equal to the least significant four
digits of the register number minus one, as shown in the following table.
Registers Function Codes Data Type and Address Range
00001-09999 01, 05, 15 Read/write bits 0000-9998
10001-19999 02 Read-only bits 0000-9998
30001-39999 03, 04 Read-only 16-bit registers 0000-9998
40001-49999 03, 06, 16 Read/write 16-bit registers 0000-9998
4.2.3 Register Definitions
The meter serial number and those variables that are commonly monitored (mass, volume
and energy flow rates, total, pressure, temperature, density, viscosity, Reynolds number,
and diagnostic variables such as frequency, velocity, gain, amplitude and filter setting) are
accessible via the Modbus protocol. Long integer and floating point numbers are accessed
as pairs of 16-bit registers in the register order selected in the Modbus Order menu.
Floating point numbers are formatted as single precision IEEE 754 floating point values.
The flow rate, temperature, pressure, and density variables may be accessed as either
the flow meter internal base units or in the user-programmed display units, which is
determined by the programming Output Menu’s “Modbus Units” item. The display units
strings may be examined by accessing their associated registers. Each of these units string
registers contain two characters of the string, and the strings may be two to 12 characters
in length with unused characters set to zero. Note that the byte order affects the order in
which the strings are transmitted. If the Modbus Order menu (see Section 4.2.2) is set to
0-1:2-3 or 2-3:0-1, then the characters are transmitted in the correct order. If set to 1-0:3-2
or 3-2:1-0, then each pair of characters will be transmitted in reverse order.