ONICON F-5100 MOD Network - Manual (Page 11)

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F-5100-MOD Flow Meter Network Interface Installation Guide 05/14 - 0669-6
Page 11
SECTION 2.0: MODBUS MEMORY MAP
ONICON F-5100 Thermal Mass Flow Meters provide flow rate data, totalized flow data, temperature
and zero calibration data via the MODBUS RTU RS485 serial communications interface. MODBUS data
is available in the same engineering units shown on the meter’s display.
Network addressing, Baud rate and parity are also set via MODBUS registers. Refer to the preceding
section for more information on changing these register values.
2.1 MODBUS REGISTER FORMAT AND NETWORKING INFORMATION
All registers are 16 bit MODBUS Holding Registers.
Register address 001 corresponds to memory location 000.
Registers with 200 series addresses are 16 bit unsigned integers.
Registers with 300 series addresses are unsigned 32 bit long integer values
Registers with 500 series addresses are (IEEE754) 32 bit single precision floating point values.
Registers with 800 series addresses are scaled unsigned 32 bit long integer values
MODBUS function codes supported:
Code Description
03
Read Holding Registers
16 Write Multiple Registers
17 Report Slave ID
REGISTER
ADDRESS
DESCRIPTION REGISTER
RANGE
DATA
RANGE
OVER
RANGE
READ/WRITE COMMENT
349 Baud Rate &
Parity
0 - 65535 0 - 5 Not
Applicable
Read / Write See Section
1.5.1
REGISTER
ADDRESS
DESCRIPTION REGISTER
RANGE
DATA
RANGE
OVER
RANGE
READ/WRITE COMMENT
257 Device Address 0 - 65535 01 - 240 Not
Applicable
Read / Write See Section
1.6.1