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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 ow rate data, totalized ow 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.

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 oating 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

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

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

1 2 ... 6 7 8 9 10 11 12 13 14 15

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