Operating Instructions

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Table Of Contents

Appendix D – RS-485 interface with Modbus protocol (RTU)

D.1 Prerequisites

Transmission parameter 1 stop bit, even parity

Transmission speed Factory setting: 9600

RS-485 interface protocol Modbus

D.2 "Read Holding Register" function (0x03)

number Type Value range

Factory

setting

Access

mode Unit

! Bus address 0000 unsigned word 1 … 255 1 R –

! Baud rate 0001 unsigned word 0 ➝ 9600

1 ➝ 38400

2 ➝ 57600

2 ➝ 115200

57600 R [Bit/s]

! – 0002

! Current flow

velocity

0003 unsigned word 0 … 15000 R [mm/s]

! Average flow

velocity

0004 unsigned word 0 … 15000 R [mm/s]

! Tilt anglel 0005 unsigned word 0 … 360 R [°]

! Internal filter

type

0006 unsigned word 0 ➝ IIR filter

1 ➝ Floating mean

1 R [1]

! Filter length 0007 unsigned word 1, 16 … 256 50 R [1]

! Flow direction 0008 unsigned word 0 ➝ Towards sensor

1 ➝ Away from sensor

R [1]

! Setting

Flow direction

0009 unsigned word 0 ➝ both

1 ➝ Towards sensor

2 ➝ Away from sensor

0 R [1]

! Measuring-

sensitivity

000A unsigned word 0 … 100 R [1]

! Signal intensity 000B unsigned word 0 … 2048 R [1]

! – 000C

! Firmware version 000D unsigned word 000 … 999 R –

! – 000E

! Gain factor 000F unsigned word 0 ➝ 1

1 ➝ 2

2 ➝ 5

3 ➝ 10

4 ➝ 20

5 ➝ 50

6 ➝ 100

7 ➝ 200

R [1]

! – 0010