Sonic Driver Modbus-UFM WALL-UFM Modbus RTU Slave Meter Instruction Manual

June 12, 2024
Sonic Driver

Sonic Driver Modbus-UFM WALL-UFM Modbus RTU Slave Meter

Product Information

Product Name: MODBUS WALL-UFM, Modbus RTU Slave Meter
Version: 2.1
Manufacturer: Sonic Driver Ltd
Copyright: 2023
Country of Origin: Made in Britain

Introduction
The MODBUS WALL-UFM is a Modbus RTU Slave Meter designed for various applications. It supports communication via RS485 and ballows users to interact with the meter using Modbus commands.

Mode
The meter operates in Modbus RTU mode.

Baud rate
The RS485 baud rate is set to 19200.

Parity
The RS485 parity is set to Even.

Stop Bits
The RS485 stop bits are set to 1.

Modbus Address
The Modbus-UFM Slave address is programmable and can be set from 1 to 255. The default Slave address is 1.

Data bits
The RS485 serial data is fixed at 8 bits.

Register format
In the UFM, each Modbus register is a 16-bit word, consisting of two 8-bit bytes. Register data in Modbus messages are packed as 2 bytes per register. The binary contents are right justified in each byte, with the high order bits in the first byte and the low order bits in the second byte.

Representation of floating-point values
The UFM stores floating-point values in IEEE 754 single precision format. The bus Master can access floating-point values from different register tables, each representing a different byte order. The user can determine the appropriate byte order by reading the first 2 registers of each table and comparing them to a fixed test value of 1234.0.

Modbus Commands
The UFM supports the following Modbus commands:

Read Holding Registers (Function Code: 03)
This command is used to read 2 to 110 contiguous holding registers from the UFM. The registers are addressed starting at zero, so holding registers numbered 1-110 are addressed as 0-109.

Read Input Registers (Function Code: 04)
This command is used to read 2 to 110 contiguous input registers from the flowmeter. The registers are addressed starting at zero, so input registers numbered 1-110 are addressed as 0-109.

Product Usage Instructions

Physical Connection
Connect the UFM board to the 2-wire bus using the screw terminals labeled ‘A’ and ‘B’. Note that some equipment manufacturers may label their terminals differently, such as ‘+’ and ‘-‘, so ensure the correct order of wire connection.

Cable Screen Connection
If necessary, connect the cable screen to the screw terminal provided on either the Master or Slave UFM.

Setting Baud Rate
Set the RS485 baud rate to 19200.

Setting Parity
Set the RS485 parity to Even.

Setting Stop Bits:
Set the RS485 stop bits to 1.

Setting Modbus Address:
The Modbus-UFM Slave address is programmable. Set the desired address from 1 to 255. The default Slave address is 1.

For more detailed information on communication software, communication command structure, UFM register map, and command definitions, refer to the user manual provided in the product package.

Introduction

Modbus RTU Slave functionality is implemented on the Sonic Driver on MODBUS WALL ultrasonic flowmeter (MODBUS WALL-UFM).

Meter settings are fully configurable on the UFM using a Windows based program running on a PC or laptop or an Android app running on a mobile phone. In addition a full range of flow measurements and diagnostics can be read from the meter.
Once installed and commissioned the computer or mobile can be disconnected and the meter wired back to a control room PCL or similar.

Mode
The Modbus RTU protocol is implemented over RS485 hardware.
Mobile connection uses a USB-OTG cable and Modbus interface. PC connection uses a USB A/B cable and a Modbus interface, see figure(1).

Figure(1) Mobile and PC connections

Physical connection to the 2-wire bus is via the screw terminals on the UFM board. The terminals are labelled ‘A’ and ‘B’.
Note that some equipment manufacturers label their terminals in other ways, e.g. ‘+’ and ‘-‘ so the exact order that the wires are connected may be reversed.
There is also a screw terminal for connection of cable screen. This may be connected at either the Master or the Slave UFM if necessary.

Baud rate
The RS485 baud rate is 19200.

Parity
The RS485 parity is Even.

Stop Bits
The RS485 stop bits is 1.

Modbus Address
The Modbus-UFM Slave address is programmable from 1 to 255.
The default Slave address is set to 1.

Data bits
RS485 serial data is fixed at 8 bits.

Register format
In the UFM each Modbus register is a 16-bit word, consisting of two 8-bit bytes.
Register data in Modbus messages are packed as 2 bytes per register. The binary contents are right justified in each byte. For each register the first byte contains the high order bits and the second byte contains the low order bits.
A floating-point number is stored as 32 bits using 4 bytes and therefore occupies 2 Modbus registers.

Representation of floating-point values
The UFM stores floating point values in IEEE 754 single precision format.
The bus Master accesses a floating-point value from any one of 4 different register tables. Each register table represents a different byte order.

Table start :Byte order: Common Description

  • 0x0000: 1,0,3,2 :Floating-point Little-Endian with byte swap (Default)
  • 0x1000 : 0,1,2,3 :Floating-point Little-Endian Format
  • 0x2000: 3,2,1,0: Floating-point Big-Endian Format
  • 0x3000 :2,3,0,1 :Floating point Big-Endian with byte swap

By reading the first 2 registers of each table the user can determine which format matches their system when a fixed test value of 1234.0 is received.

Modbus Commands

The UFM implements Modbus commands 03, 04, 06 and 16.

Read Holding Registers 03
This function code is used to read from 2 to 110 contiguous holding registers from the UFM. Registers are addressed starting at zero. Therefore holding registers numbered 1-110 are addressed as 0-109.
The Modbus Master specifies a start address and register count.

Read Input Registers 04
This function code is used to read from 2 to 110 contiguous input registers from the flowmeter. Registers are addressed starting at zero. Therefore input registers numbered 1-110 are addressed as 0-109.
The Modbus Master specifies a start address and register count.

Write Single Register 06
This function code is used to write a single register. This function code is used to program integer values in the UFM.
The Master specifies an address and 16-bit data value for write.
The value is an unsigned 16-bit value. Valid values are defined for each register address, see appendix 3
Writing a value of 0x00 to register 60011 will clear the unit’s internal error log.

Write Single Register 16
This function code is used to write multiple registers. This function code is used to program 32-bit floating-point values in the UFM.
The Master specifies an address and 32-bit data value for write.
The value is a pair of unsigned 16-bit values. Valid values are defined for each register address, see appendix 3.

Broadcast address

The UFM supports broadcast address 0.
In broadcast address mode the Modbus master can send a command to all slaves.
No response is sent by the slaves.

Communications Software

There are several communications programs available for download online.
The UFM has been tested using Modbus Poll (for Windows platform) and Modbus Monitor (for Android and Windows platforms).

Appendix 1: Communication Command Structure

Read holding registers| |
---|---|---
| Slave ID| (1 byte)
| Function| (1 byte=03H)
| Start Address| (2 bytes)
| No. of Registers R| (2 bytes)
| CRC code| (2 bytes)
Reply| |
| Slave ID| (1 byte)
| Function| (1 byte)
N = 2R| Byte Count N| (1 byte)
| Hex Data| (N bytes)
| CRC code| (2 bytes)
Read input registers| |
| Slave ID| (1 byte)
| Function| (1 byte=04H)
| Start Address| (2 bytes)
| No. of Registers R| (2 bytes)
| CRC code| (2 bytes)
Reply| |
| Slave ID| (1 byte)
| Function| (1 byte)
N = 2R| Byte Count N| (1 byte)
| Hex Data| (N bytes)
| CRC code| (2 bytes)
Write single register| Slave ID| (1 byte)
| Function| (1 byte=06H)
| Start Address| (2 bytes)
| Hex Data| (2 bytes)
| CRC code| (2 bytes)
Write multiple registers| Slave ID| (1 byte)
| Function| (1 byte=10H)
| Start Address| (2 bytes)
| No. of Registers R| (2 bytes)
N = 2R| Hex Data| (N bytes)
| CRC Code| (2 bytes)

Appendix 2: Command 03 and 04 UFM Register Map

Modbus Address Measurement/Variable Bytes Format
40001 Fixed test pattern 1234.0 4 IEEE
40002
40003 Flow Velocity (m/s) 4 IEEE
40004
40005 Flow Rate Volumetric (l/min) 4 IEEE
40006
40007 Flow Rate Mass (kg/min) 4 IEEE
40008
40009 Flow Rate Heat (KJ/s) 4 IEEE
40010
40011 Amplifier gain (dB) 4 IEEE
40012
40013 Signal Amplitude (dB) 4 IEEE
40014
40015 Signal Noise (dB) 4 IEEE
40016
40017 SNR (dB) 4 IEEE
40018
40019 Delta Time Difference (ns) 4 IEEE
40020
40021 Upstream Transit Time (us) 4 IEEE
40022
40023 Downstream Transit Time (us) 4 IEEE
40024
40025 Arrival Bin 4 IEEE
40026
40027 Signal Quality 1 (us) 4 IEEE
40028
40029 Signal Quality 2 (ADU) 4 IEEE
40030
40031 Meter Error Code 4 IEEE
40032
40033 Transducer Type (List) 4 IEEE
40034
40035 Transducer Wedge Angle (deg) 4 IEEE
40036
40037 Transducer SOS at 20 deg C (m/s) 4 IEEE
40038
40039 Transducer SOS at 60 deg C (m/s) 4 IEEE
40040
40041 Transducer Crystal Offset (m) 4 IEEE
40042
40043 Transducer Spacing Offset (m) 4 IEEE
40044
40045 Transducer Frequency Code (List) 4 IEEE
--- --- --- ---
40046
40047 Transducer Delta Time Offset(ns) 4 IEEE
40048
40049 Transducer K Factor 4 IEEE
40050
40051 Pipe Type (List) 4 IEEE
40052
40053 Pipe SOS (m/s) 4 IEEE
40054
40055 Pipe Outer Diameter (m) 4 IEEE
40056
40057 Pipe Wall Thickness (m) 4 IEEE
40058
40059 Pipe Inner Wall Roughness (m) 4 IEEE
40060
40061 Fluid Type (List) 4 IEEE
40062
40063 Fluid Temperature (deg C) 4 IEEE
40064
40065 Fluid SOS (m/s) 4 IEEE
40066
40067 Fluid Density (kg/m3) 4 IEEE
40068
40069 Fluid Kinematic (cSt) 4 IEEE
40070
40071 Fluid SHC (J/(kg.K)) 4 IEEE
40072
40073 Flow Minimum Cut-off (m/s) 4 IEEE
40074
40075 Flow Damping (s) 4 IEEE
40076
40077 Modbus Address 4 IEEE
40078
40079 Corrected SOS (m/s) 4 IEEE
40080
40081 Window Delay (us) 4 IEEE
40082
40083 Zero Tracking (On/Off) 4 IEEE
40084
40085 Zero Calibration (On/Off) 4 IEEE
40086
40087 Dynamic Temperature (On/Off) 4 IEEE
40088
40089 Inlet Temperature (deg C) 4 IEEE
40090
40091 Outlet Temperature (deg C) 4 IEEE
40092
--- --- --- ---
40093 Flow Profile K Factor 4 IEEE
40094
40095 Reynolds Number 4 IEEE
40096
40097 Number of Passes 4 IEEE
40098
40099 Tup Method 4 IEEE
40100
40101 Transducer Spacing (m) 4 IEEE
40102
40103 ATA/ETA (%) 4 IEEE
40104
40105 Iout Minimum Value (l/min) 4 IEEE
40106
40107 Iout Maximum Value (l/min) 4 IEEE
40108
40109 Relay Alarm Value (l/min) 4 IEEE
40110
40111 Interval On/Off 4 IEEE
40112
40113 NA 4 IEEE
40114
40115 NA 4 IEEE
40116
40117 NA 4 IEEE
40118
40119 Positive Volumetric Total (l) 4 IEEE
40120
40121 Negative Volumetric Total (l) 4 IEEE
40122
40123 Net Volumetric Total (l) 4 IEEE
40124

Text Strings, company name (26 chars), model code (26 chars), serial number (8 chars), HW/SW version (6 chars)

Modbus Address Text Strings, 2 chars Bytes Format
40300 So 2 Word
40301 ni 2 Word
40302 c< > 2 Word
40303 Dr 2 Word
40304 Iv 2 Word
40305 er 2 Word
40306 < >< > 2 Word
40307 < >< > 2 Word
40308 < >< > 2 Word
40309 < >< > 2 Word
--- --- --- ---
40310 < >< > 2 Word
40311 < >< > 2 Word
40312 < >< > 2 Word
40313 MO 2 Word
40314 DB 2 Word
40315 US 2 Word
40316 < >W 2 Word
40317 AL 2 Word
40318 L- 2 Word
40319 UF 2 Word
40320 M< > 2 Word
40321 ST 2 Word
40322 D< > 2 Word
40323 < >< > 2 Word
40324 < >< > 2 Word
40325 < >< > 2 Word
40326 10 2 Word
40327 00 2 Word
40328 00 2 Word
40329 00 2 Word
40330 20 2 Word
40331 02 2 Word
40332 00 2 Word

Serial number in the example is 1000000, HW and SW versions are 2.00 and 2.00.

Signal Data Trace Values, as pairs of 8-bit values.

Modbus Address| Signal Data Trace Value Pairs| Bytes| Format
---|---|---|---
| | |
40401| 8-bit data point 0, 8-bit data point 1| 2| WORD
40402| 8-bit data point 2, 8-bit data point 3| 2| WORD
40403| 8-bit data point 4, 8-bit data point 5| 2| WORD
40404| 8-bit data point 6, 8-bit data point 7| 2| WORD
40405| 8-bit data point 8, 8-bit data point 9| 2| WORD
40406| 8-bit data point 10, 8-bit data point 11| 2| WORD
..| …,…| ..| …
..| …,…| ..| …
40649| 8-bit data point 496, 8-bit data point 497| 2| WORD
40650| 8-bit data point 498, 8-bit data point 499| 2| WORD

Appendix 3: Command 06 and 16 Definitions

| Write Single| Write Multiple| 16/32 bit Write| Value| Default| Minimum| Maximum| SI Unit|
---|---|---|---|---|---|---|---|---|---
Value| CMD 06| CMD 16| | | | | | |
Transducer Type| 0| | 16| 1| 1| 0| 3| List| DN40/DM10/DM20/DS10
Transducer Wedge Angle| | 0| 32| 40.000| 40.000| 1.000| 90.000| deg|
Transducer SOS at 20degC| | 2| 32| 2522.000| 2522.000| 500.000| 7000.000| m/s|
Transducer SOS at 60degC| | 4| 32| 2522.000| 2522.000| 500.000| 7000.000| m/s|
Transducer Crystal Offset| | 6| 32| 0.012| 0.012| 0.001| 0.100| m|
Transducer Spacing Offset| | 8| 32| 0.030| 0.030| 0.001| 0.100| m|
Transducer Transmit Code| 1| | 16| 1| 1| 0| 2| | 4/1/2 MHz
Transducer Delta Transit Time Offset| | 10| 32| 0| 0| -2.00E-08| 2.00E-08| s|
Transducer K Factor| | 12| 32| 1.000| 1.000| 0.001| 1000.000| |


Pipe Type

| ****

2

| | ****

16

| ****

0

| ****

0

| ****

0

| ****

6

| ****

List

| Carbon Steel/Stainless Steel/Copper/PVC/Cast Iron/Ductile Iron/HDPE
Pipe SOS| | 14| 32| 3230.0| 3230.0| 500.0| 7000.0| m/s|
Pipe Outer Diameter| | 16| 32| 0.0606| 0.0606| 0.01| 6.50| m|
Pipe Wall Thickness| | 18| 32| 0.0032| 0.0032| 0.0005| 0.1| m|
Pipe Inner Wall Roughness| | 20| 32| 0.00001| 0.00001| 0.000001| 0.002| m|
Fluid Type| 3| | 16| 0| 0| 0| 3| List| Water/Petrol/Diesel/Glycol-Water
Fluid Temperature| | 22| 32| 18.000| 18.000| 0.000| 150.000| deg C|
Fluid SOS| | 24| 32| 1475.000| 1475.000| 50.000| 3000.000| m/s|
Fluid Density| | 26| 32| 998.520| 998.520| 50.000| 3000.000| kg/m2|
Fluid Kinematic| | 28| 32| 1.080| 1.080| 0.001| 40000.000| cSt|
Fluid Specific Heat Capacity| | 30| 32| 4184.000| 4184.000| 10.000| 10000.000| J/(g.K)|
Minimum Flow Cut Off| | 32| 32| 0.025| 0.025| 0.000| 1.000| m/s|
Flow damping| 4| | 16| 10| 10| 0| 255| s|
---|---|---|---|---|---|---|---|---|---
Modbus Address| 5| | 16| 1| 1| 1| 255| |
Transducer Wedge Corrected SOS| | 34| 32| 2522.000| 2522.000| 500.000| 7000.000| m/s|
Sampling Window delay| 6| | 16| 169| 169| 11| 65535| us|
Zero Tracking On/Off| 7| | 16| 1| 1| 0| 1| On/Off
Zero calibration On/Off| 8| | 16| 0| 0| 0| 1| On/Off
Dynamic Temperature On/Off| 9| | 16| 0| 0| 0| 1| On/Off
Number of Passes| 10| | 16| 4| 4| 1| 16| |
Tup Method| 12| | 16| 3| 3| 0| 4| List| Method 0, 1, 2, 3, 4
Iout Minimum Value| | 36| 32| 0| 0| -1000000.0| 1000000.0| l/min|
Iout Maximum Value| | 38| 32| 160.0| 160.0| -1000000.0| 1000000.0| l/min|
Relay Alarm Value| | 40| 32| 40.0| 40.0| -1000000.0| 1000000.0| l/min|
Interval On/Off| 13| | 16| 0| 0| 0| 5| On/Off| 0 – Off, 5 – On

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