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Communication

OCT output

SPEC

Please see the page of mechanical and electrical installation.

Cable wiring

Please see the page of mechanical and electrical installation.

Parameter setup

Please refer to the parameter set-up page.

Set-up steps as below:

Connect cable first according to the cable wiring section on this page.
Set up parameter E01 for selecting NC(Normal Close) or NO(Normal Open) when there is no signal.
Set up parameter E02 for specifying output signal content.
1. For selecting “pulse output”
  1. Use E03 to confirm each pulse width.
  2. Use F03 to simulate specific pulse output frequency at OCT for testing with external devices.
2. For selecting “out of range flow volume notice”.
  1. Use D04 to turn on the alarm.
  2. Use D05 D06 for specifying normal flow range.
  3. Use D07 for specifying hysteresis range percentage. D07 is a positive value, it means the ranges single must exceed in order to disable the alarm.
  4. Set up F01 and F02 for simulate flow volume and go back to the monitoring screen to confirm the alarm works
  5. Turn off the simulation mode.
3. For selecting “Total Ala.” (“Inform of over total target”)
  1. Use D08 to turn off alarm
  2. Use D09 for specifying notification conditions. "Larger Than" is for positive flow direction, "Less Than" is for negative flow direction.
  3. Use D10 for specifying total target, positive number is for positive flow, negative number is for negative flow.
  4. Set up F01 and F02 to simulate flow volume and go back to the monitoring screen to confirm the alarm works.
  5. Turn off the simulation mode.
Go back to the monitoring screen, finish.

Pulse output

Pulse output is based on the frequency of the paddle wheel’s revolutions. Due to not adapting LORRIC’s data processing technology, it is only applicable to the environment without high precision request. A pulse will be sent by every 180° revolution. To calculate the total flow volume for a certain period of time, count the number of pulse signals received then divided by the corresponding K-value this manual provides. K value is defined by pipe size and material. Please refer to T-connector page.

4-20mA

SPEC

Please see the page of mechanical and electrical installation.

Cable wiring

Please see the page of mechanical and electrical installation.

Parameter setup

Please refer to the parameter set-up page.

Set-up steps as below:

Connect cable first according to the cable wiring section on this page.
Set up parameter E06 for selecting the data to output.
Parameter E07 and E08 are for specifying maximum and minimum value to output. These 2 values can be either positive or negative, however, E07 has to be smaller than E08.
Use E09 to set output current milliamps when output data is out of the E07 and E08 range, there are 3 options:
1. "2.4 & 21.6" stands for outputting 2.4mA when data is less than E07 value, and outputting 21.6mA when data is greater than E08 value.
2. "2.4" stands for outputting 2.4mA when data is less than E07 value and greater than E08 value.
3. "21.6" stands for outputting 2.4mA when data is less than E07 value and greater than E08 value.
Turn on F02.
Please enter the E11 parameter page to test and adjust 4mA output current. Adjustment unit is uA.
Please enter the E12 parameter page to test and adjust 20mA output current. Adjustment unit is uA..
If the output current is too low and can not reach 20mA after adjustment, please check the electrical installation page for line impedance and supply voltage requirement.
Turn off F02 and go back to the monitoring screen.
Finish.

RS485

SPEC

Please see the page of mechanical and electrical installation.

Cable wiring

Please see the page of mechanical and electrical installation.

Parameter setup

Please refer to parameter set-up page.

Set-up steps as below:

Connect cable according to the cable wiring section on this page.
This machine uses Modbus RTU protocol, communication parameter set-up as below.：
1. Set E04 for RS485 address, and please make sure there is no other device using the same address.
2. Set E05 for specifying communication Baud, this machine supports 9600, 19200, 38400 and 57600.
Please go back to the monitoring screen. RS485 only responses on monitoring screens.
If needed, please use F01 and F02 to set up the machine to do communication test under simulation mode.
Please refer to the Modbus RTU protocol page for testing the memory with read and write instruction.
Turn off F02 simulation mode.
Finish.

Modbus RTU Protocol

Communications format

bit order: lsb first

byte order: big endian

Data bits:8

Parity: None

Stop bits: 1

Floating point number follows IEEE754-1985. The float32 below stands for 32bits Single precision floating point number.

Terminology

‌‌Register: Length of 2 Byte or 16bit which is unit length of memory in Modbus RTU.

‌Byte: 8 bit length

Definition and function of memory

Modbus memory is divided into two categories, read-only and read-write.

Read-only type is mainly for flow meter status related memory, such as instantaneous flow rate. This is also the most commonly used memory. Detail information in following page:

Read-write memory is mainly to set-up parameters such as pipe diameter, and to reset variables, such as set zero on the cumulative flow. Read-write memory is only readable by using instruction 03. You can only change one parameter at a time with the write operation. If the length of the target register is 1, please use instruction 06. If the length is 2 registers, please use instruction 30. Please see read-write memory detail page below:

Read-write memory instruction detail information as below:

Read-only memory read instruction(04) and memory lists

Instruction example

Format of command (04) from master

Description of master command

The example will read instantaneous flow volume.

slave address: 01(address of this flowmeter)

function code: 04(read instruction)

Address of first reading register: 0000(Address of first register to read)

Quantity of registers to be read: 0002 (need to read 2 registers from 0000)

CRC: 71 CB(Calculating error correcting code according to CRC algorithm)

Format of flowmeter response(04)

Description of flowmeter response example

slave address: 01(address of this flowmeter)

function code: 04(read instruction)

Amount of response Byte: 04 (2 register=4 byte)

Data Byte: 00 00 00 00(Assume the instantaneous flow volume is 0)

CRC: FB 84(Calculating error correcting code according to CRC algorithm)

Definition and address of memory

How to use these charts

Read-only memory list

Read-write memory list

How to use read-write memory list

Read-write memory list

Each definition of multiple choice memory type

Read-write memory read instruction(03)

Instruction example

Format of command (03) from master

Description of master command

The example will read A01 pipe diameter options and A02 Scale Factor.

slave address: 01(address of this flowmeter)

function code: 03(read instruction)

Address of first reading register: 0000(Address of first register to read)

Quantity of registers to be read: 0003 (need to read 2 registers from 0000)

CRC: 05 CB (Calculating error correcting code according to CRC algorithm)

Format of flowmeter response(03)

Description of flowmeter response example

slave address: 01(address of this flowmeter)

function code: 03(read instruction)

Amount of response Byte: 06 (3 register=6byte)

Data Byte:

00 00(Current pipe diameter is 1inch PVC)
3F 80 00 00(Current Scale Factor is 1.0)

CRC: 2C 89 (Calculating error correcting code according to CRC algorithm)

Read-write memory single Register write instruction(06)

This instruction if for memory with 1 register length only, please refer to the list.

Instruction example

Format of command (06) from master

Description of master command

This example will change A01 pipe diameter option

slave address: 01(address of this flowmeter)

‌function code: 06(Single Register write instruction)

Address of first reading register: 0000(memory address to write)

Write data: 0000 (1" PVC pipe)

‌CRC: C40B (Calculating error correcting code according to CRC algorithm)

Format of flowmeter response(06)

Description of flowmeter response example

Valid command received. It will output the same command back to master.

‌slave address: 01(address of this flowmeter)

‌function code: 06(Single Register write instruction)

Address of first reading register: 0000(memory address to write)

Write data: 0000 (1" PVC pipe)

‌CRC: C40B (Calculating error correcting code according to CRC algorithm)

Read-write memory double Register write instruction(30)

This instruction if for memory with 2 register length only, please refer to the list.

Instruction example

Format of command (30) from master

Description of master command

This example will change A02 Scale Factor value to 2.50

slave address: 01(address of this flowmeter)

function code: 30(double Register write instruction)

Address of first reading register: 0001(memory address to write)

Write data: 40 20 00 00 (Change A02 Scale Factor value to 2.50)

‌CRC: 98 0E (Calculating error correcting code according to CRC algorithm)

Format of flowmeter response(30)

Description of flowmeter response example

Valid command received. It will output the same command back to master.

slave address: 01(address of this flowmeter)

function code: 30(double Register write instruction)

Address of first reading register: 0001(memory address to write)

Write data: 40 20 00 00 (Change A02 Scale Factor value to 2.50)

CRC: 98 0E (Calculating error correcting code according to CRC algorithm)