Read-write memory double Register write instruction(30)

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

Register location	Memory definition	Data type
0001	scale factor	float 32
0304	upper limit	float 32
0306	lower limit	float 32
030B	Total Target	float 32
0406	4mA Value	float 32
0408	20mA Value	float 32
040B	4mA Adjust	float 32
040D	20mA Adjust	float 32

Instruction example

Format of command (30) from master

Byte#	1	2	3	4	5	6	7	8	9	10
Node ID	Slave Address	Function Code	Memory address to write	Memory address to write	Write data	Write data	Write data	Write data	CRC	CRC
Example 01~FF	01	30	00	01	40	20	00	00	98	0E

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)

Byte#	1	2	3	4	5	6	7	8	9	10
Node ID	Slave Address	Function Code	Memory address to write	Memory address to write	Write data	Write data	Write data	Write data	CRC	CRC
Example 01~FF	01	30	00	01	40	20	00	00	98	0E

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)