Read/Write Memory Dual-Register Write Command (30)

For large numbers, writing and reading in different formats (float32/int64) may result in a discrepancy of less than 1/10,000. This command is limited to memory with a register length of 4. Please refer to the provided list.

Example Command:

Format for Issuing the Write Command (30) from the Control Terminal

Byte#	1	2	3	4	5	6	7	8	9	10
Node ID	Slave Address	Function Code	Starting Address of Data to Write	Starting Address of Data to Write	Data to Write	Data to Write	Data to Write	Data to Write	CRC	CRC
Example Content 01~FF	01	30	00	15	00	00	00	00	BC	07

Example Explanation of Control Terminal Command

This example modifies the A18 Low Flow Cutoff value to 0 (default).

• Slave Address: 01 (Address of the flow meter)

• Function Code: 30 (Dual-register write command)

• Starting Address of Data to Write: 00 15 (Memory address for A18 Low Flow Cutoff)

• Data to Write: 00 00 00 00 (Set A18 Low Flow Cutoff value to 0)

• CRC: BC 07 (Error-checking code calculated using the CRC algorithm)

Flow Meter Response Format (30)

Byte#	1	2	3	4	5	6	7	8	9	10
Node ID	Slave Address	Function Code	Starting Address of Data to Write	Starting Address of Data to Write址	Data to Write	Data to Write	Data to Write	Data to Write	CRC	CRC
範例內容01~FF	01	30	00	15	00	00	00	00	BC	07

Example Explanation of Flow Meter Response

If the write command format is correct, the received control command will be echoed back to the master device.

• Slave Address: 01 (Address of the flow meter)

• Function Code: 30 (Dual-register write command)

• Starting Address of Data to Write: 00 15 (Memory address for A18 Low Flow Cutoff)

• Data to Write: 00 00 00 00 (Set A18 Low Flow Cutoff value to 0)

• CRC: BC 07 (Error-checking code calculated using the CRC algorithm)