Single Bit Data Read/Write Commands (01/05) (Commonly Used in HMIs)

Purpose and Use Cases: Certain Human-Machine Interfaces (HMIs) only support the 05 Write Command to send a signal to reset the accumulated total. Additionally, some HMIs require support for the 01 Read Command to verify that the sensor is functioning correctly.

01 Command Example

This command does not reset the C02.Del.Total (Clear Accumulated Total) option. It only provides the HMI with the ability to read Single Bit data using the 01/05 commands. If the command format is correct, the flow meter will respond to the master device with a Bit read acknowledgment.

Control Terminal TX (Transmit) Command Example for 01

Byte#	1	2	3	4	5	6	7	8
Node ID	Slave Address	Function Code	Starting Address of Data to Read	Starting Address of Data to Read	Data to Read (Bits)	Data to Read (Bits)	CRC	CRC
Example 01~FF	01	01	02	01	00	01	AD	B2

Control Terminal TX (Transmit) Command Example for 01

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

• Function Code: 01 (1-bit Read Command)

• Starting Address of Data to Read: 02 01 (Start address for C02.Del.Total Clear Accumulated Total)

• Data to Read (Bits): 00 01 (Read C02.Del.Total data)

• CRC: AD B2 (Error-checking code calculated using the CRC algorithm)

Flow Meter RX (Receive) Response Example for 01

Byte#	1	2	3	4	5	6
Node ID	Slave Address	Function Code	Response Bit	Response Bit	CRC	CRC
Example 01~FF	01	01	01	00	51	88

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

• Function Code: 01 (Read Command)

• Response Bit: 01 00 (The flow meter is still online and operational, responding to the control terminal)

• CRC: 51 88 (Error-checking code calculated using the CRC algorithm)

05 Command Example

This example activates the C02.Del.Total option to clear accumulated data, resetting the total to zero.

Control Terminal TX (Transmit) Command Example for 05

Byte#	1	2	3	4	5	6	7	8
Node ID	Slave Address	Function Code	Starting Address of Data to Write	Starting Address of Data to Write	Data to Write	Data to Write	CRC	CRC
Example 01~FF	01	05	02	01	FF	00	DC	42

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

• Function Code: 05 (Register Write Command)

• Starting Address of Data to Write: 02 01 (Start address for C02.Del.Total Clear Accumulated Total)

• Data to Write: FF 00 (Reset C02.Del.Total data)

• CRC: DC 42 (Error-checking code calculated using the CRC algorithm)

Flow Meter RX (Receive) Response Example for 05

Byte#	1	2	3	4	5	6	7	8
Node ID	Slave Address	Function Code	Starting Address of Data to Write	Starting Address of Data to Write	Data to Write	Data to Write	CRC	CRC
Example 01~FF	01	05	02	01	FF	00	DC	42

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

• Function Code: 05 (Register Write Command)

• Starting Address of Data to Write: 02 01 (Memory address for C02.Del.Total Clear Accumulated Total)

• Data Written: FF 00 (Acknowledgment of reset action sent back to the control terminal)

• CRC: DC 42 (Error-checking code calculated using the CRC algorithm)