Read/Write Memory – Read Listx

When reading large values with different data formats (e.g., Float32 or Int64), tiny differences may occur due to internal calculations, typically less than 1/10,000, which is normal.

Read commands must not exceed 20 registers; longer requests will be ignored. See the register list for details.

How to Use the Read/Write Memory List

Field Name	Function
Register Address	Addresses for read/write memory, not shared with read-only memory.
Register Length	Length of the register variable.
Memory Content Name	Describes the name or purpose of the memory content.
Data Type	Specifies the format of transmitted or received data.
Read Command	Indicates the available read commands.
Write Command	Indicates the available write commands. A value of X in this column means remote writing is not supported for that register.

Read-Write Memory List

Register Address	Decimal	Master Address	Reg Length	Memory Content Name	Data Type	Read Command	Write Command
A parameter Category
0x0000	0	40001	1	A02 Preset Pipe Spec	int16	03	Ｘ
0x0001	1	40002	1	A03 Pipe Geo Unit	int16	03	06
0x0002	2	40003	2	A04 Pipe Outer Diameter	float32	03	Ｘ
0x0004	4	40005	2	A05 Pipe Perimeter	float32	03	Ｘ
0x0006	6	40007	2	A06 Pipe Thickness	float32	03	Ｘ
0x0008	8	40009	2	A07 Pipe Inner Diameter	float32	03	Ｘ
0x000A	10	40011	1	A08 Pipe Material	int16	03	Ｘ
0x000B	11	40012	2	A09 Pipe Soundspeed	float32	03	Ｘ
0x000D	13	40014	1	A10 Liquid Type	int16	03	Ｘ
0x000E	14	40015	2	A12 Liquid Soundspeed	float32	03	Ｘ
0x0010	16	40017	2	A13 K Viscosity cst	float32	03	Ｘ
0x0012	18	40019	1	A15 Damping	int16	03	06
0x0013	19	40020	1	A16 Direction	int16	03	06
0x0014	20	40021	1	A17 Neg Flow	int16	03	06
0x0015	21	40022	2	A18 Low Flow Cutoff	float32	03	30
0x0017	23	40024	1	A19 Fast Update	int16	03	06
0x0018	24	40025	1	A20 Anti Noise	int16	03	06
0x0019	25	40026	2	A23 Zero Offset	float32	03	30
0x001B	27	40028	1	A24 Start up check	int16	03	06
0x001C	28	40029	1	A25 Off-pipe zero	int16	03	06
0x001D	29	40030	1	A26 Beta Mode	int16	03	06
B parameter Category
0x0100	256	40257	1	B01 Vol Unit	int16	03	06
0x0101	257	40258	1	B02 Time Unit	int16	03	06
0x0102	258	40259	1	B03 Total Unit	int16	03	06
0x0103	259	40260	1	B04 VelocityUnit	int16	03	06
0x0104	260	40261	1	B05 Dec Place	int16	03	06
0x0105	261	40262	1	B06 Pipe Geo Unit	int16	03	06
K parameter Category
0x0A00	2560	42561	1	K02 Calibra Mode	int16	03	06
0x0A01	2561	42562	2	K03 Scale Factor	float32	03	30
0x0A03	2563	42564	2	K04 Manual Offset	float32	03	30
0x0A05	2565	42566	2	K05 Totalizer Scale	float32	03	30
C parameter Category
0x0200	512	40513	1	C01 Total Method	int16	03	06
0x0201	513	40514	1	C02 Del Total	int16	03	06
0x0202	514	40515	1	C03 Dosing Mode	int16	03	06
0x0203	515	40516	2	C04 Dosing Target	float32	03	30
0x0205	517	40518	1	C05 Dosing Reset Time	int16	03	06
0x0283	643	40644	4	C04 Dosing Target(64)	int64	03	31
D parameter Category
0x0300	768	40769	1	D01 BoardComm Ala	int16	03	06
0x0301	769	40770	1	D02 Pipe Sensor Alarm	int16	03	06
0x0302	770	40771	1	D03 Bad UltraS Signal	int16	03	06
0x0303	771	40772	1	D04 Off Pipe Alarm	int16	03	06
0x0304	772	40773	1	D05 FlowLIM Ala	int16	03	06
0x0305	773	40774	2	D06 Up LIM	float32	03	30
0x0307	775	40776	2	D07 Low LIM	float32	03	30
0x0309	777	40778	1	D08 Hysteresis%	int16	03	06
0x030A	778	40779	1	D09 Total Ala	int16	03	06
0x030B	779	40780	1	D10 Total Trig	int16	03	06
0x030C	780	40781	2	D11 Total Target	float32	03	30
0x030E	782	40783	1	D12 Iout Alarm	int16	03	06
0x030F	783	40784	1	D13 Speed Alarm	int16	03	06
0x0310	784	40785	1	D14 PulseOverlap	int16	03	06
0x0311	785	40786	1	D15 IoutStatAla	int16	03	06
0x0312	786	40787	1	D16 Dosing Alarm	int16	03	06
0x038C	908	40909	4	D11 Total Target(64)	int64	03	31
E parameter Category
0x0400	1024	41025	1	E01 NC/NO	int16	03	06
0x0401	1025	41026	1	E02 OCT Info	int16	03	06
0x0402	1026	41027	1	E03 Pulse Width	int16	03	06
0x0403	1027	41028	1	E06 Iout Def	int16	03	06
0x0404	1028	41029	2	E07 4mA Value	float32	03	30
0x0406	1030	41031	2	E08 20mA Value	float32	03	30
0x0408	1032	41033	1	E09 Iout Error	int16	03	06
0x0409	1033	41034	2	E11 4mA Adj uA	float32	03	30
0x040B	1035	41036	2	E12 20mA Adj uA	float32	03	30
0x040D	1037	41038	1	E13 Iout Range	int16	03	06
0x040E	1038	41039	1	E14 PulseV2 Unit	int16	03	06
0x040F	1039	41040	1	E17 Endianness	int16	03	06
F parameter Category
0x0500	1280	41281	2	F01 Sim Volume	float32	03	30
0x0502	1282	41283	1	F02 Sim Mode	int16	03	06
H parameter Category
0x0700	1792	41793	1	H01 LED Bri	int16	03	06
0x0701	1793	41794	1	H02 LCD Bri	int16	03	06
0x0702	1794	41795	1	H03 Green Light	int16	03	06
0x0703	1795	41796	1	H04 Language	int16	03	06
0x0704	1796	41797	1	H06 Reset	int16	03	06
0x0705	1797	41798	1	H07 Lock Device	int16	03	06
0x0706	1798	41799	1	H08 Password	int16	03	06
0x0707	1799	41800	1	H09 Home Page	int16	03	06
0x0708	1800	41801	1	H10 Debug Page	int16	03	06

Example: C02 Del Total (clear/reset totalized flow)

Step	Value
Table Register Address (Hex)	0x0201
Converted to decimal	0x0201 = 2×256 + 1 = 513
Master address to enter (4xxxx convention)	40001 + 513 = 40514
Address bytes in the frame	02 01
Full write frame (station 01)	01 06 02 01 00 01 18 72

If 40201 is entered by mistake, the master sends decimal 200 (0x00C8) — an address that doesn't exist. The flow meter won't respond, or may return exception code 02; on the PLC side this appears as "no response to write."

Self-verification tip

If you're not sure which address convention your master uses, first use function code 03 to read the register that corresponds to Modbus ID. If the value read back matches the device's own station number, the address base is correct and you can safely apply the same convention to the other addresses.