SH-CMF Coriolis flow meter Modbus RTU configuration

SH-CMF Series Digital Coriolis Mass flow meter RS485,Modbus RTU configuration

Serial No.	Register	Address	Definition
1	41001	0x03E8 / 1000	Mass Flow
2	41003	0x03EA / 1002	Volume Flow
3	41005	0x03EC / 1004	Totalized Mass
4	41007	0x03EE / 1006	Totalized Volume Flow
5	41009	0x03F0 / 1008	Density
6	41011	0x03F2 / 1010	Temperature
7	41013	0x03F4 / 1012	Vibration Frequency
8	41015	0x03F6 / 1014	Flowmeter Model No.
9	41017	0x03F8 / 1016	Tag No.
10	41019	0x03FA / 1018	Flow Unit
11	41021	0x03FC / 1020	Density Unit
12	41023	0x03FE / 1022	Flow Range
13	41025	0x0400 / 1024	Decimal Places
14	41027	0x0402 / 1026	Small Flow cut off
15	41029	0x0404 / 1028	Display Fresh Time
16	41031	0x0406 / 1030	Internal Parameter
17	41033	0x0408 / 1032	Internal Parameter
18	41035	0x040A / 1034	Internal Parameter
19	41037	0x040C / 1036	Medium Measured
20	41039	0x040E / 1038	Current Output Select
21	41041	0x0410 / 1040	Input Density Value
22	41043	0x0412 / 1042	Internal Parameter
23	41045	0x0414 / 1044	Internal Parameter
24	41047	0x0416 / 1046	Internal Parameter
25	41049	0x0418 / 1048	Total Flow Clear
26	41051	0x041A / 1050	Internal Parameter
27	41053	0x041C / 1052	Internal Parameter
28	41055	0x041E / 1054	Internal Parameter
29	41057	0x0420 / 1056	Internal Parameter
30	41059	0x0422 / 1058	Internal Parameter
31	41061	0x0424 / 1060	Internal Parameter
32	41063	0x0426 / 1062	Internal Parameter
33	41065	0x0428 / 1064	Internal Parameter
34	41067	0x042A / 1066	Internal Parameter
35	41069	0x042C / 1068	Internal Parameter
36	41071	0x042E / 1070	Internal Parameter

Each register is 4 bytes (2 consecutive holding registers), occupying two addresses (low address addressing);

The shaded registers in the above table are read-only registers, and write operations are invalid;

Address 0x41049 is the Total Flow clear register. Write “0” to this address to perform Total Flow clear operation.

Return 1 (float)

The flow unit setting is 0-7 (convert data to 4 bytes floating point for transmission):

0→t/h；1→kg/h；2→g/h；3→kg/min ；4→g/min；5→m3/h；6→L/min；7→ml/min

Density unit setting is 0-2 (convert data to 4 bytes floating point for transmission):, respectively g/cm³、g/L、t/m³；

0→g/cm³；1→g/L；2→t/m³

Measure medium settings 0-1, representing liquids and gases, convert them to 4 bytes floating point transmission;

ModBus Communication Protocol (RTU format)

Check mode: no check

Data bit: 8

Stop bit: 1

ModBus Communication Protocol (RTU format)

Check mode: no check

Data bit: 8

Stop bit: 1

ModBus Communication Protocol (RTU format)

1, read N variables

Host request information frame:

Instrument address +0x03+ register start address (2 bytes, upper byte first) + register read/write number 2*N (2 bytes, upper byte first) + CRC check code (2 bytes, lower word)

Slave response message frame:

Instrument address + 0x03+ bytes of data 4*N (1 byte) + register data (4*N byte, upper byte first) + CRC (2 bytes, lower byte first)

Example:

2, write N variables

Host request information frame:

Instrument address + function code 0x10 + register start address (2 bytes, upper byte first) +Register read/write number 2*N (2 bytes, high byte first) + data byte 4*N (1 byte) + data to be written (4*N bytes, upper byte first) + CRC (2 Bytes, lower byte first)

Slave response message frame:

Instrument address + function code 0x10 + register start address (2 bytes, upper byte first) register Reader read/write number 2*N (2 bytes, upper byte first) +(2 bytes, lower byte first)