Coriolis Mass Flow Meters RS 485 RTU Communication Protocol

Silver Automation Instruments is China supplier for SH-CMF Series Coriolis Mass Flow meters. Both the price and quality has its advantages. And below is information for Coriolis Mass Flowmeter RS 485 RTU Communication Protocol.

Address:

S/N.	Holding Register	Access Address (Hex/ Decimal)	Definition
1	41001	0x03E8 / 1000	Mass Flow
2	41003	0x03EA / 1002	Volume Flow
3	41005	0x03EC / 1004	Total Mass
4	41007	0x03EE / 1006	Total Volume
5	41009	0x03F0 / 1008	Density
6	41011	0x03F2 / 1010	Temperature
7	41013	0x03F4 / 1012	Pipeline Vibration Frequency
8	41015	0x03F6 / 1014	Module
9	41017	0x03F8 / 1016	S/N
10	41019	0x03FA / 1018	Flow Unit
11	41021	0x03FC / 1020	Density Unit
12	41023	0x03FE / 1022	Range
13	41025	0x0400 / 1024	Decimal Places
14	41027	0x0402 / 1026	Tiny Signal Cut Ratio
15	41029	0x0404 / 1028	Display Refresh Time
16	41031	0x0406 / 1030	Internal Mass Flow Meter Parameters
17	41033	0x0408 / 1032	Internal Mass Flow Meter Parameters
18	41035	0x040A / 1034	Internal Mass Flow Meter Parameters
19	41037	0x040C / 1036	Measured Medium
20	41039	0x040E / 1038	Current Output Selection
21	41041	0x0410 / 1040	Input Password
22	41043	0x0412 / 1042	Internal Mass Flow Meter Parameters
23	41045	0x0414 / 1044	Internal Mass Flow Meter Parameters
24	41047	0x0416 / 1046	Internal Mass Flow Meter Parameters
25	41049	0x0418 / 1048	Total Data Clearance
26	41051	0x041A / 1050	Internal Mass Flow Meter Parameters
27	41053	0x041C / 1052	Internal Mass Flow Meter Parameters
28	41055	0x041E / 1054	Internal Mass Flow Meter Parameters
29	41057	0x0420 / 1056	Internal Mass Flow Meter Parameters
30	41059	0x0422 / 1058	Internal Mass Flow Meter Parameters
31	41061	0x0424 / 1060	Internal Mass Flow Meter Parameters
32	41063	0x0426 / 1062	Internal Mass Flow Meter Parameters
33	41065	0x0428 / 1064	Internal Mass Flow Meter Parameters
34	41067	0x042A / 1066	Internal Mass Flow Meter Parameters
35	41069	0x042C / 1068	Internal Mass Flow Meter Parameters
36	41071	0x042E / 1070	Internal Mass Flow Meter Parameters

Attention:

Each holding register is 4 bytes (2 consecutive maintain registers), and it takes two addresses (low address). The register with a background in the tables is read-only register. The writing operation is invalid.

The address of 0x41049 is total-data clearance register. Write 0 in this address could process the clearance operation. Read the register and it will returns back to 1 (Floating point number).

The flow unit setting is 0-7 (The data will be transferred to 4-byte floating point number to transfer).

0èt/h；1èkg/h；2èg/h；3èkg/min；4èg/min；5èm3/h；6èL/min；7èml/min

The density unit setting is 0-2 (The data will be transferred to 4-byte floating point number to transfer). And it respectively stands for: g/cm3、g/L、t/m3

0è g/cm3；1èg/L；2èt/m3

The current output selection is 0-1. And it respectively stands for flow and density. The data will be transferred to 4-byte floating point number to transfer.

The measured medium setting is 0-1. And it respectively stands for liquid and gas. The data will be transferred to 4-byte floating point number to transfer.

ModBus Communication (RTU Format)

Check Method: no check

Data Bits: 8

Stop Bits: 1

Coriolis MassFlow meters ModBus Communication Protocol (RTU)

1. Read N variables

The host requested information frame:

Mass Flow Meter Address+0x03+Register’s Starting Address（2bytes，High Byte is in the front）+ Number of Register’s Reading and Writing 2*N（2bytes，High Byte is in the front）+ CRC Check Code（2bytes，Low Byte is in the front）

Response Information from the machine frame:

Mass Flow Meter Address +0x03+Bytes of Data 4*N（1字节）+ Register’s Data（4*N bytes，High Byte is in the front）+ CRC Check Code（2 bytes，Low Byte is in the front）

For Example:

2. Write N variables

The host requested information frame:

Mass Flow Meter Address +Function Code 0x10+ Register’s Starting Address（2 bytes，High Byte is in the front）+ Number of Register’s Reading and Writing 2*N（2bytes，High Byte is in the front）+ Bytes of Data 4*N（1byte）+Data waiting to be written（4*N bytes，High Byte is in the front）+ CRC Check Code（2 bytes，Low Byte is in the front）

Response Information from the machine frame:

Mass Flow Meter Address + Function Code 0x10+ Register’s Starting Address（2 bytes，High Byte is in the front）Number of Register’s Reading and Writing 2*N（2bytes，High Byte is in the front）+

（2 bytes，Low Byte is in the front）

China Coriolis Mass Flowmeter Supplier: Silver Automation Instruments

More information http://www.silverinstruments.com/product/flow-measurement/coriolis-mass-flow-meter.html