Examples
Modbus TCP Client Using CloudAccess
- A well formatted mapping file needs to be created
- Download example: ca_modbus.xlsx
- Important
- Use unique GUIDs
- Online generator: https://guidgenerator.com/online-guid-generator.aspx
- Do NOT use public IP address for communication. Use CloudAccess instead
- Go to https://generator.mervis.info, select mapping file and past parameters (or select .txt file)
- Important
- Use unique GUID for a new project
- Use correct Mervis DB info
- Working DB URL
- User name, password
- Unique “Root” key for each project
Modbus
Supported data types
| Bit |
| UInt8 |
| SInt8 |
| UInt16 |
| SInt16 |
| UInt32 |
| SInt32 |
| Float32 |
| Float64 |
| SInt48 |
| UInt48 |
| SInt64 |
| UInt64 |
Supported Modbus functions
| Function | Code |
|---|---|
| ReadCoils | 1 |
| ReadDiscreteInputs | 2 |
| ReadHoldingRegister | 3 |
| ReadInputRegister | 4 |
| Function | Code |
|---|---|
| WriteSingleCoil | 5 |
| WriteMultipleCoils | 15 |
| WriteSingleRegister | 6 |
| WriteMultipleRegisters | 16 |
Generator Parameters
- modbus-params.txt
--sourceType MervisDb --projId ecd6fa5d-78c1-4120-9b11-23521bee7688 --projName "AnyNameWouldDoModbus" --projTimeZone "Europe/Prague" --mdbConnStr "rcwaredb://uuuuuser:ppppasword@db.mervis.info:443/?protocol=https,endpoint=RcWareDbHttpsAccess,uriaccess=db/imports5/RcWareDbAccess" --mdbDpNameKey {FixedName} --mdbSourceKeys "(Root|ahoj|true)" --mdbTreeLevelKeys Level1/Level2 --outputDirectory ecd6fa5d-78c1-4120-9b11-23521bee7688 --useDbV2 --mdbUnitKey Unit --mdbExportOnlyIdKeys --dbWriteModeOn --dbWriteModeSamplingInterval 180 --dbEnableWriteFromDriver --dbWriteModeDecimals 2 --notSortDataPoints --dpVisualDecimals 2 --mdbReadGroupUpdateInterval 10