ModbusRTU/RS-485
What’s Modbus RTU?
Modbus is a communication protocol developed by Modicon Inc. in the United States for exchanging data between industrial devices.
It is used in a wide range of applications, such as controlling factory production lines, robots, and sensors.
Its specifications are publicly available, and anyone can use it free of charge, making it possible to keep implementation costs low.
With the TD-SC1 (485), two types of communication protocols can be selected for use.
- TD Format
- Modbus RTU
| Setting | Format | Default value | Options |
|---|---|---|---|
| Communication Mode | Selection | TD Format (BCC) | TD Format TD Format (BCC) Continuous Transmission Modbus RTU |
| TD Format ID Number | Input | 1 | 1 to 31 |
| Baud Rate | Selection | 115200 | 4800 9600 19200 38400 57600 115200 |
| Bit Length | Selection | 8-bit | 8-bit 7-bit |
| Parity Bit | Selection | None | None Odd Even |
| Stop Bit | Selection | 1-bit | 1-bit 2-bit |
| Delimiter | Selection | CR + LF | CR + LF CR |
| Modbus Device Address |
Selection | 1 | 1 to 247 |
| Modbus communication inactivity time extension |
Selection | 0 | 0 to 30 (ms) |
Communication Mode
-
Select the RS-485 communication protocol.
TD Format：This communication protocol is unique to the TD-SC1.
TD Format (BCC)：This communication protocol adds checksum (BCC) to the TD format.
Continuous ：This continuously transmits TD Format
Transmission：polling command (0001) data.
Modbus RTU:Modbus RTU communication protocol -
TD Format ID Number
This can be set between 1 and 31. Set so it does not overlap with the IDs of other stations. -
Baud Rate
Set the speed for RS-485 communication. -
Bit Length
Set according to the transmission requirements of connected equipment. Set to 8 bit when using Modbus RTU. It will not function if set to 7 bit. -
Parity Bit
Set according to the transmission requirements of connected equipment. -
Stop Bit
Set according to the transmission requirements of connected equipment. -
Delimiter
Set according to the transmission requirements of connected equipment. This is not used with Modbus RTU. -
Modbus RTU Device Address
This can be set between 1 and 247. Set this so it does not overlap with the device addresses of other devices. -
Modbus communication inactivity time extension
This extends the communication inactivity time set by the system according to the normal communication speed.
