Modbus Transmission Mode (DSC Module or Real-Time Module)
- Updated2023-02-21
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Modbus Transmission Mode (DSC Module or Real-Time Module)
Modbus has the following communications methods that provides different types of master-slave communication:
- Modbus Serial—At any time, only one Modbus master and one or more Modbus slaves are connected to the same serial bus.
- Modbus Ethernet—At any time, one or more Modbus masters and only one Modbus slave are connected on the same Ethernet network.
These communications methods use different data transmission modes: Remote Terminal Unit (RTU), American Standard Code for Information Interchange (ASCII), and Transmission Control Protocol (TCP). The following table describes these transmission modes:
| Transmission Mode | Communications Method | Description |
|---|---|---|
| RTU | Serial | Each message data byte consists of two 4-bit hexadecimal characters. Devices and applications transmit each message in a continuous stream of characters. |
| ASCII | Serial | Each message data byte consists of two ASCII characters. |
| TCP | Ethernet | The Modbus data message is encapsulated in a TCP frame. |
