Fast Communication between Automation and Field Devices: MODBUS
Advantages with MODBUS:
- Uniform data exchange compliant with standards
- Very fast data transmission
- Independent of technology and manufacturer
MODBUS enables connecting a master (e.g., a PC) and several slaves (e.g., measurement and control systems). There are two versions: One for the serial interface (RS-232 and RS-485) and one for ETHERNET.
The following data transmission operating modes are distinguished:
MODBUS RTU establishes a serial master/slave communication via RS-232 or RS-485. In order to address the MODBUS RTU, first the serial communication parameters must be known and/or defined. These parameters include baud rate, parity and stop bits. The slave address(es) to be addressed by the master also come into play. In this case, conductor length with RS-232 is limited to 15 m and with the RS-485, 1200 m.
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