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If an error occurs in a task, the error code is written to the Modbus register “Modbus_Action_Status_”. For each task there is a register for status and status reset. The Modbus master can perform up to 32 tasks. The configured device does not respond or you use a register address not allowed at the slave (see note above!). The error remains in this register until the Modbus register “Master_Status_Reset” is manually written to the value “1”. If a communication error occurs, the error code is written to the Modbus register “Modbus_Master_Status”.
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The Modbus master has predefined Modbus registers for status messages. Tip!: 32 values are not enough for your project? No problem, just take another master and access the same slave with it.
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If 2 or more slaves have the same address, communication errors occur. Important!If you are using more than one slave, make sure that each slave has its own address.
#Modbus rtu commands how to
For information on how to do this, please refer to the manufacturer’s instruction manual. This address is set directly at your slave.
#Modbus rtu commands serial
The baud rate determines the speed of the serial connection. assignments of Linux device file paths to device serial numbers. This can be prevented by setting udev rules that have e. Important! If you are using multiple devices of the same type, the paths to the Linux device files may change when you reboot. The file path to the Linux device file, default: /dev/ttyRS485. A total of 32 values can be used for each master. This is where you can configure your outputs. This is where you can configure your inputs. In the “Value Editor” we define the settings for the connection:.If you use a lot of devices and want to process the data later in another program, this input can be very helpful. Set the basic settings for your adapters in the “Device Data” window.