Setting slave address and baud rate Slave address, baud rate and parity are dependent on the position of a virtual rotary switch and, if applicable, on objects 2028h MODBUS Slave Address, 202Ah MODBUS RTU Baudrate and 202Dh MODBUS RTU Parity. The position of the virtual rotary switch is dependent on the analog value at input ADC_ANALOG_2 (see Pin assignment). Described in the following table is how the position of the virtual rotary switch is composed of the analog value applied at ADC_ANALOG_2 and the voltage divider: Position of the virtual rotary switch Upper limit digit Formula for the voltage divider calculation 0 64 1 128 2 192 3 256 4 320 5 384 6 448 7 512 8 576 9 640 10 704 11 768 12 832 13 896 14 960 15 1023 Note: Observe the following for your voltage divider calculation: If you do not want to use the analog input for setting the address, connect the ADC_ANALOG_2 pin to earth or U_REF_ANALOG. The table shows suggestions for the ratio of the voltage divider; the concrete values of all resistors are to be calculated. U_REF_ANALOG is the reference voltage for the analog input, 3.3 V, see Pin assignment. The current consumption of the voltage divider must not exceed 1 mA. Described in the following is how you define the slave address, baud rate and parity via the virtual rotary switch. Position of the virtual rotary switch Slave address Baud rate and parity 0 Object 2028hh Object 202Ah or 202Dh 1 … 14 Number of the rotary switch Object 202Ah or 202Dh 15 5 19200, even Parity Proceed as follows to define the position of the virtual rotary switch. Calculate the resistances for your voltage divider. You can find an example in the circuit diagram in chapter Connecting Modbus RTU. The reference voltage U_REF_ANALOG (pin B2, see Pin assignment) is 3.3 V DC. Wire input ADC_ANALOG_2 to the voltage divider.
Setting slave address and baud rate Slave address, baud rate and parity are dependent on the position of a virtual rotary switch and, if applicable, on objects 2028h MODBUS Slave Address, 202Ah MODBUS RTU Baudrate and 202Dh MODBUS RTU Parity. The position of the virtual rotary switch is dependent on the analog value at input ADC_ANALOG_2 (see Pin assignment). Described in the following table is how the position of the virtual rotary switch is composed of the analog value applied at ADC_ANALOG_2 and the voltage divider: Position of the virtual rotary switch Upper limit digit Formula for the voltage divider calculation 0 64 1 128 2 192 3 256 4 320 5 384 6 448 7 512 8 576 9 640 10 704 11 768 12 832 13 896 14 960 15 1023 Note: Observe the following for your voltage divider calculation: If you do not want to use the analog input for setting the address, connect the ADC_ANALOG_2 pin to earth or U_REF_ANALOG. The table shows suggestions for the ratio of the voltage divider; the concrete values of all resistors are to be calculated. U_REF_ANALOG is the reference voltage for the analog input, 3.3 V, see Pin assignment. The current consumption of the voltage divider must not exceed 1 mA. Described in the following is how you define the slave address, baud rate and parity via the virtual rotary switch. Position of the virtual rotary switch Slave address Baud rate and parity 0 Object 2028hh Object 202Ah or 202Dh 1 … 14 Number of the rotary switch Object 202Ah or 202Dh 15 5 19200, even Parity Proceed as follows to define the position of the virtual rotary switch. Calculate the resistances for your voltage divider. You can find an example in the circuit diagram in chapter Connecting Modbus RTU. The reference voltage U_REF_ANALOG (pin B2, see Pin assignment) is 3.3 V DC. Wire input ADC_ANALOG_2 to the voltage divider.
