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A four character ASCII string (4 typed letters).Here is a spreadsheet for inputs of 4 bytes or 2 words. This is a mathematical formula that allows any real number (a number with decimal points) to represented by 32 bits with an accuracy of about seven digits.
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A 32-bit double precision IEEE floating point number.A 32-bit unsigned integer (a number between 0 and4,294,967,295).Register 40108 could also be combined with 40109 to form any of these 32-bit data types: A discrete on/off value (this works the same as 16-bit integers with a value of 0 or 1.A two character ASCII string (2 typed letters).(hex to decimal conversion that wraps, if its over 32767 then subtract 65536) A 16-bit signed integer (a whole number between -3277).Register 40108 contains AE41 = 44,609 (hex to decimal conversion) A 16-bit unsigned integer (a whole number between 5).
IS MODBUS POLL LIMITED TO ADDRESS 49999 SOFTWARE
The software dictates which format is supported. When entities higher than 9999 are exchanged, the protocol uses 6-digit formatting, so 40001 becomes 400001 49999 becomes 409999. Register 40108 could be defined as any of these 16-bit data types: As the use of Modbus has evolved, manufacturers have started using all 65,535 entities that the protocol supports. The example for FC03 shows that register 40108 contains AE41 which converts to the 16 bits 1010 1110 0100 0001 Great! But what does it mean? Well, it could mean a few things. The difference between these two values is the offset. The DataAddresses are used in the messages.įor example, the first Holding Register, number 40001, has the Data Address 0000.
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Coil/Register NumbersĬoil/Register Numbers can be thought of as location namessince they do not appear in the actual messages. Each register is 1 word = 16 bits = 2 bytes and also has data address between 0000 and 270E. Each coil or contact is 1 bit and assigned a data address between 0000 and 270E. The coils and registers each have a read-only table and read-write table. Two tables store on/off discrete values (coils) and two store numerical values (registers). Information is stored in the Slave device in four different tables.