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Tips & Tricks / Re: Modbus Addressing

« on: March 15, 2022, 09:54:21 AM »

Some hints when using Modbus with AdvancedHMI.....

The most common addressing is supported such as:

40001
00001
10001

The default are signed integers, but you can force it to use unsigned by preceding the address by a "U". For example:

U40001

32 bit integers and 32 bit floating point are also supported by using the following prefixes:

F40001
L40001

Keep in mind that you are using 4 bytes, so L40001 may overlap L40002. Based on the device you are using. The consecutive 32 bit values may be L40001 and L40003

If you want to force a particular function number, then specify the function followed by a ":". for example:

3:0001


As of version 3.99b, a new prefix is supported for BCD. For example:

B40001

I have problem with addressing my modbus to communicate to Arduino, but only with 32 bit adrresses. "Normal" 16 bit work great, but when I write i.e. L40020 I can write 32 number but it is not send to a Arduino, on any address (40020,40021 or 40022).

I am new to AdvanecedHMI, what am I doing wrong?

I use Modbus RTU that communicate normal with other 16 bit addresses.