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Francesco Viscomi

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07/31/2024 - 07:14

Hi all

I'm new to opc ua world, and when I try to read the documentation as for example:

Name

Data Type

Description

Encoding Mask

Byte

A bit mask that indicates which fields are present in the stream.

The mask has the following bits:

0x01	False if the Value is Null.
0x02	False if the StatusCode is Good.

I'm asking the meaning of =0x01.... 0x02 and so on?

thanks

Randy Armstrong

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08/01/2024 - 21:37

0x1 means it is bit field and the 0x1 is value used to set the bit.

mask |= 0x1;

Francesco Viscomi

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08/02/2024 - 00:51

Sorry for that, could you give more details? please!

the value 0x01 is always 0 🙂 may be x is not for aritmetic operator.

and also the notation mask |= 0x1;

what is the meaning of |

thanks and sorry for not understanding

Randy Armstrong

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08/02/2024 - 11:12

https://en.wikipedia.org/wiki/.....exadecimal

In programming, several notations denote hexadecimal numbers, usually involving a prefix. The prefix

0x

is used in C, which would denote this value as

0x548C

.

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