Convert decimal to hexadecimal from web browser

[Mikhail]

Hi,
Standard commands expect numeric command result.
To use byte array, change command type to Binary.

[manjey73]

Mikhail, a person wants to drive just a frequency number, but at the same time he needs a command to be added to the byte array that allows changing this frequency. The formula that I have given is working, it is simply necessary to provide a command in the device template to get it. We did this with recording time in several registers.

[manjey73]

Oops, do you have Scada version 5? I don’t know if it’s possible to do this on the 5th version, I haven’t tried it before.

[kcks66]

Hi manjey73,

I am using V5.8.4. Look’s like the result is not the same in both V5 and V6.

Hi Mikhail,

I changed my output channel command type to Binary. That’s great there is no more error message.

However I entered 30 in web browser but the communicator device page show data is unable to be converted (0001 0000)

https://ibb.co/4pxxpQg

https://ibb.co/G7CXqvL

Pls advice and thank you.

• This reply was modified 2 years ago by kcks66.

[manjey73]

For the 5th version, the formula is likely to be different, since you are forced to enter a HEX value.

The 6th version is somewhat more flexible in terms of formula implementations

[manjey73]

When entering the value 30 in binary form, it is entered as a string and BitConverter cannot be applied here.

[kcks66]

Hi Mikhail,

Pls advice for the decimal to hexadecimal conversion issues.

By the way, I have automatic control module installed, could it be used to do the job?

Thank you.

[manjey73]

You would change version 5 to version 6, some things are much simpler there

If I’m not mistaken, on the 5th version in Binary mode, when entering HEX, a byte array is returned, and this should be taken into account in the formula.

[Mikhail]

Hi,

What is written in the device manual about sending that command?
What Modbus function is used to send that command?

[kcks66]

Hi Mikhail,

It is multiple holding register. Example taken from the manual:

https://ibb.co/YXHsvvq

The register address to use is 0002 reference frequency:

https://ibb.co/KWmNJXW

[manjey73]

public double NewFreq()
{
byte[] freq = BitConverter.GetBytes((uint)Cmd*100);
byte[] res = new byte[] { 0x00, 0x01, freq[1], freq[0], 0x00, 0x00, 0x00, 0x00 };
return BitConverter.ToDouble(res, 0);
}

Return the command type to Standard and try the following formula

It may be necessary to play with the location of bytes in the array

byte[] res = new byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x01, freq[1], freq[0] };
But in theory, the first option in the formula should work

[manjey73]

The formula does not cause an error on the 5th version, but always sends 0 for some reason

[kcks66]

Hi manjey73,

Yes, me too. Always get 0.

By the way, thanks for your effort.

[manjey73]

So it’s strange to me that when sending a Cmd command, it is a double, and in theory, returning a double formed from the required bytes, we should send something other than say 30, which we enter. But for some reason nothing happens.

However, if we use Binary, we can send anything in a byte array, but then we need to somehow convert the received value first into a string, then again into the required bytes, etc.

I don’t know if it is available for formulas in the 5th version of the ScadaUtils function to do this.
Via string here (not Hex) I haven’t tried it yet, there you can use the language to form an array according to the idea.

[manjey73]

test

test script

public byte[] NewFreq1()
{
return new byte[] { 0x00, 0x01, CmdData[0], CmdData[1]};
}

Using string input, with the Binary command type, you can accurately convert the entered digits to uint and add them to the block of data being sent.

• This reply was modified 2 years ago by manjey73.
• This reply was modified 2 years ago by manjey73.

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