ASCII to hexadecimal

[Marken]

Hi there,

I am trying to send a hex string to my Profibus card. The string represents a serial number that I read from a file serial.txt. The number has 9 digits which i convert to hexadecimal string.

To be able to write to the Profibus device I need to send a command first to let the network know that I am sending the MSB and so on.

Example:

If I want to write serial umber 111111111 to Profibus I need to follow the following procedure:

Convert d111111111 - 0x69F6BC7

To send the MSB in this case 06 I need to send the following hex sting

1306 0000 0000 0000 for the MSB 

149F 0000 0000 0000 for the MSB - 1 

156B 0000 0000 0000 for the MSB -2  

16C7 0000 0000 0000 for the LSB 

As a procedure I convert the number to a hex integer and then I use the string subset function to select the first byte and then concatenate the string with the write command 0x13. But the function string subset outputs ascii string. How can I subset and then concatenate an hex string?

Please see the attachment.

[GerdW]

Hi Marken,

that should do the trick and is pretty self-explaining (once you use the context help)

[Marken]

Hi GerdW,

Very kind of you to replay so quick, thank you.

I have implemented your suggested method and I am very impressed works fine for sending the hex stings.

I have selected the first element of the 1D array of string and try to send it to my Master Profibus function but creates a conflict.

As you see in the diagram the cluster sent to the Master vi has the slave address which always will be 1 so I can hard wire a constant plus the hex string of 1306 for example.

How can I convert the 1D string array to the unsigned byte array ?

Thanks again for your time please see the attachment.

Kind Regards

Marken

[Marken]

Hi GerdW,

Very kind of you to replay so quick, thank you.

I have implemented your suggested method and I am very impressed works fine for sending the hex stings.

I have selected the first element of the 1D array of string and try to send it to my Master Profibus function but creates a conflict.

As you see in the diagram the cluster sent to the Master vi has the slave address which always will be 1 so I can hard wire a constant plus the hex string of 1306 for example.

How can I convert the 1D string array to the unsigned byte array ?

Thanks again for your time please see the attachment.

Kind Regards

Marken

[GerdW · Accepted solution]

Hi Marken,

my FOR loop creates an Array of Strings (4 Strings for each byte of the U32 value). You have to index the string you want to process, then you can convert the string to [U8]...