tanks for feedback. i read through the help file from Cavotec. at first it didnt tell me anything. it was just lika a foreign language.
but i have gotten an example file from our suppliers of Unitronics plc's.
I went through the file up and down back and forth many times. trying to understand the example file
when i then read through the file from Cavotec again i found this :
--------------------------------------
Sub-Index 001
Description Downlink Byte 1
Entry Category Optional
Data Type UNSIGNED8
Access RWW
PDO Mapping Yes
Default Value 0x0
to
Sub-Index 088
Description Downlink Byte 88
Entry Category Optional
Data Type UNSIGNED8
Access RWW
PDO Mapping Yes
Default Value 0x0
-----------------------------------------
the important thing i found here was the line - Data Type UNSIGNED8
that means its just regular numbers i need to send.
i then made a INCREMENT loop and Download STR. and i got it. my display is updating the Subindex i choosen. and goes through the whole list of characters, the dispaly can show.
now ill just divide my MI with 1000, 100 ,10 as Ofir mentioned