Compact Logix 1769-ASCII Card Concatenation

[Drewdin]

I am using a 1769-ASCII card to talk to a Mass Flow Controller, the problem is that I need to send it a string of HEX characters. Initially I was sending a string of '0221ADEF' and I found that the device was not responding. Then i sent a string of '$02$21$AD$EF' and I got the response i was looking for.


There is one packet of data that I need to calculate so I cant manually add the dollar sign to the string, this is where i am having issues.



I am trying to concatenate $ to a string of AD to get $AD dynamically and I cant find anything that works. To get the hex, i am summing decimal values and them converting it to hex. I tried to set the SINT[5] individually but i keep getting SINT[5]=#, SINT[6]=2, SINT[7]=4. What i need is SINT[5]=$.


The issue is that the $ is reserved char. Does anyone have any ideas or suggestions to get me over this hurdle? Thanks

 

[jkerekes]

Did you try two $$? You need to do that to manually enter a $ in a string.

 

[Drewdin]

Did you try two $$? You need to do that to manually enter a $ in a string.

Hi John,

I tried concatenating $$ but it just removes it from the string. I even tried using 4 and a MID to take one out. But it always removes the $ no matter what I have tried.

Thanks

 

[Drewdin]

I ended up using a BTD command to convert from a hex $A9 to decimal and back. Thanks for the help