Help with string lengths required

[heron8888 0]

I am scanning labels into a micrologix 1500lrp unit port 1 I need to scan 3 labels, all with different lengths, the first is 6 long, the second 9, and third 12 or possibly variable long, I am using the ard command, and want the first transferred to st15:1, 2nd to st15:2, and 3rd to st15:3, my program works and scans them all but if I set len to 12, it doesent transfer the shorter code due to the dn bit not getting set, any help would be much appreciated

[tip2112 0]

Instead of the ARD instruction,use the ARL and set the length to 0. When the termination character is read (CR by default in the comm channel setup), the DN will set when the termination character is read, regardless of string length.

[heron8888 0]

Thankyou very much for your help, that worked just as required